The main malfunctions of the fuel pump:
- failure or incorrect operation of the fuel gauge sensor;
- clogging or damage to the fuel filter of the pump;
- failure of the electric pump;
- failure of the pressure regulator.
In most cases, the malfunction of the fuel level sensor is caused by contamination or oxidation of its contact group.
You will need: flat blade screwdriver, pliers.
1. Disconnect the drain tube from the pump module housing by prying it off with a screwdriver.
2. Overcoming the force of the spring, slightly move the module body up along the guides and, prying it with a screwdriver, remove the retaining ring from one of the guides. After that, the module housing can be moved slightly away from the bracket.
3. Detach the handpiece «mass» wires from the fuel pressure regulator.
4. Press the retainer of the wiring harness block with a screwdriver..
5.... and disconnect it from the intermediate block.
6. Disconnect the wiring harness block from the electric pump.
7. Unclench the two clamps of the fuel level sensor and, moving it up along the grooves of the fuel pump housing..
8.... remove the sensor from the housing.
9. Wash the sensor rheostat contacts and its slider plate with gasoline, and then wipe with a lint-free cloth soaked in alcohol.
10. Prying off the spring retainer of the fuel pressure regulator with a screwdriver..
11.... remove the retainer from the bracket..
12.... and remove the regulator.
13. Inspect pressure regulator o-rings. Replace heavily compressed, hardened or torn rings by removing them by prying them with a screwdriver.
Note. Lubricate the fuel pressure regulator O-rings with a thin layer of grease or engine oil before installing.
14. Squeeze out the plastic clips..
15.... and remove the lower part of the fuel pump housing from the bracket guides.
16. To replace or clean the fuel filter, pry its base with a pointed tool..
17.... and remove the filter from the pump housing, overcoming the resistance of the spring lock washer.
18. Before reinstalling the filter, remove the lock washer, straighten it with pliers and install it in the filter housing.
19. Install the filter in the reverse order of removal.
20. To replace the electric pump, wring out the plastic retainer..
21.... and remove the electric pump from the housing.
22. Assemble the fuel pump in the reverse order of disassembly.