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kck-drum kck-drum is offline
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Join Date: Oct 2021
Posts: 15
1986 951 Fuel Pump Problem

Does anyone have any idea what is wrong with my car?
listen to the fuel pump.
https://www.youtube.com/watch?v=BBSFXkS282I

It doesn't like to accelerate under full throttle.
It happened all of the sudden. One day when I went to take off it stuttered and struggled to accelerate. When I came to a stop I could hear the fuel pump whining.

I did no further diagnosis and just assumed... "I need a new fuel pump"
So, I put in a new pump. The new pump whines too. The car still doesn't accelerate properly.
I put in a new fuel filter. No change.
I checked the fuel strainer. It is clean.

When I start the car from cold the pump sounds normal. I drive around for 10 minutes and it starts to whine.

I checked the voltage at the terminals on the pump while it was making the weird whining noise. It was about 12.3 volts.

Any ideas?
Old 10-04-2021, 02:00 PM
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