Main faults of the fuel pump:
- failure or incorrect operation of the fuel level indicator sensor;
- clogged or damaged fuel pump filter;
- failure of the electric pump;
- failure of the pressure regulator.
In most cases, malfunction of the fuel level sensor is caused by contamination or oxidation of its contact group.
You will need: a flat-blade screwdriver, pliers.
1. Disconnect the drain pipe from the pump module housing by prying it off with a screwdriver.
2. Overcoming the force of the spring, move the module body slightly up the guides and, using a screwdriver, remove the retaining ring from one of the guides. After this, the module body can be moved slightly away from the bracket.
3. Disconnect the ground wire from the fuel pressure regulator.
4. Use a screwdriver to press the wiring harness connector lock…
5. …and disconnect it from the intermediate block.
6. Disconnect the wiring harness connector from the electric pump.
7. Release the two fasteners 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, then wipe with a lint-free cloth soaked in alcohol.
10. Using a screwdriver, pry up the spring retainer of the fuel pressure regulator…
11. …remove the retainer from the bracket…
12. …and remove the regulator.
13. Inspect the pressure regulator O-rings. Replace rings that are too tightly compressed, hardened or torn by removing them using a screwdriver.
Note: Lubricate the fuel pressure regulator O-rings with a thin layer of grease or engine oil before installation.
14. Press down 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 body, overcoming the resistance of the spring lock washer.
18. Before reinstalling the filter, remove the lock washer, straighten it with pliers and install it into the filter housing.
19. Install the filter in the reverse order of removal.
20. To replace the electric pump, press the plastic retainer…
21. …and remove the electric pump from the housing.
22. Assemble the fuel pump in the reverse order of disassembly.