ignition relay, or fuel pump problem????

[mheinjr]

OK, I have a slight problem and I don't know where to look.

SOMETIMES:
When I start my car my fuel pump runs and doesn't stop running, so than I turn my key off and turn it back on it runs and shuts off like it is supposed to do.

I can't run my car when this happens. It breaks up and wants to stall on me. There is a service engine soon light when this happens but I don't know what code it is, but all I have to do is turn it off and listen for the fuel pump to stop and it is fine

Where do I look to fix this problem is there some sort of relay under the hood or somthing I need to change? Cause I doubt it is the fuel pump cause thee is a msg sending to the fuel pump to tell it to work, and the msg I guess is not telling it to turn off.

Anything please????

[5150 LX]

Not sure if the relay is the problem but the fuel pump relay will be located in one of two spots (can't recall the year they changed location). It will either be under the drivers seat or it will be on the inner fender near the location of a stock MAF. If yours is near the MAF there will be two relays there, one is fuel pump & other is a/c related if I recall correctly, try just swapping the two relays & see if that helps.

Your best bet would be pulling the codes.

[mheinjr]

Hmm well it is dark right now and my car is still hot, but I didn't see anything under either seats, and I looked over by where the stock MAF would be. I noticed 1 relay under my Powerpipe. just 1 not 2. So what I am going to do is go down to the junkyard tomarrow and check some mustangs out there and look. Mine should have 2 like you said it had A/C, but I really think there was only 1 right there... Do they look the same?

[5150 LX]

I just looked at mine and the two look very similiar. Being that you only have one, I would presume that your fuel pump relay is located under the driver's seat. You may have to check under the carpet to locate it though.

[mheinjr]

Thanks, It was under the driver seat... The first time I looked I didn't see it cause it had a metal plate around it, than I moved the seat all the way forward, and I looked through the back and there it was right behind that metal plate... Everything works good now.. still needs a tune though... comming next week sometime

[5150 LX]

Sweet, I can now confirm that 92 models are beneath the seat and 92's are not. Glad it was a simple fix.

[UNTCHBL]

Sean, my 92 is under the hood. I have a similar problem with the pump never turning on. I've done everthing, replaced the relay, pcm, you name it. Can't get the damn feul pumps to run for nothing.

Just as soon as I have some money I'll be taking this heap to someone to fix it.

Brandon

[5150 LX]

Does the relay get power? Have you checked all your fuses? If I recall correctly, you had this problem surface when you removed the PMS from it. I would retrace you work from there, maybe disconnected a ground to the computer. What about the relay that's located close to the EEC, I personally don't know what it's for but there is one (relay) there on my 92.

$20 bucks says it's something simple & stupid, those are the one's that are always a PITA to find.