Fuel delivery problem

NYstang · 06-15-2006, 07:26 AM

87 Mustang GT
I have a strange problem somewhere in the fuel delivery system. The problem is that on hot days (above 75 degress) when I drive the car for more than 20 minutes or so, after I shut the car off, when I try to start it again the fuel pump will not turn on. Thus the car won't start. After it cools for a while I turn the key and hear the fuel pump turn on, then it starts fine. In 12 years I've had the car this has been an on going problem going back about 8 years. I have replaced the fuel pump twice and had a short fixed once. What could be causing the fuel pump to not turn on? (fuel pump is in the tank) Thanks.

Phil

82 GT · 06-15-2006, 09:08 AM

It could be the ignition module. They are notorious for not wanting to work right when it's hot out....especially if it's still the stock one. Just something to consider.....

Dark Knight · 06-15-2006, 10:22 AM

Check the relay and the inertia switch. You should hear the fuel pump with the key on.

NYstang · 06-16-2006, 07:53 AM

Quote:

Originally Posted by 82 GT

It could be the ignition module. They are notorious for not wanting to work right when it's hot out....especially if it's still the stock one. Just something to consider.....

I'm sure the ignition module is the original, I never replaced it. If it was bad would that make the fuel pump not turn on? After its hot, I turn the key forward and usually you hear the fuel pump turn on, but when it does this I don't hear the fuel pump turn on.

Phil

NYstang · 06-16-2006, 08:02 AM

Quote:

Originally Posted by Dark Knight

Check the relay and the inertia switch. You should hear the fuel pump with the key on.

I forgot, about 3-4 years ago, I had the relay replaced, didn't help. I'll check the inertia switch. Thanks.

Phil

Dark Knight · 06-16-2006, 09:03 AM

Might check the relay anyway... I've had a new ignition module go out in less than a year, and the next last for 4-5 years..

06-15-2006, 07:26 AM	#1
NYstang Registered Member Join Date: Jun 2003 Location: NY Posts: 12	Fuel delivery problem 87 Mustang GT I have a strange problem somewhere in the fuel delivery system. The problem is that on hot days (above 75 degress) when I drive the car for more than 20 minutes or so, after I shut the car off, when I try to start it again the fuel pump will not turn on. Thus the car won't start. After it cools for a while I turn the key and hear the fuel pump turn on, then it starts fine. In 12 years I've had the car this has been an on going problem going back about 8 years. I have replaced the fuel pump twice and had a short fixed once. What could be causing the fuel pump to not turn on? (fuel pump is in the tank) Thanks. Phil __________________ Phil

06-15-2006, 09:08 AM	#2
82 GT Import Slayer Join Date: May 1999 Posts: 2,241	Re: Fuel delivery problem It could be the ignition module. They are notorious for not wanting to work right when it's hot out....especially if it's still the stock one. Just something to consider..... __________________ '82 GT 351W (.060)Comp Cams 274* Extreme Energy cam, ported & polished heads w/ 1.94/1.60 valves 10.3:1 flat top pistons,stealth intake, Mallory dizzy,Holley 750dp carb, BBK shorties,Flowmaster exhaust,C-4 with 3700 stall converter, B&M pro shifter,8.8 rear, 4:10's, subframes, electric fan, powermaster alternator, 4 core radiator.

06-15-2006, 10:22 AM	#3
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	Re: Fuel delivery problem Check the relay and the inertia switch. You should hear the fuel pump with the key on. __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

06-16-2006, 09:03 AM	#6
Dark Knight Registered Member Join Date: Oct 1998 Location: Az Posts: 854	Re: Fuel delivery problem Might check the relay anyway... I've had a new ignition module go out in less than a year, and the next last for 4-5 years.. __________________ 84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg

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