JPH11173229A - Fuel vapor line system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the intrusion of the rain water or the like into a valve operatable corresponding to the pressure, by mounting the valve operatable corresponding to the pressure for exhausting the fuel vapor and absorbing the outside air, on a lower part of a floor panel of a car body, and opening an air opening hole in a cross member at a front side of the car body through an air communicating path. SOLUTION: This fuel vapor line system 5 mounted on a position located at a lower part of an engine room, of a floor panel of a car body comprises a closed two-way valve 6 and an internal pressure sensor 7. On this occasion, a connection port 27 of the two-way valve 6 is connected with a connection port 53 of a fuel tank 11 through a connection pipe 52, and an air opening hole 23 is opened in a cross member at a front side of the car body through a atmospheric tube 50 and a canister filter 10. Further, a drain port 28 of the internal pressure sensor 7 is opened in the cross member at the front side of the car body through a drain tube 30, the two-way valve 6, the atmospheric tube 50 and the canister filter 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel vapor line for discharging fuel vapor generated from a fuel tank of a vehicle to the outside and sucking outside air into the fuel tank as the internal pressure of the fuel tank decreases. About the system.

[0002]

2. Description of the Related Art Conventionally, in a one-box car, since the volume of an engine room is small, a two-way valve (pressure responsive valve), an internal pressure sensor (pressure sensor), a canister and A canister filter and the like are provided below the floor panel of the vehicle body.

[0003] When the components of the fuel vapor line system are below the floor panel of the vehicle body, the components may be submerged by rainwater splashed up by the front wheels during traveling. In particular, if there is a protrusion such as a trunk or a fuel tank below the floor, the rainwater or the like accumulates on the front wall thereof, and the 2-way valve and the internal pressure sensor are submerged.

The two-way valve and the internal pressure sensor among the constituent elements have an opening to the atmosphere, and the two-way valve and the internal pressure sensor are submerged by the splashed rainwater or the like. In some cases, rainwater or the like may enter the inside of the two-way valve or the internal pressure sensor through the air opening hole, causing a functional failure.

Conventionally, in order to prevent this, the atmosphere opening hole of the two-way valve is covered with a water-repellent cover, so that rainwater or the like flows from the atmosphere opening hole to the inside of the two-way valve or the atmosphere opening hole of the internal pressure sensor. There was something to prevent infiltration.

However, in this case, since it is necessary to separately provide a water-prevention cover, the configuration is complicated, the workability is poor, and the cost is disadvantageous.

For this reason, conventionally, a body frame structure closing member (a hat portion of a substantially L-shaped member) is used as a water-repellent cover (Japanese Utility Model Laid-Open No. 6-39547), or an air opening hole of a two-way valve. That communicates with the atmosphere through a narrowly bent passage (Japanese Patent Application Laid-Open No. 9-151822).
No.).

[0008]

However, in the case where the above-mentioned conventional body frame structure closing member is used as a water-repellent cover, since the body frame structure closing member is located behind the front wheel, this body frame structure closing member is not used. Because the water itself is submerged by splashes on the front wheels, the function as a water-repellent cover becomes unstable, and it is not possible to reliably prevent rainwater or the like from entering the interior of the two-way valve from the air opening hole. There was a point.

In the conventional two-way valve described above, in which the air opening hole is communicated with the atmosphere through a narrowly bent passage, the structure of the bent passage becomes complicated, the cost increases, and a large amount of the passage is formed. There was a problem that it was not possible to reliably prevent infiltration of rainwater or the like.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to provide a pressure-responsive valve (two-way valve), a pressure sensor (internal pressure sensor), and the like. Even if it is necessary to provide a cover below the floor panel behind the front wheels, it is possible to prevent rainwater etc. It is an object of the present invention to provide a fuel vapor line system capable of reliably preventing the occurrence of a fuel vapor.

[0011]

According to a first aspect of the present invention, there is provided a fuel vapor line system for discharging fuel vapor to the outside as the internal pressure of the fuel tank increases, and for controlling the internal pressure of the fuel tank. In a fuel vapor line system in which a pressure responsive valve for sucking outside air into the fuel tank in accordance with a decrease in pressure is provided below a floor panel of the vehicle body, the atmosphere opening hole of the pressure responsive valve is connected to the vehicle body through an atmosphere communication passage. Characterized in that it is opened in the front cross member.

