Perhaps I'm old school, well I know I am @ 76 working on a '91 Volvo 940 SE!! ! But every parts store I go to with my old Bosch Fuel Accumulator comes up with a Fuel filter using the Bosch part #? It looks the same but are the guts the same? Even one parts store counter-guy who used to work in the Volvo Dealer parts deportment here in town says the parts guys there call them filters also. That makes no sense as I have read that the accumulator has a spring diaphragm that acts to maintain resting pressure when the engine is off. I've never heard of it having any filtering capabilities. I'm replacing the main FP so figured while I was there I'd do the accumulator too. Any old timers out there have the facts on this? I'm about to cut my old accumulator in half just to see what's inside! TD

 

I believe fuel accumulators were only used in Bosch K-Jet fuel systems.

 

Your 91 electronic injected Volvo has a fuel filter mounted next to the main pump. The check valve on the exit of the pump, and the fuel pressure regulator maintain rest pressure.

If you had a K-jetronic (or I call them CIS injection) car as pictured in the lower parts page - you would have an accumulator that stores pressure as well as a check valve on the exit of the pump. The fuel filter was mounted under the hood in those cars. The CIS cars ran with a much higher fuel pressure - (about 90psi? if I remember correctly)