Blowing fuse no. 74

2008 FORD F-550
245,000 MILES • 6.4L • V8 • 2WD • AUTOMATIC
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JEFF RITT
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Blowing fuse no.74. Have high pres fuel pump cover, no chaffing of wires or short to ground when solenoids on HPFP are disconnected there is no shorts
Aug 24, 2016 at 12:03 PM
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HMAC300
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this fuse goes to a bunch of things, it's an engine harness check to see if it's rubbed through on frame or engine it's grn/wht wire goes to mass air flow , accelerator pedal as well as glow pulg module. have it scanned for codes to see if anything gets picked up
Aug 24, 2016 at 4:10 PM
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JEFF RITT
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When I unplug four wire connector to HPFP, the fuse stays intact. It is when I plug four wire connector together the fuse blows. This is why I think it is in one of the components on HPFP.
Aug 24, 2016 at 8:44 PM
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HMAC300
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the the pump is probably drawing to many amps or a short in that wiring
Aug 25, 2016 at 5:27 AM