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5.4L 2003 F250 Fuel Pump Relay Location

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Old 04-04-2016, 04:36 PM
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5.4L 2003 F250 Fuel Pump Relay Location

Hi

I have a 5.4L 2003 F250. I need to know where Fuel Pump Relay Location is? It's not in the fuse box. Is it under the hood?

Thanks,

Patrick
 
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Old 04-04-2016, 08:10 PM
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There is an underhood relay block, but the owner's manual doesn't describe it.
 
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Old 04-04-2016, 10:19 PM
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It seems to not be a serviceable part or so the technician said when I went to Ford today. It's part of the whole fuse box under the driver access panel inside the truck. That is really weird. If it goes bad you have to replace the whole part which is I have attached. https://www.f150online.com/g/album/5277211
 

Last edited by phurley; 04-04-2016 at 10:36 PM.
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Old 04-05-2016, 07:16 AM
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The information you were given regarding the relay is correct as far as a dealer is concerned. They will simply replace the whole fuse box.

It is not difficult to splice in a common Bosch-style relay externally to the fuse box. I know I've written it up somewhere as have other forum posters, either here or at sister site FTE.
 
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Old 04-22-2016, 10:55 AM
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Bump...
 
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Old 04-22-2016, 02:16 PM
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Originally Posted by goathead
Bump...
For what?
 
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Old 04-04-2017, 02:57 PM
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Splicing relay

Originally Posted by projectSHO89
The information you were given regarding the relay is correct as far as a dealer is concerned. They will simply replace the whole fuse box.

It is not difficult to splice in a common Bosch-style relay externally to the fuse box. I know I've written it up somewhere as have other forum posters, either here or at sister site FTE.
I'm pretty new to this truck (2002 F250 5.4) and am having trouble getting it to start. I've checked/replaced all of the following: fuses, plugs, coils, inertia switch, cam shaft sensor, crankshaft sensor, and new battery. I've got a fuel pump coming in the mail and am narrowing the issue down to either the PCM or this fuel pump relay.

Do you mind explaining how to splice the Bosch-style relay into the box?
 
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Old 04-04-2017, 03:56 PM
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Do you mind explaining how to splice the Bosch-style relay into the box?
See where I said "I know I've written it up somewhere as have other forum posters, either here or at sister site FTE."? That means someone is going to have to find it back (not me).

Before picking up another part or tool, connect a test light to the pump power feed located at the inertia switch and check for power during the initial power-on priming cycle.

You need to know which half of the truck to focus on, otherwise you're going to continue pi$$ing away money and time just trowing parts at it and hoping you guessed right (again).
 
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Old 04-05-2017, 02:32 AM
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Originally Posted by projectSHO89
See where I said "I know I've written it up somewhere as have other forum posters, either here or at sister site FTE."? That means someone is going to have to find it back (not me).

Before picking up another part or tool, connect a test light to the pump power feed located at the inertia switch and check for power during the initial power-on priming cycle.

You need to know which half of the truck to focus on, otherwise you're going to continue pi$$ing away money and time just trowing parts at it and hoping you guessed right (again).
It's new to me but it's a fairly old truck, and I don't mind getting to know it. I just bought a new fuse box for it. So, I doubt I'll have to splice anything, but I do appreciate you taking the time to help.

Glad to be a part of the forum. I'll post any success.
 
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Old 06-30-2017, 10:53 AM
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Originally Posted by projectSHO89
For what?
good question....my browser should have been on another thread when i typed that and it posted here.
 



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