My 90 Oldsmobile will run and start putting and getting ready to die on me constantly. The person who sold me the car told me that I was going to need a fuel pump pretty soon so I'm almost 80-90% sure that's the problem. But the thing is that I don't know whether or not the fuel pump is in the gas tank or not. What should I do?
Fig. 1: The electric fuel pump has an in-tank design
Disconnect wiring from the tank.
Remove the ground wire retaining screw from under the body.
Disconnect all hoses from the tank.
Support the tank on a jack and remove the retaining strap nuts.
Lower the tank and remove it.
the position of the filter for replacement. Support the pump with one
hand and grasp the filter with the other. Rotate the filter in one
direction, then pull off of the pump. Discard the filter.
Disconnect the fuel pump connector, on wagons it will not be necessary.
On all models excluding wagons:
the sending unit on a bench upside down, then pull the fuel pump
downwards to remove from the mounting bracket. Tilt the pump outwards
and remove from the pulsator.
On wagons proceed as follows:
Disconnect the negative terminal nut and lead (black) from the pump.
Disconnect the positive lead (gray) from the pump, then loosen the coupler clamps.
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take the intake tube off the throttle body and spray your starting fluid in there. if it starts then dies, its your fuel pump. it could also be the pump relay, or inertia switch, aka emergency shut-off switch
sometimes the tank decomposes from the inside flaking off and clogging filters, pumps, etc. always a good idea to completly remove tank and flush to check for same when changing the fuel pump. if that's your problem, you will need a new gas tank
if it has a distributor, check to see if it has power when you turn the key to the on position. theres a couple of wires back there, i think its three. one of them should be supplied with 12v when you turn the key, the same goes if its only two wires, one needs to be powered. without power to the distributor, no power "distributed" to spark plugs.