Question about 1994 Volvo 850

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1993 Volvo 850 fuel issues

I have a 1993 Volvo 850 Glt. I turn the key to get it started and it doesn't fire up. The engine cranks and when it doesn't crank I hear it wind. I've gone under and hit the gas tank with my hand and 3/10 times that is enough to get it started. It's becoming harder and harder. It also Idles fast or slow. Is it a pump issue or pump relay. It starts up right after I turn it off, but if I let it sit for awhile it won't.

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  • jaddis01 Nov 24, 2008

    Now what if I don't hear the humming from the pump when I turn the key on without cranking it. Is it still the pump? For about a month before it quit...If I turned the key on for radio...I could hear a loud hmmmm. Almost like power antenna going up. Now nothing



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It is the fuel pump for sure. If you can hit the tank and get it to run it is the pump. this drain back (hard start after sitting) is a fuel pump issue as well

Posted on Nov 24, 2008

  • Mike Holmes Nov 25, 2008

    if you hear a hum under the car then the fuel pump is running, however if it will not start right away it can still be the pump, it could have a fuel drain back condition in which the fuel pumps internal check valve allows the fuel pressure to drain back into the tank instead of retaining it in the fuel rail at the injectors. if you dont hear the pump at all but you did before, it may be the pump or the relay, but looking at your previous symptoms , i would lean strongly to it being the pump. the way to test it is , find the wire harness leading to the pump, in the harness will be several wires. check for voltage on the thicker pink or purple wire while someone cranks the engine. If voltage is there WHILE CRANKING, it is the pump, if voltage is not there it is the relay. The fuel pump can be accessed thru the floor on the back of the car, in the wagon it is below and slightly behind the right rear seat, in the sedan it is under the trunk carpet



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Sorry to bear bad tidings if this is so.
Paul 'W'
Onyer~EDson(:0) {#><U.K.
Please remember to politely rate my effort!

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