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Fuel delivery problems

Help, Advice, Owners' Discussion and DIY Tutorials on all Volvo's "mid era" rear wheel drive Volvos.

1975 - 1993 240
1983 - 1992 740
1982 - 1991 760
1986 - 1991 780
1990 - 1998 940
1990 - 1998 960
1997 - 1998 V90/S90

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Year and Model: 1992 940
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Volvo Repair Database Fuel delivery problems

Post by urbanjunkyardcamo940 » Fri Nov 15, 2019 2:42 pm

I am having trouble with my 92 940, it has no fuel pressure but otherwise fine. in all of the videos/googled information I have found they all have the primary pump under the driver's seat on the underbody. I have a European model (I believe, as labels in the car say made in Ireland and I have an oem rear foglight.) and the only underbody part of the fuel system was a Bosch fuel filter, which still had gas in it. The car will run for a few seconds if I spray carb cleaner through the air box, but I have 0psi of fuel pressure both at the rail and the fuel filter connection. My in-tank pump has 7 volts going to it, but that pump got replaced a couple of years ago, and as of today the car has been sitting for around 1 year 3 months. Any help?

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Year and Model: 760 1988
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Re: Fuel delivery problems

Post by lummert » Sat Nov 16, 2019 10:14 am

Diagnose problem with in-tank fuel pump. Do you know if the pump is even running. Have you tried to bypass the fuel pump relay to trigger the pump? If the pump is running perhaps the fuel hose connecting the pump to the tank sending unit has rotted causing the fuel to just fall back into the tank.

The pump connecting hose requires submersible type hose.
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1988 Volvo 760 Turbo Wagon

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