Fuel pump/system continues to run..

Jacob_M · 06-10-2002, 10:21 PM

My '90 Mustang w/ a 4 cyl. has a problem. When I turn off my car, the fuel system keeps running. The fuel pump doesnt turn off and listening under the hood you can hear it in the fuel rails cycling gas. This ultimatly leads to a dead battery and probably will get into worse condition. So is this a fuel pump relay or fuel pressure regulator problem? Any help will be greatly apprieciated.

mustangII460 · 06-10-2002, 11:25 PM

Now sure what would cause that although one thing came to mind, maybe your ignition switch is bad? Try shaking it around while someone listens. I know Ford had switch problems those years causing shorts/fires. Ford recalled a bunch of them.

Just guessing

joe4speed · 06-10-2002, 11:29 PM

try your relay, Mine did that a long time ago, I replaced, the relay, the injectors, the FPR, but it wound up being the ECM. Go for the ceap stuff first! Good luck!

PKRWUD · 06-11-2002, 06:36 AM

Odds are that it's the relay, but it could be the ign. sw. too.

Take care,
-Chris

Old Guy with 87 GT · 06-11-2002, 08:00 AM

if it's not the relay sticking then check out the distributer ....on the ford system the computer controls the relay depending on what signals it gets
......when it gets a signal from the ignition it only turns on the pump for a couple of seconds to pressuerize system ,
......after that it doesn't turn the pump on constant flow till it gets a signal from the distributer(telling it the cars running )....there is a pick up in the distributer that sences rotation (its a seperate circuit in the tfi )if the pick up in the distibuter fails it can fool the computer into thinking the car is still running

my 87 did this a couple of times .....i cleaned the distributer out (cotact cleaner and air)and cleaned the contacts for the tfi and it hasn't done it since

Jacob_M · 06-11-2002, 10:05 PM

Ok, I bought a new relay and now the trouble is that I cant find where it is. The Haynes manual has no luck to it either. I looked under the hood, by the tank, and under the carpet in the back but couldnt find the dang thing. Anybody have an idea??

joe4speed · 06-11-2002, 10:21 PM

underneath the drivers side seat

06-10-2002, 10:21 PM	#1
Jacob_M Registered Member Join Date: Jan 2002 Location: Mount Vernon, WA Posts: 10	Fuel pump/system continues to run.. My '90 Mustang w/ a 4 cyl. has a problem. When I turn off my car, the fuel system keeps running. The fuel pump doesnt turn off and listening under the hood you can hear it in the fuel rails cycling gas. This ultimatly leads to a dead battery and probably will get into worse condition. So is this a fuel pump relay or fuel pressure regulator problem? Any help will be greatly apprieciated.

06-10-2002, 11:29 PM	#3
joe4speed He said Member...heh, heh Join Date: Sep 1999 Location: Jupiter, Florida U.S.A. Posts: 3,718	try your relay, Mine did that a long time ago, I replaced, the relay, the injectors, the FPR, but it wound up being the ECM. Go for the ceap stuff first! Good luck! __________________ *Joe!* 1988 GT, 13.58@101mph Check out my listing! Click here! Or my website:www.joe4speed.com

06-11-2002, 06:36 AM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Odds are that it's the relay, but it could be the ign. sw. too. Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

06-11-2002, 08:00 AM	#5
Old Guy with 87 GT Registered Member Join Date: May 2001 Location: Harrisburg, Pennsylvania Posts: 379	if it's not the relay sticking then check out the distributer ....on the ford system the computer controls the relay depending on what signals it gets ......when it gets a signal from the ignition it only turns on the pump for a couple of seconds to pressuerize system , ......after that it doesn't turn the pump on constant flow till it gets a signal from the distributer(telling it the cars running )....there is a pick up in the distributer that sences rotation (its a seperate circuit in the tfi )if the pick up in the distibuter fails it can fool the computer into thinking the car is still running my 87 did this a couple of times .....i cleaned the distributer out (cotact cleaner and air)and cleaned the contacts for the tfi and it hasn't done it since __________________ the "not so old",old guy 87 Mustang GT T-top >hanlon t-5, pro 5.0, centerforce clutch ,adj. cable/quatrant ,3.27s ,full 2 1/2 ex(off road H) adj. reg. ,e-cam ,70mm TB, cobra intake ,1.7rr ,ported/milled e7ets w/crane springs ,306 balaced/decked short block w/speed pro forged flat top pistons ...257rwhp/302rwt best et 13.7@102 (4/11 ) '80 Capri (future project,currently collecting parts for 351 moter)

06-11-2002, 10:21 PM	#7
joe4speed He said Member...heh, heh Join Date: Sep 1999 Location: Jupiter, Florida U.S.A. Posts: 3,718	underneath the drivers side seat __________________ *Joe!* 1988 GT, 13.58@101mph Check out my listing! Click here! Or my website:www.joe4speed.com

06-10-2002, 11:25 PM	#2
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	Now sure what would cause that although one thing came to mind, maybe your ignition switch is bad? Try shaking it around while someone listens. I know Ford had switch problems those years causing shorts/fires. Ford recalled a bunch of them. Just guessing

06-11-2002, 10:05 PM	#6
Jacob_M Registered Member Join Date: Jan 2002 Location: Mount Vernon, WA Posts: 10	Ok, I bought a new relay and now the trouble is that I cant find where it is. The Haynes manual has no luck to it either. I looked under the hood, by the tank, and under the carpet in the back but couldnt find the dang thing. Anybody have an idea??

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