Replacing a 94 Buick fuel pump with an outboard electric pump
Is it possible to replace a shot 94 Buick pump with an outboard electric pump. I realize the feed line will need to be cut, and the pump wiring changed, but will the old pump left in the tank interfere with fuel flow?
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Could be anything electrical. A weak relay, the coil pack or ignition module, and so on.
You'll need to figure out what is loosing electrical power when it fails to start to know what to test. You might start with the fuel pump relay.
this is typically a problem with the fuel level sensor that is integral
to the fuel pump, in the tank. the only way to repair this issue is to
remove the fuel tank and replace the pump. this is a common issue on
GM's. the level sensor is a potentiometer, and with wear and tear the
"wiper" electrical contact just wears out. you can also try having the
vehicle scanned for codes, to eliminate the possibility of another
electrical / computer problem (unlikely). good luck!
You must remove the fuel tank in order to replace the fuel pump. Drain the tank of as much fuel as possible with a hand pump. Disconnect the positive + battery cable. Disconnect the fuel lines and the electrical connections. Remove the fuel tank, and then remove the old pump. Clean off any old gasket and then reinstall the new pump. Reinstall the tank and then replace the fuel filter. A partially clogged fuel filter will cause a pump to fail prematurely.
A couple of possibilities. 1st, check to see that the fuel pump is working. When you turn the key to on position (not all the way to crank the engine over), can you hear the pump? You should hear a humming sound from the gas tank . The fuel in the tank actually keeps the fuel pump from overheating. It is possible the pump is shot. It would be a good idea to change the fuel filter, as it may be plugged up from sediment from the bottom of the tank.
Drain all gas as much as possible for weight reasons, Unhook fuel lines, unhook electrical connections, and ground connections, filler tube, and straps, then tank will drop out. Remove retaining ring on sending unit remove unit from tank taking note how it comes out because its got to go back in the same way it came out, chg. pump on sending unit there is one electrical plug, reinstall unit in tank with retaining ring, assemble in reverse order.