Question about 1991 Volvo 740

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Fuel system or electrical short in fuel system

Car wont start or shuts down while driving.fuel pump temporarily shuts down.

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  • wingbone Jul 09, 2008

    sounds like pigeons in my gas tanks. flipped transfer switch and the van died.

  • bpattys Jul 25, 2008

    My '91 740 (with Regina/REX) systems has failed to start. It will start w/ether and run, but stops when the ether is gone. I have replaced the fuel pump (later bench test says it was good) fuel relay, filter, plugs, air filter. Can't get a test code that tells me anything. Highly suspect the fuel pressure is too low. Suspect either the RPM sensor, or pressure regulator or both. Ideas, help.

    Thanks Bud

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My 92 740 regina would crank sometimes and sometimes would not. I reached behind the engine and felt a cable (crankshaft sensor). It had exposed wire and cuts. This fixed the problem. I also have to clean the positive terminal connectors on the battery. One of them, if not clean, will cause it not to crank. I don't know about the pressure regulator. I have not messed with the pressure regulator. You can pull the fuel line going to the fuel rail off. It is a rubber fuel hose. Attach a clear tube and run it into a empty bottle. Attempt to crank. The bottle should get fuel in it. I can't remember how much it is suppose to get. It will tell you if you are getting fuel to the rail.

Posted on Aug 22, 2008

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