Question about 1992 Volvo 940

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How will I know if my fuel filter, pump or both are bad?

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Fuel system pressure testing usually will reveal the answer to that question. If your car has the Regina system it will have one pump in the tank. If the pump fails, the car will not start. If the fuel filter is partially blocked, the car usually will start but will lack power and have poor fuel mileage. For the Bosch system, which has two pumps, read on.

If your car has the Bosch system then it will have two pumps. One pump is under the driver seat and the other is in the tank. The pump under the driver seat is the main pump; if it fails, the car will not run. If the tank pump fails, the car will run but the main pump will be very noisy. Additionally, the car generally will bog down making right turns as the fuel sloshes around in the tank without the rear pump working when it's under a half tank of fuel.

The easiest way to tell if your car has the Bosch system is if you have a MAF (Mass Air Flow meter) connected to the air intake plumbing with a six way connector coming out of it and your ignition coil is a traditional-looking can-shaped unit bolted to the passenger side strut tower.


The easiest way to tell if your car has the Regina system is by looking at the ignition coil - it will be square and bolted to the driver's side strut tower near the intake air filter. Also, the intake air filter will have a two-wire harness connected a temperature sensor at the air box instead of the MAF.

Posted on Apr 07, 2014

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