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Unread 08-15-2008   #1 (permalink)
msjsas is offline Rookie

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Default 1993 Mustang LX 2.3 - fuel pump not coming on

I have a 93 Mustang LX 2.3 and am having some issues with the fuel pump coming on. The fuel pump was replaced recently, the PCM unit (fuel pump relay module) on the passenger side strut tower is brand new as of today, the switch in the rear of the car isn't tripped. I have no clue where to look next. Here's what's confusing me, when I first started having this problem I would wiggle the PCM unit and it would come on and run just fine. After I made a short drive, about 2 hours, the car started idling rough, which had never happened before, and then quit. Now nothing works as far as fuel goes. The car gets a spark, the motor turns, everything is working fine just no fuel. I can't hear the fuel pump prime when I turn the key so I know the pump isn't getting power. Is it possible that the CPU has gone out? Any suggestions would be great. And sorry I wrote so much, I figured the more info I gave the more ppl could help. Thanks.
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Unread 08-15-2008   #2 (permalink)
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Chances are if your cpu went out you wouldn't even be getting spark. If you want to check that get a used one from a wrecking yard. Next check the fuel pump wire harness to see if it is even getting power and check the pcm also it can be done with an ohm meter I believe. Someone that knows more about that would be able to say for sure.
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Unread 08-16-2008   #3 (permalink)
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Hi,

The fuel pump really device you are refering to is actually called the CCRM - Constant Control Relay Module that houses the FP Realy, Ac and Fan relays.

Now, the 'new' one you have, is it the right part matching number for your car? It sounds like its the wrong part or its faulty. If the fuel pump is new and you cant hear the fuel pump prime when the key is on the 'On' position, that CCRM is faulty.

Also, check the wiring that runs from the back of the car and along the carpet on the drivers side of the car. Check for shorts ect.

When i replaced mine, this shop tried to sell me the wrong one. He did have the right one i needed though from a wrecked 2.3.

You could try jumping the Fuel Pump by the tank or using a jumper wire and jump the relay by the CCRM.

Hopefully this link will help you -

http://www.allfordmustangs.com/forum...rm-pin-out.jpg

I also forgot to mention that you can jump the FP via the DTC connector but you will have to look that up online as i didnt book mark it.
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Unread 08-19-2008   #4 (permalink)
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I too have had fuel pump problems. I have replaced multiple pumps and relays. Come to find out, certain companies such as airtech, carter, and master have been building inferior product. The pumps would work a few days and then they would seize. Working in the industry, I have received numerous returns on these fuel pumps. I suggest that you try after market such as eidelbrock, holley, or other high performance pumps. you will spend a little more, but your problem should go away.

p.s. this is not just a ford problem, it is also happens with GM and Dodge.
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Unread 08-19-2008   #5 (permalink)
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Quote:
Originally Posted by monkeyboy View Post
I too have had fuel pump problems. I have replaced multiple pumps and relays. Come to find out, certain companies such as airtech, carter, and master have been building inferior product. The pumps would work a few days and then they would seize. Working in the industry, I have received numerous returns on these fuel pumps. I suggest that you try after market such as eidelbrock, holley, or other high performance pumps. you will spend a little more, but your problem should go away.

p.s. this is not just a ford problem, it is also happens with GM and Dodge.
Get a Walbro, and not a knockoff one either
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