Question about 1993 Volvo 940
Fuel pump runs when bench tested
has power only when when cranking cannot hear pump running in tank
tried used relay no different
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Posted on Jan 02, 2017
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Nov 27, 2012 | 1994 Volvo 940
Aug 17, 2012 | 1994 Volvo 940
If the main fuel pump doesn't begin running when jumped (you should definitely hear it humming), you either have a faulty fuel pump or faulty wiring to the pump (bad wiring is really common under an old 240, near the pump). This test of course assumes your battery is good.
If one of the fuses blows during this test, the pump circuit wiring is shorting to ground somewhere between the fuse panel and the pump.
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