Front tank fuel pump issue
Thread Starter
|
Senior User
Joined: Nov 2014
Posts: 104
Likes: 0
From: Upper Michigan
Front tank fuel pump issue
Front tank pump quit working while I was running on it. Rear tank is working fine. Assumed pump failed in front tank. Dropped tank and replaced pump assembly. Before installing in tank I plugged it in to test it, turned key on and had no pump activity. Then jumped 2 and 6 at self test turned key on and still no pump activation on front tank. So at this time I am leading towards possibly a bad fuel tank switch for front tank? Anybody experience the switch to go bad for one tank? Any advice would be appreciated. Harness connection/pins/wires at the tank look clean at first inspection. Thanks for your time.
New User
Joined: Sep 2016
Posts: 14
Likes: 0
88 ford
Hi im new to this and was wondering if someone could help me/lead me in the right way. I ran a pos. & neg. wire from the battery straight to the fuel pump and the pump is working but the truck still won't start any ideas and thanks in advance
Thread Starter
|
Senior User
Joined: Nov 2014
Posts: 104
Likes: 0
From: Upper Michigan
Still no start after replacing fuel tank selector switch. Time to take a harder look at the harness and connections. What should the voltage be going to the pump assembly? Thanks.
Trending Topics
Thread Starter
|
Senior User
Joined: Nov 2014
Posts: 104
Likes: 0
From: Upper Michigan
Can anyone provide a testing procedure to troubleshoot no power to front tank fuel pump knowing that the fuel pump, the fuel pump relay and the selector switch do work. I have done a little surfing but have not been able to find anything related to a dual tank system for a 96 F250 with a 5.8L. Found some info for earlier year models like 92 and 93. Part 1 -1993 Fuel Pump Circuit Tests (Ford 4.9L, 5.0L, 5.8L) Thanks.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Just ground pin #6 of the self-test plug.
Turn on the key.
Use a loading test light and start working your way from where in the circuit you have power to where you do not.
This diagram should be close to what you have:
/
Turn on the key.
Use a loading test light and start working your way from where in the circuit you have power to where you do not.
This diagram should be close to what you have:
/
Fleet Owner
Joined: Aug 2005
Posts: 23,667
Likes: 301
From: Easton,Ks
Shorting 2 to 6 will ground pin #6 OK if the PCM Computer is plugged in and you have a good ground from pin #6 to the PCM Computer and then on to the body ground on the passenger fender and the body ground has a good ground to the NEG (-) post of the battery.
Grounding pin #6 to a good ground location will close the fuel pump relay to run the fuel pumps also with the key on. But will not check the ground path from Pin #6 to the PCM and to the NEG post of the battery.
Note the small black wire with a white stripe in the photo below at the body ground is the PCM Computer ground wire to PCM pins 40 & 60.
/
Grounding pin #6 to a good ground location will close the fuel pump relay to run the fuel pumps also with the key on. But will not check the ground path from Pin #6 to the PCM and to the NEG post of the battery.
Note the small black wire with a white stripe in the photo below at the body ground is the PCM Computer ground wire to PCM pins 40 & 60.
/
Thread Starter
|
Senior User
Joined: Nov 2014
Posts: 104
Likes: 0
From: Upper Michigan
Found the problem. Red wire is power to front tank. Brown/white wire is power to rear tank. Rear tank was still working but not for long. Damage was done about six inches from where this harness plugs into the firewall obviously rubbing on something. It will be nice to have two tanks again. Thanks for the help again Subford. Once I figured out the diagram it was a piece of cake.
Thread
Thread Starter
Forum
Replies
Last Post
RJL1
1987 - 1996 F150 & Larger F-Series Trucks
7
Jan 31, 2017 06:59 PM
dickiefrank
1987 - 1996 F150 & Larger F-Series Trucks
2
Jan 9, 2015 04:45 AM
old blue 90
1987 - 1996 F150 & Larger F-Series Trucks
7
Nov 29, 2009 11:03 AM
old blue 90
1987 - 1996 F150 & Larger F-Series Trucks
5
Jul 4, 2009 03:19 PM
websthes
1987 - 1996 F150 & Larger F-Series Trucks
7
Sep 25, 2007 12:07 PM