[0012] In order to achieve the above object, the present invention provides a second aspect.
The fuel vapor line system according to claim 1, wherein a pressure sensor for detecting a leak of the fuel vapor line based on a difference between an internal pressure of a fuel tank and an outside air pressure is provided below a floor panel of a vehicle body. The air release hole is opened through the air communication passage into the front cross member of the vehicle body.

[0013] In order to achieve the above object, a third aspect is provided.
The fuel vapor line system according to claim 1, further comprising: a pressure-responsive valve for discharging fuel vapor outward with an increase in the internal pressure of the fuel tank and sucking outside air into the fuel tank with a decrease in the internal pressure of the fuel tank. In a fuel vapor line system provided below a floor panel of a vehicle body, an atmosphere opening hole of the pressure responsive valve is opened above a floor panel on a front side of the vehicle body via an atmosphere communication passage.

[0014] In order to achieve the above object, the present invention is directed to claim 4.
The fuel vapor line system according to claim 1, wherein a pressure sensor for detecting a leak of the fuel vapor line based on a difference between an internal pressure of a fuel tank and an outside air pressure is provided below a floor panel of a vehicle body. Is opened above the floor panel on the front side of the vehicle body through an atmosphere communication passage.

[0015] In order to achieve the above object, the present invention provides a fifth aspect.
5. The fuel vapor line system according to claim 1, wherein the air vent hole of the pressure sensor is provided below a floor panel of a vehicle body via an atmosphere communication path in the fuel vapor line system according to claim 1. Connected to an atmosphere opening hole of a pressure-responsive valve for discharging fuel vapor to the outside with an increase in the internal pressure of the fuel tank and sucking outside air into the fuel tank with a decrease in the internal pressure of the fuel tank. I do.

Further, in order to achieve the above object, the present invention provides a method according to the present invention.
The fuel vapor line system according to claim 1, wherein, in the fuel vapor line system according to claim 1, a fuel vapor generated in the fuel tank through an atmosphere opening hole of the pressure responsive valve through an atmosphere communication path. The canister is connected to a canister to be adsorbed and is connected to a canister filter provided in front of the vehicle body, and an atmosphere communication passage of the canister is opened in a cross member on a front side of the vehicle body.

That is, the air release hole of the pressure responsive valve or the air release hole of the pressure sensor is opened through the atmosphere communication passage in the cross member on the front side of the vehicle body or above the floor panel on the front side of the vehicle body. Accordingly, the cross member on the front side of the vehicle body or the floor panel on the front side of the vehicle body is located near the front wheel and is not affected by rainwater or the like jumped up by the front wheel during traveling. Even if the sensor is submerged by rainwater or the like jumped up by the front wheels during traveling, rainwater or the like does not enter the pressure-responsive valve or the pressure sensor from the air opening hole.

Further, since the atmosphere opening hole of the pressure sensor is connected to the atmosphere opening hole of the pressure responsive valve via the atmosphere communication path, the atmosphere communication path can be shortened and the piping structure can be simplified.

Further, the atmosphere opening hole of the pressure responsive valve is connected to the canister filter via the atmosphere communication passage, and the atmosphere communication passage of the canister filter is opened in the cross member on the front side of the vehicle body. Can be shortened, and the piping structure can be simplified.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, the first embodiment of the present invention will be described.
An embodiment will be described with reference to FIGS.

FIG. 1 is a longitudinal sectional view of a main part of a vehicle body provided with a fuel vapor line system according to a first embodiment of the present invention, and FIG. 2 is a fuel vapor line according to the first embodiment of the present invention. FIG. 3 is a perspective view showing the configuration of the system, and FIG.
1 is a schematic vertical sectional view showing a configuration of a fuel vapor line system according to an embodiment.

In FIG. 1, reference numeral 1 denotes a vehicle body of a one-box car, and in FIG. 1, a left side is a vehicle body front portion (front side). 2 is a floor panel of the vehicle body 1 and 3 is a floor panel 2
Is a spare tire storage concave portion provided in the vehicle. The upper part of the floor panel 2 located in front of the spare tire storage recess 3 is an engine room 4.
An engine (not shown) and the like are stored therein. A fuel vapor line system 5 of the present invention is provided in a portion of the floor panel 2 located below the engine room 4.

