Yet another fuel pump question

lx-missile · 11-14-2005, 07:36 PM

When I tried to fire the Mustang (91 lx 5.0) the fuel pump didn't kick on. I checked the voltage at the fuel pump relay and it showed about 12.5. Replaced the relay itself and still no fuel pump. Is there anything else I should check before buying a new pump?

(if so, you'll have to spell it out for me, I'm not the brightest crayon in the box).

Thanks for your help

Hozer 88GTConv · 11-14-2005, 07:49 PM

lx,
Is the fuel pump relay underneath the drivers seat? My motor bucks and jerks while cold, and even while cruising at steady rpm.
I have a feeling my fuel pump my be acting up, I noticed it seemed to cut off and on...hmmm.
good luck with your prob...incidentally, get as much gas out of the tank before you drop it. I'm sure you know this, but I left a couple of gallons in it, and it made it much more difficult....

lx-missile · 11-14-2005, 08:28 PM

Yep. Mine is under the drivers seat. I have heard that they can be located in a few different places.

HoodStrype · 11-14-2005, 11:20 PM

Check the Inetia Switch behind the drivers tail light? Hit the reset button just as a precaution.

lx-missile · 11-15-2005, 04:44 AM

Yeah. I'm afraid I've tried that (the inertia switch) too.

grey88gt · 11-15-2005, 10:20 PM

I would make sure you have voltage at the pump connection at the tank. Make sure the pump has a good ground also. You may need some one to turn the ignition on and off for you when you check the voltage. You will only get a 3 sec. flash when you turn the key on. A good multi-meter with a hold/or record function will work great if you dont have a helper. You may have to drop the tank down some what to get to the connections on top of the tank. Like Hozer said get all the fuel you can out of the tank, makes it much easier to work with. Good luck!

lx-missile · 11-19-2005, 04:30 PM

Finally got around to putting in the fuel pump. Not as bad as I thought it would be. Thanks again for your help, guys.

~The Jester~ · 11-19-2005, 08:22 PM

As long as you're up and running, that's what these guys are here for.

Glad you got it figured out bro!

11-14-2005, 07:36 PM	#1
lx-missile Registered Member Join Date: Sep 2004 Posts: 14	Yet another fuel pump question When I tried to fire the Mustang (91 lx 5.0) the fuel pump didn't kick on. I checked the voltage at the fuel pump relay and it showed about 12.5. Replaced the relay itself and still no fuel pump. Is there anything else I should check before buying a new pump? (if so, you'll have to spell it out for me, I'm not the brightest crayon in the box). Thanks for your help

11-14-2005, 07:49 PM	#2
Hozer 88GTConv Registered Member Join Date: Feb 2002 Location: Jacksonville, FL Posts: 706	Re: Yet another fuel pump question lx, Is the fuel pump relay underneath the drivers seat? My motor bucks and jerks while cold, and even while cruising at steady rpm. I have a feeling my fuel pump my be acting up, I noticed it seemed to cut off and on...hmmm. good luck with your prob...incidentally, get as much gas out of the tank before you drop it. I'm sure you know this, but I left a couple of gallons in it, and it made it much more difficult.... __________________ 1988 GT Convertible 331 10:1 TW heads, GT-40 intake, MSD, TRW flattops, B Cam w/ 1.7's, MAC exhaust, 24's, 70 TB, 76 MAF, 3.73's, Pro 5.0, Koni's, Anderson PMS, Wideband 02, yatta, yatta... One week with new motor, two speeding tickets...joy

11-14-2005, 08:28 PM	#3
lx-missile Registered Member Join Date: Sep 2004 Posts: 14	Re: Yet another fuel pump question Yep. Mine is under the drivers seat. I have heard that they can be located in a few different places.

11-14-2005, 11:20 PM	#4
HoodStrype Rearview Mirror Haze Join Date: May 1999 Location: Huntsville, Alabama...a.k.a. "HuntsVegas" Posts: 387	Re: Yet another fuel pump question Check the Inetia Switch behind the drivers tail light? Hit the reset button just as a precaution. __________________ 93 lx Notch 01 GT ...the epitome of Murphy's Law

11-15-2005, 04:44 AM	#5
lx-missile Registered Member Join Date: Sep 2004 Posts: 14	Re: Yet another fuel pump question Yeah. I'm afraid I've tried that (the inertia switch) too.

11-15-2005, 10:20 PM	#6
grey88gt Registered Member Join Date: Feb 2004 Location: Skiatook, Oklahoma Posts: 193	Re: Yet another fuel pump question I would make sure you have voltage at the pump connection at the tank. Make sure the pump has a good ground also. You may need some one to turn the ignition on and off for you when you check the voltage. You will only get a 3 sec. flash when you turn the key on. A good multi-meter with a hold/or record function will work great if you dont have a helper. You may have to drop the tank down some what to get to the connections on top of the tank. Like Hozer said get all the fuel you can out of the tank, makes it much easier to work with. Good luck!

11-19-2005, 04:30 PM	#7
lx-missile Registered Member Join Date: Sep 2004 Posts: 14	Re: Yet another fuel pump question Finally got around to putting in the fuel pump. Not as bad as I thought it would be. Thanks again for your help, guys.

11-19-2005, 08:22 PM	#8
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: Yet another fuel pump question As long as you're up and running, that's what these guys are here for. Glad you got it figured out bro! __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

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