Breather Line and Suction Line Inspection
Special Tools Required
Image Description/Tool Number
310189.png Fuel Pressure Gauge Attachment Set 07AAJ-S6MA150
310284.png Vacuum Pump/Gauge, 0?30 inHg Snap-on YA4000A or equivalent, commercially available
2. Access Panel - Remove
1.
Disconnect the connector (A).
2.
Remove the access panel (A) from the floor.

3. Breather Line and Suction Line - Inspect
1.
Disconnect the quick-connect fitting (A) from the fuel tank unit, and connect a vacuum pump/gauge, 0?30 inHg, to the fuel tank unit as shown.
2.
Start the engine, and check the vacuum.
If there is vacuum, go to step 3.
If there is no vacuum, replace the fuel filter.
3.
Turn the vehicle to the OFF (LOCK) mode.
4.
Connect a vacuum pump/gauge, 0?30 inHg, to the suction line (A) with the joint in the fuel pressure gauge set, and apply vacuum to the line.
5.
Raise the vehicle on the lift.
8.
Disconnect the quick-connect fitting (A) from breather line, then plug the suction line with the joint in the fuel pressure gauge set and a rubber cap (B).
9.
Lower the vehicle.
10.
Connect a vacuum pump/gauge, 0?30 inHg, to the suction line (A) with the joint in the fuel pressure gauge set, and apply vacuum to the line.
If the line holds vacuum, check for a blockage in the breather line between the fuel tank and the suction joint. If there is blockage, replace the fuel tank.
If the line does not hold vacuum, go to next step.
11.
Raise the vehicle on the lift.
12.
Connect a vacuum pump/gauge, 0?30 inHg, to the fuel fill pipe side breather line (A), and apply air pressure to the line.
If the air pressure holds, or a blockage between the suction line and the fuel fill neck on the breather pipe, and replace the part that is causing the blockage.
If the air pressure does not hold, go to next step.
NOTE: When check for the one way valve tube (B), remove it, then connect a vacuum pump/gauge, 0?30 inHg, with the joint in the fuel pressure gauge set, and apply vacuum or air pressure by one direction to the valve as shown.

Pressure
Hold
Not hold
Vacuum
NG
OK
Pressurization
OK
NG
13.
Remove the joint and the rubber cap (C) from the suction line (D), and reconnect the quick-connect fitting.
16.
Lower the vehicle.
17.
Connect a vacuum pump/gauge, 0?30 inHg, to the suction line (A) with the joint in the fuel pressure gauge set, and apply pressure to the line.
If the air pressure holds, the breather line and the suction line are OK.
If the air pressure does not hold, check for a vacuum leak in the suction line, and replace the suction line if needed.


4. Access Panel - Install
1.
Install the access panel (A).
2.
Connect the connector (A).