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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 pump power issues

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Old Jul 2, 2024 | 07:37 PM
  #1  
WolfMann's Avatar
WolfMann
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Mountain Pass
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fuel pump power issues

1990 f150 4.9 dual tanks
fuel pumps not priming with key, 8v at pump with diagnostic test pin jumpered, any thoughts?
 
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Old Jul 2, 2024 | 07:44 PM
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NotEnoughTrucks2014's Avatar
NotEnoughTrucks2014
Fleet Mechanic
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From: Saskatchewan Canada
Fuel pump relay, fuel tank selector, inertia switch, fuel pump and every connection in between. Get yourself a wiring diagram and look for the voltage drop.
 
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Old Jul 2, 2024 | 08:38 PM
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Soup bean
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https://www.ford-trucks.com/forums/1...age-issue.html
 
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Old Jul 2, 2024 | 10:26 PM
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WolfMann
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thanks guys
 
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Old Jul 3, 2024 | 01:54 PM
  #5  
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WolfMann
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Got it figured out, bad fuel selector switch. Here's a couple diagrams for the next guy. Thanks again.

Ground for system



 
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