Breather Line And Suction Line Inspection

Breather Line and Suction Line Inspection

Special Tools Required

- Fuel Pressure Gauge Attachment Set 07AAJ-S6MA150
- Vacuum Pump/Gauge, 0-30 inHg Snap-on YA4000A or equivalent, commercially available
- Vacuum/Pressure Gauge, 0-4 inHg 07JAZ-001000B

1. Remove the center console Service and Repair.

2. Remove the parking brake lever, then remove the access panel from the floor Fuel Tank Unit Removal/Installation.

3. Disconnect the suction line (A) from the fuel tank unit, and connect a vacuum pump/gauge, 0-30 in Hg (B), to the hose as shown.





4. Start the engine, and check the vacuum:

- If there is vacuum, go to step 5.
- If there is no vacuum, replace the fuel filter Service and Repair.

5. Turn the ignition switch to LOCK (0).

6. Attach the fuel pressure gauge attachment. Then connect the vacuum pump/gauge (A) to the suction line (B), and apply vacuum to the line:

- If the line holds vacuum, check for a blockage in the suction line. If there is a blockage, replace the suction line.
- If the line does not hold vacuum, go to step 7.





7. Raise the vehicle on a lift Service and Repair.

8. Remove the fuel tank mount bracket (A).






9. Disconnect the breather line (A). Attach the fuel pressure gauge attachment, then plug the suction line (B) with a rubber cap (C).






10. Attach the fuel pressure gauge attachment. Then connect the vacuum pump/gauge (A) to the suction line (B), and apply vacuum to the line:

- If the line holds vacuum, check for a blockage in the suction line and the fuel tank vapor recirculation tube. If there is a blockage, replace the fuel tank Removal and Replacement. If the fuel tank vapor recirculation tube is OK, replace the suction line.
- If the line does not hold vacuum, go to step 11.





11. Raise the vehicle on a lift Service and Repair.

12. Connect a T-fitting (A), a vacuum gauge, and the vacuum pump/gauge (B) to the filler side of the breather line (C) as shown. Then apply pressure to the line:

- If the pressure holds, check for a blockage between the suction line and the filler neck on the breather pipe, then replace the part that is causing the blockage.
- If the pressure does not hold, go to step 13.





13. Remove the rubber cap from the suction line, and reconnect the breather pipe to the suction line.

14. Attach the fuel pressure gauge attachment. Then connect the T-fitting (A), the vacuum gauge, and the vacuum pump/gauge (B) to the suction line (C) as shown. then apply pressure to the line:

- If the pressure holds, the breather line and the suction line are OK.
- If the pressure does not hold, check for a vacuum leak in the suction line, and replace the suction line if needed.