Procedures of replacing an electric fuel pump:
1. Disconnect the ground terminal at the battery.
2. Disconnect the electrical connectors on the electric fuel pump. Label the wires to help in connecting it to the new pump. Reversing polarity on most pumps destroy the unit.
3. Fuel and vapor lines should really be removed from the pump. Label the lines to help in connecting them to the new pump.
four. The inside tank pump can generally be taken out of the tank by removing the fuel sending unit retaining or lock ring. Having said that, it may possibly be vital to remove the fuel tank to get at the retaining ring. Removal of the fuel tank can be achieved as described earlier in this chapter.
five. On a fuel pump that is outside the tank, take away the bolts holding it in spot. On in- electrical slip rings , loosen the retaining ring. Pull the pump and sending unit out of the tank (if they are combined in 1 unit) and discard the tank O-ring seal.
six. To take away the pump, twist off the filter sock, then push the pump up until the bottom is clear of the bracket. Swing the pump out to the side and pull it down to cost-free it from the rubber fuel line coupler. slip ring in between the bottom of the pump and bracket and the rubber coupler on the fuel line are commonly discarded mainly because new ones are integrated with t he replacement pump. Some pumps have a rubber jacket about them to quiet the pump. If this is the case, slip off the jacket and place it on the new pump.
7. Examine the replacement pump with the old 1. If essential, transfer any fuel line fittings from the old pump to the new one particular. Note the position of the filter sock on the pump so you can install a new one in the similar relative position.
eight. When inserting the new pump back into the sending unit bracket, be cautious not to bend the bracket. Make sure the rubber sound insulator beneath the bottom of the pump is in location. Install a new filter sock on the pump inlet and reconnect the pump wires. Be PCB slip ring have right polarity. Replace the O-ring seal on the fuel tank opening, then put the pump and sender assembly back in the tank and tighten the locking ring by rotating it clockwise. Some pump/sender assembly units are secured by bolts.
9. If the fuel was removed from the car, replace it.
10. Reconnect the electrical connectors.
11. Reconnect the ground terminal at the battery.
12. Commence the engine and check all connections for fuel leaks.
Warning: Stay away from the temptation to test the new pump prior to reinstalling the fuel tank, by energizing it with a couple of jumper wires. Running the pump dry can harm it since the pump relies on fuel for lubrication and cooling.