Question about 1991 Ford F150

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Where is the fuel pump relay switch located on ' 91 ford f-150

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There is a relay for the fuel pump beside the air filter on my 91 f150 4x4 4.9L i6 300 I am having having problems with fuel pump also. hope this helps!

Posted on Jul 20, 2010

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Posted on Jan 02, 2017

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Location of fuel pump relay on '89 f 150 4.9


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1 Answer

2005 ford f 150 fule pump relay location


The Fuel pump relay is built into the CJB ( aka Central Junction Box, cab fuse panel ), and is not serviceable.
If this is a case of the fuel pump is not working ( and you have checked the fuel inertia switch ), next is usually the Fuel pump driver module.
This is located on the cross member towards the front of the truck by the spare tire ( need to lower the spare tire to see it ).
The 1st design was mounted too tight to the cross member, and if any corrosion started to build up behind it, it would push on it from behind and crack it.
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Did you have any work done on the fuel injectors ?

Jan 18, 2010 | 2005 Ford F-150

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Fuel pump


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Pump relay


The relay is located on the cab on the drivers side. Locate the fuel pump inertia switch up against the firewall.
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Same problem with my 85 F-150 5.0 EFI---turned out that the fuel pump relay under the hood was teriffically corroded on the inside (I opened up the relay to look inside). When I checked the voltage at the fuel pump it would show 3.5-6 volts instead of 12 volts.

I was thinking fuel blockage or perhaps failure of the in-tank pumps. Sometimes the truck would start and run, othertimes it would neither start nor run. Typically, if running it would stay running until turned off (where the relay had to break).

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Good luck--let me know if this fixed your F-150.

riippa@aol.com

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1988 ford f150 fuel pump relay location


inner driver side fender well along with the eec relay

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