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Fuel pumps problems

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Old Mar 22, 2008 | 08:34 PM
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JJAPHIPPS22
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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.
 
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Old Mar 22, 2008 | 09:04 PM
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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.
 
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Old Mar 22, 2008 | 10:07 PM
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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?
 
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Old Mar 23, 2008 | 08:50 AM
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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.
 
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Old Mar 23, 2008 | 09:23 AM
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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.
 
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Old Mar 24, 2008 | 09:40 AM
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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.
 
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Old Mar 24, 2008 | 10:34 AM
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try the relay but it will be the computer.
 
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Old Mar 24, 2008 | 10:48 AM
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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?
 
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Old Mar 24, 2008 | 11:17 AM
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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.
 
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Old Mar 24, 2008 | 12:51 PM
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hmm *scratches head* that may be the problem with this Nite then... It was the 3rd fuel pump the guy put into it...
 
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Old Mar 24, 2008 | 04:38 PM
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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.
 
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Old Mar 24, 2008 | 05:24 PM
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No reason not to check the relay, but like QL says, its most often the ECC.
 
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Old Mar 24, 2008 | 05:55 PM
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always a good idea to trouble shoot all possible problems.

i hope it is something simpler, or cheaper than the computer.
 
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Old Mar 24, 2008 | 07:09 PM
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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
 
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Old Mar 24, 2008 | 08:04 PM
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key on.

engine off.

is what he said.
 
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