As shown in FIGS. 2 and 3, this fuel vapor line system 5 is a closed type two-way valve (pressure responsive valve) 6, an internal pressure sensor (pressure sensor) 7, a bypass solenoid (BPS) 8, a canister 9, a canister filter 10 and a fuel tank 11 are provided.

The two-way valve 6 is a valve for discharging fuel vapor to the outside as the internal pressure of the fuel tank 11 increases and for sucking outside air into the fuel tank 11 as the internal pressure of the fuel tank 11 decreases. is there. 2 way valve 6
As shown in FIG. 3, a valve housing 12 and two valve bodies 13 and 1 provided in the valve housing 12 are provided.
And 4. Inside the valve housing 12,
Three chambers 15, 16, 17 are provided. The first chamber 15 is located above the inside of the valve housing 12 and the second chamber 1
Reference numeral 6 denotes a third chamber 1 at the inner center side of the valve housing 12.
Reference numeral 7 denotes an inner peripheral side of the valve housing 12 (the second chamber 16).
Are located on the outer peripheral side. The first room 15
The second chamber 16 and the third chamber 17 via the first valve 13
And each is isolated. Also, the second chamber 16 and the third chamber 16
The upper communication port 18 with the chamber 17 is opened and closed by the first valve body 13. The lower communication port 19 between the second chamber 16 and the third chamber 17 is opened and closed by the second valve element 14.

The first valve body 13 is made of a diaphragm, and is pressed by a spring 20 in a direction to close the upper communication port 18 (downward in FIG. 3). Then, the opening of the first valve body 13 is determined according to the difference between the internal pressure of the first chamber 15 and the internal pressure of the second and third chambers 16 and 17. The second valve element 14 is formed of a disk-shaped member, and is pressed by a spring 21 in a direction to close the lower communication port 19 (upward in FIG. 3). Then, the opening of the second valve body 14 is determined according to the difference between the internal pressure of the second chamber 16 and the internal pressure of the third chamber 17.

The upper surface of the valve housing 12 is provided with two open-to-atmosphere holes 22 and 23 which open to the first chamber 15. Further, two connection ports 24 and 25 that open to the second chamber 16 are provided on the side surface of the valve housing 12. Further, two connection ports 26 and 27 that open to the third chamber 17 are provided on the side surface of the valve housing 12.

The internal pressure sensor 7 detects a paper line leak by detecting the difference between the internal pressure of the fuel tank 11 and the outside air pressure during normal running, and detects a leak of the fuel tank 11 and the canister 9 during a leak check. The configuration is conventionally known, and has a drain port (open to the atmosphere) 28 and a pressure flow port 29. The drain port 28 is connected to one air opening port 22 of the two-way valve 6 via a drain tube (connection pipe) 30. The pressure flow port 29 is connected to the third connection port 26 of the two-way valve 6 via the connection pipe 31. That is, the internal pressure sensor 7 is always connected to the drain tube 3.
0 and communicates with the outside air (atmosphere), and also communicates with the inside of the fuel tank 11 through the connection pipe 3 and the two-way valve 6.

The bypass solenoid 8 is opened at the time of a leak check (at the time of a leak check of the fuel tank 11 and at the time of a leak check of the canister 9) to allow the internal pressure sensor 7 to detect the presence or absence of a leak, and is constituted by an electromagnetic valve. ing. Valve housing 3 of bypass solenoid 8
Inside 2, a first chamber 33 and a second chamber 34 are provided. The first chamber 33 is located on the inner center side of the valve housing 32, and the second chamber 34 is located on the outer peripheral side of the valve housing 32 (outer peripheral side of the first chamber 33). One end 33a of the first chamber 33 is connected to the valve housing 32.
And the other end 33b is connected to the valve housing 3
2 open to the second chamber 34. The opening surface of the other end 33 b of the first chamber 33 is opened and closed by a valve 35. The valve body 35 is opened and closed by an electromagnetic solenoid 36 provided above the inside of the valve housing 32. Normally, the valve body 35 is attached downward by a spring 37 so as to close the opening surface of the other end 33b. It is being rushed. Further, the second chamber 3 is provided on the outer peripheral wall surface of the valve housing 32.
A connection port 38 that opens into the inside 4 is provided. And
One end 33a of the first chamber 33 of the bypass solenoid 8 is
The connection pipe 39 is connected to the first connection port 24 of the two-way valve 6. Also, the bypass solenoid 8
Are connected to the third connection port 26 of the two-way valve 6 and the pressure flow port 29 of the internal pressure sensor 7 via the connection pipe 31.

