Fuel pump gasket not sealing

SUPERBRIK · Post by **SUPERBRIK** » 28 Nov 2021, 13:43

I am having an issue after replacing the fuel pump in my ‘05 S80 (T5 auto, FWD). I am thinking of adding a thin gasket to the fuel pump so the pressure ring will have a better seal.. and stop sucking air around the seal.
Anyone have experience with this issue?

Post by **RickHaleParker** » 28 Nov 2021, 22:33

Are the threads to the locking ring clean and nothing to keep the ring elevated?
A drop of soap on the threads so you can torque the rings good.

SUPERBRIK · Post by **SUPERBRIK** » 30 Nov 2021, 04:38

I am using anti-seize on the threads, have made sure the fuel pump is pressed equally and centered; have the remover tool; cleaned the channel of the regular gasket; and have tried the old and new aftermarket gaskets.. I recently got a gasket from Volvo directly and will try that.. nothing seems to work to make a full seal..

Post by **RickHaleParker** » 30 Nov 2021, 07:18

SUPERBRIK wrote: 30 Nov 2021, 04:38 I recently got a gasket from Volvo directly and will try that.. nothing seems to work to make a full seal.

Hold back on "nothing seems to work" until you try the Volvo gasket.
I can see now both old and aftermarket gaskets might not seal.

Some of the cheap aftermarket gaskets are cheap because they skip on the details .. like temperature coefficients. Some try to mold the gasket the finial size not taking into account shrinkage after the part cools. That is the problem with copying parts using the plug molding method. Most materials shrink when they phase change from a liquid to a solid.

SUPERBRIK · Post by **SUPERBRIK** » 03 Dec 2021, 01:27

I will be trying the new gasket in the car this weekend.. the new one is from Volvo, the aftermarket one I am not sure.. maybe by Bosch ?

SUPERBRIK · Post by **SUPERBRIK** » 07 Sep 2022, 18:48

Forgot to update on this.. Volvo and Bosch seals were identical.. what sounded to be an air leak/no seal situation was actually a starving fuel pump due to the FPS (fuel pressure sensor) that was errant and had been replaced.. changed out the FPS, and problem was solved!
Thank you all for your replies!!