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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Fuel system issue

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Old Aug 2, 2025 | 02:37 PM
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flareside hunter's Avatar
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Fuel system issue

Hey guys, not sure who still pops in and out of this forum but I’m looking for some help. I got a 93 f150, just recently did a fuel pump and all went nicely, truck fired up well and ran good for about 25 minutes. Got back home shut it off, went to fire it up again a few hours later and absolutely nothing. No fuel to the rail, pump won’t prime or kick in at all. I checked the fuse, checks at battery voltage. Checked inertia switch, not popped and again checks battery voltage at the wire. I figured it may be an untimely broken wire along the frame, wrong. Battery voltage to the power wire at pump, both ground wires seem good no breaks, and signal wire reads 5 volts like it should (as far as I’m told anyways). Here’s the real kicker, I jump power to the pump via terminals underneath, we have engagement and fuel. Possible chance the pump is just faulty and fried itself after the initial ride? Any other ideas would be awesome, I’m all ears.
 
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Old Aug 2, 2025 | 04:38 PM
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jas88
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You may have enough voltage at the power wire at the pump to light your test light, but not enough to run the pump. Check fuel pump relay.
 
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