The canister 9 adsorbs fuel vapor generated in the fuel tank 11, and has three connection ports 40,
41 and 42 are provided.

The canister filter 10 filters the exhaust gas discharged from the canister 9 and discharges it to the atmosphere. The canister filter 10 has two connection ports 43 and 44 and an atmosphere opening hole 45.
have.

The first connection port 40 of the canister 9 is connected to the second connection port 25 of the two-way valve 6 via a connection pipe 46, and the second connection port 41 is connected to the canister filter 10 via a connection pipe 47. Is connected to the second connection port 44. The second connection port 41 of the canister 9 is an on-off valve (VSSV: valve canister vent shut) 4
It is opened and closed by 1a. The third connection port 42 of the canister 9 is connected to a connection pipe 48 and a purge amount control valve (PC
S) is connected to an engine (not shown) via 49. The purge amount control valve 49 is an on / off valve. By the on (opening) operation, fuel vapor accumulated in the canister 9 is sent to the engine side so that an appropriate fuel mixture ratio is obtained. It has become.

Also, the first of the canister filters 10
The connection port 43 is connected to the other air opening hole 23 of the two-way valve 6 via an atmospheric tube (connection pipe) 50. Canister filter 10
The air opening hole 45 is opened in the cross member 51 on the front side of the vehicle body as shown in FIG.

The fourth connection port 2 of the two-way valve 6
7 is connected to a connection port 53 of the fuel tank 11 via a connection pipe 52.

The open-to-atmosphere hole 23 of the two-way valve 6 is connected to the cross member 5 on the front side of the vehicle body through the atmospheric tube 50 and the canister filter 10.
1 is open. A drain port 28, which is an atmosphere opening hole of the internal pressure sensor 7, is opened through a drain tube 30, a two-way valve 6, an atmospheric tube 50, and a canister filter 10 into a cross member 51 on the front side of the vehicle body. .

Next, the operation of the fuel vapor line system 5 according to the present embodiment having the above configuration will be described.

When the leak check is not performed, the valve body 35 of the bypass solenoid 8 always closes the opening surface of the other end 336 and is in a closed state. In this state, if the internal pressure of the fuel tank 11 is at a predetermined value, the first and second valve bodies 13 and 14 of the two-way valve 6 are both closed and the fuel tank 11 and the two-way valve 6 are closed. Third
, The pressure flow port 29 of the internal pressure sensor 7, the connection pipe 31, and the system path of the second chamber 34 of the leak check valve 8. From this state, when the internal pressure of the fuel tank 11 increases to a predetermined value or more, the first valve element 13 of the two-way valve 6 opens against the urging force of the spring 20, and the fuel inside the fuel tank 11 is opened. The steam is supplied to the connection port 5 of the fuel tank 11.
3, the connection pipe 52, the fourth connection port 27 of the two-way valve 6, the third chamber 17, the second chamber 16, the second connection port 2.
5. Accumulated (adsorbed) in the canister 9 via the connection pipes 46, 40. When the internal pressure of the fuel tank 11 reaches a predetermined value, the first valve element 1 of the two-way valve 6
The valve 3 is closed by the urging force of the spring 20, and the outflow of the fuel vapor from the fuel tank 11 is stopped.

On the other hand, when the internal pressure of the fuel tank 11 falls below a predetermined value due to a decrease in the internal pressure of the fuel tank 11, the first valve body 13 of the two-way valve 6 closes and the second
Is opened against the urging force of the spring 21, the canister filter 10, the atmospheric tube 5
0, the first chamber 15 of the two-way valve 6, the drain tube 30, the internal pressure sensor 7, and the third chamber 1 of the two-way valve 6
7. Outside air is introduced into the fuel tank 11 through the connection pipe 52. When the internal pressure of the fuel tank 11 rises to a predetermined value with the introduction of the outside air, the second valve element 14 of the two-way valve 6 closes due to the urging force of the spring 21 and enters the fuel tank 11. External air introduction stops.

