Ford Truck Enthusiasts Forums

Notices
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 pumps problems

Thread Tools
 
Search this Thread
 
Old Mar 22, 2008 | 08:34 PM
Share
  #1  
JJAPHIPPS22's Avatar
JJAPHIPPS22
Thread Starter
|
Freshman User
Joined: Feb 2008
Posts: 27
Likes: 0
Fuel pumps problems
Fuel Pumps run continuesly with key on engine off, and truck wont start.
(91 F-150 5.0) Where should I start.
 
Reply
0
Old Mar 22, 2008 | 09:04 PM
Share
  #2  
quicklook2's Avatar
quicklook2
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
Originally Posted by JJAPHIPPS22
Fuel Pumps run continuesly with key on engine off, and truck wont start.
(91 F-150 5.0) Where should I start.
classic sign of bad computer.
 
Reply
0
Old Mar 22, 2008 | 10:07 PM
Share
  #3  
Animalistic's Avatar
Animalistic
Elder User
Joined: Dec 2006
Posts: 550
Likes: 1
From: Hillsboro, OR
Originally Posted by quicklook2
classic sign of bad computer.
Either that or the relay is stuck closed. I am not too sure on these models but I have seen relays weld themselfs closed in other applications. Something to check?
 
Reply
0
Old Mar 23, 2008 | 08:50 AM
Share
  #4  
stevcher's Avatar
stevcher
Junior User
Joined: Dec 2005
Posts: 94
Likes: 0
From: upstate NNY WATERTOWN
fuel pump problems
Try changing fuel filter first.Cheap and easy.They will get clogged and not allow
system to reach pressure to shut down.Had same problem with 92 and changed filter.Good luck.
 
Reply
0
Old Mar 23, 2008 | 09:23 AM
Share
  #5  
EPNCSU2006's Avatar
EPNCSU2006
Lead Driver
20 Year Member
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
The 2-second operation of the fuel pump at initial key-on is independent of fuel pressure, so a clogged fuel filter will not cause the pumps to run continuously with the key on. There's actually no fuel pressure sensor at all on these year trucks.
 
Reply
0
Old Mar 24, 2008 | 09:40 AM
Share
  #6  
JJAPHIPPS22's Avatar
JJAPHIPPS22
Thread Starter
|
Freshman User
Joined: Feb 2008
Posts: 27
Likes: 0
I am going try the fuel pump relay first, then look into the computer. Also with key on engine off I am getting continues spark could this also be part of the problem.
 
Reply
0
Old Mar 24, 2008 | 10:34 AM
Share
  #7  
quicklook2's Avatar
quicklook2
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
try the relay but it will be the computer.
 
Reply
0

Trending Topics

Old Mar 24, 2008 | 10:48 AM
Share
  #8  
JJAPHIPPS22's Avatar
JJAPHIPPS22
Thread Starter
|
Freshman User
Joined: Feb 2008
Posts: 27
Likes: 0
Originally Posted by quicklook2
try the relay but it will be the computer.
Not trying to offend here, But why do you feel so confident it's the computer?
 
Reply
0
FTE Stories

Ford Trucks for Ford Truck Enthusiasts

story-0

This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

 Verdad Gallardo
story-1

Top 10 Fords at 2026 Carlisle Ford Nationals

 Joe Kucinski
story-2

3 Best / 3 Worst Parts of Modern Ford Ownership

 Brett Foote
story-3

10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

 Pouria Savadkouei
story-4

Every 2026 Ford Engine Explained

 Brett Foote
story-5

10 Ugly Ford Trucks That We Still Kinda Love

 Joe Kucinski
story-6

10 Things Every Truck Owner NEEDS (2026 Edition)

 Michael S. Palmer
story-7

Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

 Verdad Gallardo
story-8

Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

 Joe Kucinski
story-9

2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

 Brett Foote
Old Mar 24, 2008 | 11:17 AM
Share
  #9  
quicklook2's Avatar
quicklook2
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
because it is a classic sign of what happens when one goes bad.

another member has a long post about similar problem and he tried everything and it was the computer.

i will find a link for you.

here it is:

https://www.ford-trucks.com/forums/7...ml#post5729854

look at some of his earlier posts to find the original discussion of his problem.
 
