Where is the fuel pump relay?
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Old February 28th, 2010, 03:31 PM   2 links from elsewhere to this Post. Click to view. #1
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Where is the fuel pump relay?


where is the fuel pump relay on a 99? It is not under the seat like the book says. This thing will not start but if you put the battery cahrger on it on start mode it will with out the charger the fuel pump does not run but with it it will. It has a new battery it is either the pump or the relay in my eyes. I think the contacts are bad on the relay?
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Old February 28th, 2010, 03:51 PM   #2
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left rear tailight?
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Old February 28th, 2010, 03:58 PM   #3
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my bad thats the shut off.

http://www.2carpros.com/forum/1999-f...-vt159386.html
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Old February 28th, 2010, 04:00 PM   #4
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nope there is the enursha switch there that is it. Or however you spell it.
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Old February 28th, 2010, 08:43 PM   #5
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That is not a relay that is a curcit breaker.
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Old February 28th, 2010, 08:45 PM   #6
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Stole the pic from another site (I don't have any fuse box diagrams saved ) but that should be under the hood, just back from the battery. Fuel pump relay is highlighted in blue.
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Old February 28th, 2010, 08:47 PM   #7
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Originally Posted by mcqueen View Post

Stole the pic from another site (I don't have any fuse box diagrams saved ) but that should be under the hood, just back from the battery. Fuel pump relay is highlighted in blue.
thats the link i posted before so not sure if it worked for him
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Old February 28th, 2010, 08:49 PM   #8
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Ah I didn't even see that
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Old February 28th, 2010, 08:52 PM   #9
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nope it is not a relay
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Old February 28th, 2010, 08:55 PM   #10
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in red.

99 mustang fuel pump driver module image by PTCruiser2002 on Photobucket

It is a fuel pump driver module.
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Old February 28th, 2010, 09:11 PM   #11
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I seen this but did not see a relay there in the pic it looks like it was added do you know more about this?
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Old February 28th, 2010, 09:16 PM   #12
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It is not added.

this is what it looks like.

http://www.fordf150.net/images/articles/fpdm3.jpg

Don't mind that this pic shows one from an f150. all shaped kind of the same.
The fpdm is not the relay pictured.. it it behind the metal plate.
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Old February 28th, 2010, 09:19 PM   #13
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you seem to sound like you know what you are talking about lol Is this a comon problem does this sound like what it could be?
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Old February 28th, 2010, 09:24 PM   #14
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Doesn't sound like a fuel issue at all to me to be honest.

If I got your first post right you basically said that WITH a charger on start mode it will start and without a charger it won't run the fuel pump or start.

Sounds like you got a dud battery that has no cca's honestly.
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Old February 28th, 2010, 09:50 PM   #15
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It is my bro's car it was doing this so he bought a new battery and it did not fix it he no's nothing about cars he did plugs wires and every thing. I went and got the car today. When you turn the key on the pump does not prime. when you crank it it will not start. i noticed when i put the charger on it only on 250 amp it will start. It will start a few times after that. Then it needs jumped again. It seems like the contacts are burnt up on the relay was my thought.
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Old February 28th, 2010, 09:52 PM   #16
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It has been sitting for about 2 months like this. I took it to the zone and they ran codes came up with nothing i tested the battery tested fine.
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Old February 28th, 2010, 09:57 PM   #17
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Odd for sure.
If the battery checks out then at least we know it is not that.

Like I said, check out the fdpm if anything. It is kind of hard to diagnose over the net ya know?
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Old February 28th, 2010, 10:02 PM   #18
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Where the heck is the CCRM located on a '99 Mustang?? Is that it hiding INSIDE the fender, on the passenger side behind the Intake/air filter hardware??
I dug around on some other forums and 3 out of 3 had the above reply.
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Old February 28th, 2010, 10:10 PM   #19
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ccr? ya i here ya on the diagnose i am not even sure what that does yet. I need to do some more resech i have always had 5.0 and the newest was a 97 this 99 v6 is screwy
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Old February 28th, 2010, 10:16 PM   #20
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Originally Posted by 86ttops View Post
ccr? ya i here ya on the diagnose i am not even sure what that does yet. I need to do some more resech i have always had 5.0 and the newest was a 97 this 99 v6 is screwy
Constant Control Relay Module. It is a module that has the relays in it for AC, Fan, Fuel Pump and injectors from all I have read. It also seems like it is a single unit but it does not fail as a unit, but individual relays in the unit can fail. I guess basically a housing with a few relays in it. It also seems like it takes a ton of abuse because of its location.

Edit: The more I read about it, it seems like several ford cars and trucks have issues with it. Not all but a good many.
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Last edited by bb0029; February 28th, 2010 at 10:19 PM.
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