Question about 1990 Volvo 740

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Need a schematc diagram of the electrical wiring sysdtem and fuel schematic diagram for volvo 740gl

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  • hotcars101 Sep 10, 2008

    need a schematic for fuel pump circuit. I have no power feeding fuel pump ( recently replaced fuel pump ) any help ?

  • hotcars101 Sep 10, 2008

    replaced fuel pump and still have a no start situation, no power coming to the pump with key on and in start position. good fuses, think I could use a wirin diagram

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Www.ipdusa.com sells the correct shop manual for the car. It is only available in the British publication, so you will need to look up metric conversion formulas, which are quite easy. I have this book, so you know.

Posted on Oct 02, 2008

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I own a 1989 740GL.The engine is the standard "


Wait - you said it has no spark, and then started asking about fuel injector relays. I am confused.
When you crank the engine, do the spark plugs spark? If not, the most likely problem is the trigger mechanism. The '89 740 used a sensor in the bell housing detecting flywheel position. This car is about due for its third sensor as the insulation on those things tends to degrade and need replacement every decade or so. If you are still on your original sensor, you have been very lucky to make it this far.
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Sounds like it could be vapor locking. Especially if it starts after it gets cool. Try adding a can of octane booster to the fuel next time you fill up and see if that helps.

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