linderpat

for the first time, I can now hear my fuel pump hum. Not real loud, like they do when you are low on gas, but a low level hum. Does this mean it is about to die? I haven't noticed it before.

Herman K

When did you last check your internal pump it could be that a piece of the rubber hose found it's way to the external pump.

You can inspect the internal pump and after you remove the external pump submerge it in a light weight oil (or cooking oil for that matter) reverse the flow for a few minutes by (reversing the wires +/-) using a 12 volt power source (other than the car) and see if it clears up than put the wire back to the normal position and check if the sound has changed.

I did this some years ago I bought another pump for back-up but the original pump still works.

Best H

robot808

Ed, it is certainly not a good sign. I believe that my last fuel pump lasted for about a year with that hum though.

dcrasta

My pump has a low level high frequency 'whine' This is normal.

A hum that is 'loud' is usually a sign of restriction in the intake (in take pump maybe?)

I would follow the suggested procedures and see if the 'hum' goes away, however I have always been able to hear the pump if I stand on the rear right (passengerside) as the 928 (86>) pumps are actually outside .

WallyP

If any part of the pump or its hoses touch the body, the hum will be louder than normal.

linderpat

Thanks folks. Looks like a good winter project.