As described above, the fuel vapor is discharged to the outside as the internal pressure of the fuel tank 11 increases, and the outside air is introduced into the fuel tank 11 as the internal pressure of the fuel tank 11 decreases. The internal pressure of the fuel tank 11 is automatically maintained at an appropriate value.

The fuel vapor accumulated (adsorbed) in the canister 9 is turned on (opened) by the purge amount control valve 49 in response to the negative pressure on the engine side so that an appropriate fuel mixture ratio is obtained. Is sent to the engine side and burned.

When performing a leak check of the fuel tank 11, the on-off valve 41a of the canister 9 is closed,
After opening the valve body 35 of the bypass solenoid 8, the engine is operated. If the internal pressure sensor 7 detects a negative pressure in this state, the line system of the fuel tank 11 has no leak and is normal, and if the internal pressure sensor 7 detects a positive pressure, the line system of the fuel tank 11 has a leak and is abnormal. Therefore, a leak check of the line system of the fuel tank 11 is performed.

When a leak check of the canister 9 is performed, the on-off valve 41a of the canister 9 is closed,
After opening the valve body 35 of the bypass solenoid 8, the engine is operated. In this state, when the valve 35 of the bypass solenoid 8 is closed and then opened again, if the detected pressure of the internal pressure sensor 7 changes, there is no leak in the line system of the canister 9 and the internal pressure sensor is normal. If the detected pressure of 7 does not change, it is determined that there is a leak in the line system of the canister 9 and it is abnormal, and a leak check of the line system of the canister 9 is performed.

By the way, in the fuel vapor line system 5 according to the present embodiment, the atmosphere opening holes 22 and 23 of the two-way valve 6 and the atmosphere opening hole 28 of the internal pressure sensor 7.
Is opened in the cross member 51 on the front side of the vehicle body, and the cross member 51 is located near the front wheel and is not affected by rainwater or the like jumped up by the front wheel during traveling. Therefore, the two-way valve 6 or Even if the internal pressure sensor 7 is submerged by rainwater or the like jumped up by the front wheels during traveling, rainwater or the like may enter the two-way valve 6 from the atmosphere opening holes 22 and 23 or into the interior pressure sensor 7 from the atmosphere opening hole 28. Do not penetrate.

(Second Embodiment) In the first embodiment described above, the air opening hole 45 of the canister filter 10 is opened in the cross member 51 on the front side of the vehicle body, but is not limited to this. However, as shown in FIG.
5 may be opened above the floor panel 2 on the front side of the vehicle body through the inside of the cross member 51 on the front side of the vehicle body.

Also in the fuel vapor line system 5 according to the present embodiment, the two-way valve 6 has
23 and an air opening hole 28 of the internal pressure sensor 7 are opened above the floor panel 2 on the front side of the vehicle body through the inside of the cross member 51 on the front side of the vehicle body, and the floor panel 2 on the front side of the vehicle body is a front wheel. It is located in the vicinity and is not affected by rainwater or the like jumped up by the front wheels during running. Therefore, even if the two-way valve 6 or the internal pressure sensor 7 is submerged by rainwater or the like jumped up by the front wheels during running,
From the atmosphere opening holes 22 and 23 to the inside of the two-way valve 6,
Alternatively, rainwater or the like does not enter the inside of the internal pressure sensor 7 from the atmosphere opening hole 28.

[0046]

As described in detail above, claims 1 to 5 of the present invention are described below.
According to the fuel vapor line system described in Item 4, the air release hole of the pressure responsive valve or the air release hole of the pressure sensor is connected to the inside of the cross member on the front side of the vehicle body or the floor panel on the front side of the vehicle body via the air communication passage. By opening upward, the cross member on the front side of the vehicle body or the floor panel on the front side of the vehicle body is located near the front wheel, and is not affected by rainwater or the like jumped up by the front wheel during traveling. Even if the response valve or the pressure sensor is submerged by rainwater or the like jumped up by a front wheel during traveling, an effect that rainwater or the like does not enter the pressure response valve or the pressure sensor from the atmosphere opening hole is exerted. .

