1991 Jeep Cherokee Fuel Pump?

Question

I've been noticing an intermittent loud "hum" from the rear of the vehicle, but the operation of the vehicle seemed unaffected. Yesterday, the vehicle would not start. It would crank, but wouldn't start. This was accompanied by the aforementioned "hum" from the rear of the Jeep. Later on the Jeep did start, but I'm wondering if a faulty fuel pump is the cause of the noise and the inability to start the vehicle.

If so, does replacing the pump require removal of the fuel tank? Any tips on doing this? It seems like a total pain in the rump and anything that would make it easier would be appreciated. Thanks!

Note: I have another Jeep Cherokee that does not make the "humming" noise.

Answer 1

ive changed many jeep fuel pumps. and have noticed that most chrysler products have funny sounding pumps. you need to take a fuel pressure reading before you do anything. these pumps are known for clipping in and out. ive replaced two in my 93 cherokee . the pump is in the tank. and my advice to you is dont fill the tank before you change it

Answer 2

that hum you hear is your electric fuel pump in the tank. if it is humming its pumping. its suppose to hum til it pumps up then you have a fuel regulator valve that dispurses the fuel to the injectors. i would look more in that area for your problem. disconnect the gas hose at the engine turn the key on see if it is pumping fuel. thats easy enough.

Answer 3

ther hum is the working fuel pump, when one gioes bad it makes no sound at all, change your fuel filters first before anything else

Answer 4

that pump ought to come on momentarily before you crank the engine and proceed to be operating so long because the engine is operating. that pump continues to be on so long because the cpu sees a tach signal of more advantageous than four hundred rpm.