Reply
0
Old Mar 24, 2008 | 12:51 PM
Share
  #10  
Bad92Nite302's Avatar
Bad92Nite302
New User
Joined: Mar 2008
Posts: 22
Likes: 0
hmm *scratches head* that may be the problem with this Nite then... It was the 3rd fuel pump the guy put into it...
 
Reply
0
Old Mar 24, 2008 | 04:38 PM
Share
  #11  
EPNCSU2006's Avatar
EPNCSU2006
Lead Driver
20 Year Member
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
While it may be the computer, it's still good practice to troubleshoot the rest of the system before throwing in a relatively expensive computer.
 
Reply
0
Old Mar 24, 2008 | 05:24 PM
Share
  #12  
Virto's Avatar
Virto
Posting Guru
Joined: Jun 2007
Posts: 1,394
Likes: 0
From: Des Plaines, Illinois
No reason not to check the relay, but like QL says, its most often the ECC.
 
Reply
0
Old Mar 24, 2008 | 05:55 PM
Share
  #13  
quicklook2's Avatar
quicklook2
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
always a good idea to trouble shoot all possible problems.

i hope it is something simpler, or cheaper than the computer.
 
Reply
0
Old Mar 24, 2008 | 07:09 PM
Share
  #14  
albung's Avatar
albung
Senior User
Joined: Apr 2006
Posts: 447
Likes: 0
From: youngstown ohio
so what ur saying is the truck runs even with key off??? I only say that cause u say it still sparks, and that would sound like ign switch or the rods goin to it
 
Reply
0
Old Mar 24, 2008 | 08:04 PM
Share
  #15  
quicklook2's Avatar
quicklook2
Post Fiend
Joined: May 2004
Posts: 11,289
Likes: 6
From: Lakewood, Ohio
key on.

engine off.

is what he said.
 
Reply
0



Advanced Search
Reply Closed Thread Share
Forum Jump

All times are GMT -5. The time now is 07:09 AM.

story-0
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level

Slideshow: The VelociRaptor Expedition gains a lift, upgraded suspension, Brembo brakes, and trail-ready equipment while retaining the stock 440-horsepower EcoBoost V6.

By Verdad Gallardo | 2026-06-12 11:01:55


VIEW MORE
story-1
Top 10 Fords at 2026 Carlisle Ford Nationals

Slideshow: Top 10 Fords at 2026 Ford Nationals

By Joe Kucinski | 2026-06-09 11:10:08


VIEW MORE
story-2
3 Best / 3 Worst Parts of Modern Ford Ownership

Based on years of owning multiple modern Ford products.

By Brett Foote | 2026-06-09 10:53:36


VIEW MORE
story-3
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches

SPONSORED: From muddy boots to rain-soaked cargo, these upgrades address some of the most common frustrations Ford truck owners face every day.

By Pouria Savadkouei | 2026-06-08 18:50:34


VIEW MORE
story-4
Every 2026 Ford Engine Explained

Here's everything you need to know about every Ford engine available for the 2026 model year.

By Brett Foote | 2026-06-05 12:58:01


VIEW MORE
story-5
10 Ugly Ford Trucks That We Still Kinda Love

Slideshow: 10 ugly Ford trucks that we still kinda love.

By Joe Kucinski | 2026-06-03 09:51:16


VIEW MORE
story-6
10 Things Every Truck Owner NEEDS (2026 Edition)

Slideshow: the best gifts for dads & grads

By Michael S. Palmer | 2026-06-03 15:43:58


VIEW MORE
story-7
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath

Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.

By Verdad Gallardo | 2026-06-03 11:38:36


VIEW MORE
story-8
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer

Slideshow: 10 most expensive Ford trucks ever sold on Bring a Trailer.

By Joe Kucinski | 2026-05-27 16:24:34


VIEW MORE
story-9
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)

Here's everything that has changed for the latest model year.

By Brett Foote | 2026-05-27 16:17:28


VIEW MORE