According to the fuel vapor line system according to the fifth and sixth aspects of the present invention, the atmosphere opening hole of the pressure sensor or the atmosphere opening hole of the pressure responsive valve is connected to the floor of the vehicle body through the atmosphere communication passage. Since it is connected to the atmosphere opening hole of the pressure responsive valve provided below the panel or connected to the canister filter, the atmosphere communication path can be shortened and the piping structure is simplified.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a main part configuration of a vehicle body provided with a fuel vapor line system according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a fuel vapor line system according to the first embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing a configuration of a fuel vapor line system according to the first embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing a main configuration of a vehicle body provided with a fuel vapor line system according to a second embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Body 2 Floor panel 3 Spare tire storage recess 4 Engine room 5 Fuel vapor line system 6 2 Way valve (pressure responsive valve) 7 Internal pressure sensor (pressure sensor) 8 Bypass solenoid (BPS) 9 Canister 10 Canister filter 11 Fuel tank 12 Valve Housing 13 Valve 14 Valve 15 Chamber 16 Chamber 17 Chamber 18 Upper communication port 19 Lower communication port 20 Spring 21 Spring 22 Open air hole 23 Open air hole 24 Connection port 25 Connection port 26 Connection port 27 Connection port 28 Drain port (Connection Port) 29 pressure flow port 30 drain tube (connection pipe) 31 connection pipe 32 valve housing 33 chamber 33a one end 33b other end 34 second chamber 35 valve body 36 electromagnetic solenoid 37 spring 38 connection port 39 connection pipe 40 connection port 41 connection Port 41a On-off valve (VSSV: valve canister vent shut) 42 Connection port 43 Connection port 44 Connection port 45 Atmospheric release hole 46 Connection pipe 47 Connection pipe 48 Connection pipe 49 Purge control valve (PCS) 50 Atmospheric tube (Connection pipe) 51 Cross member 52 Connection pipe 53 Connection port

Claims (6)

[Claims] 1. A pressure-responsive valve for discharging fuel vapor to the outside with an increase in the internal pressure of a fuel tank and for sucking outside air into the fuel tank with a decrease in the internal pressure of the fuel tank is provided on a floor of a vehicle body. A fuel vapor line system provided below a panel, wherein an atmosphere opening hole of the pressure responsive valve is opened in a cross member on a front side of a vehicle body through an atmosphere communication passage. 2. A fuel vapor line system in which a pressure sensor for detecting a leak of a fuel vapor line based on a difference between an internal pressure of a fuel tank and an outside air pressure is provided below a floor panel of a vehicle body. A fuel vapor line system characterized in that holes are opened in a cross member on the front side of a vehicle body through an atmosphere communication passage. 3. A pressure responsive valve for discharging fuel vapor to the outside with an increase in the internal pressure of the fuel tank and sucking outside air into the fuel tank with a decrease in the internal pressure of the fuel tank is provided on a floor of the vehicle body. A fuel vapor line system provided below a panel, wherein an atmosphere opening hole of the pressure responsive valve is opened above a floor panel on a front side of a vehicle body via an atmosphere communication passage. 4. A fuel vapor line system in which a pressure sensor for detecting a leak of a fuel vapor line based on a difference between an internal pressure of a fuel tank and an outside air pressure is provided below a floor panel of a vehicle body. A fuel vapor line system characterized in that the hole is opened above a floor panel on the front side of the vehicle body through an atmosphere communication passage. 5. An atmosphere opening hole of the pressure sensor is provided below a floor panel of a vehicle body via an atmosphere communication path, and discharges fuel vapor to the outside with an increase in the internal pressure of the fuel tank. 4. A pressure-responsive valve connected to an atmosphere opening hole of a pressure-responsive valve for sucking outside air into the fuel tank as the internal pressure of the tank decreases.
Or the fuel vapor line system according to 4. 6. An atmosphere opening hole of the pressure responsive valve is connected to a canister that adsorbs fuel vapor generated in the fuel tank through an atmosphere communication passage, and is connected to a canister filter provided in front of the vehicle body. The air communication passage of the canister is opened in a cross member on the front side of the vehicle body.
The fuel vapor line system as described.