fuel pump wont turn on...

March 3rd, 2008, 02:49 PM	#1
e3sean MM Fanatic 1988 lx 5.7 11.5@116 Join Date: Nov 2007 Location: arizona Posts: 3,229	fuel pump wont turn on... ok i am yet to get my car started cause a few issues here is one..car ran when i pulled it into the garage changed the motor converted it to mass air so i swapped the wire harness.. i can not get it to turn on. looks like someone pypassed the inerta swith the plug is gone and it has a connector between the two wire. where does the fuel pump get its power from?\ what are my options to fix it? not sure if its any relation but i also can not get my lights to turn on... __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

March 3rd, 2008, 03:30 PM	#2
SALIV8 Enthusiast Join Date: Dec 2006 Location: Lookin' at you in my rearview Posts: 516	have you plled up a schematic and checked fuses/relays/switches/etc?

March 3rd, 2008, 03:53 PM	#3
e3sean MM Fanatic 1988 lx 5.7 11.5@116 Join Date: Nov 2007 Location: arizona Posts: 3,229	i checked all the fuses i found the relay under the driver side seat there is a power going to it but it wont switch it over to turn the pump on... __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

March 3rd, 2008, 04:15 PM	#4
SALIV8 Enthusiast Join Date: Dec 2006 Location: Lookin' at you in my rearview Posts: 516	did u chek neutral safety switch?is it an auto? or your clutch not completely pushed?

March 3rd, 2008, 04:20 PM

Onemanzu

MM Phantom

Join Date: Oct 2006

Location: looking for free hand jobs in poland springs nebraska... silly gooses

Posts: 11,159

you know that the relay is good? i had a problem with an old Volkswagen relay... went through 3 before one worked

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Originally Posted by omz

How to search
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CRT Performance

March 3rd, 2008, 04:36 PM	#6
e3sean MM Fanatic 1988 lx 5.7 11.5@116 Join Date: Nov 2007 Location: arizona Posts: 3,229	it all worked before i pulled the engine out.. it has to have something to do with the new wireharness/computer or my error somewhere.. what i need to know is where the fuel pump gets its power source from like the ignition or a fuze box. also when the car is running is the fuel pump always on?? if it is i can just wire it to an accessory 12v power supply __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

March 3rd, 2008, 06:32 PM	#7
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,647	http://www.veryuseful.com/mustang/te...nks-ign-ac.gif This should help you. I would start by checking to see if you are getting 12v at the fuel pump when you cycle the key (maybe your fuel pump died while sitting). If no 12V, check at the relay hot side (orange/blue wire). If no, blown fusible link. If yes, check the red/black wire should become hot when you cycle the key on and off (prime the pump). If no, your problem is in that circuit. If yes, most likely it is the relay ground, which is provided by the computer (tan green wire on the relay). try grounding this wire and cycling the key if everything else checks out. Hope that helps. __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

March 3rd, 2008, 06:42 PM	#8
crowbar73 Regular 1989 Mustang GT Join Date: Jul 2007 Location: Waynesboro, VA Posts: 117	Dang Ryan, you beat me to it. I just went to my garage to get a wiring diagram. (I couldn't remember the wire colors). Oh well, I tried. P.S. your car is a rocket man! __________________ He is no fool who gives what he cannot keep to gain what he cannot lose." Jim Elliot Garage: http://www.moddedmustangs.com/forums...-member-10915/

March 3rd, 2008, 08:18 PM

87 5.0

Regular

Join Date: Jan 2008

Posts: 90

Originally Posted by crowbar73

Dang Ryan, you beat me to it. I just went to my garage to get a wiring diagram. (I couldn't remember the wire colors). Oh well, I tried. P.S. your car is a rocket man!

Since when did mustangs become ROCKETS????

March 3rd, 2008, 08:27 PM

#10

e3sean

MM Fanatic

1988 lx 5.7

11.5@116

Join Date: Nov 2007

Location: arizona

Posts: 3,229

Originally Posted by ryans88gt

http://www.veryuseful.com/mustang/te...nks-ign-ac.gif

This should help you. I would start by checking to see if you are getting 12v at the fuel pump when you cycle the key (maybe your fuel pump died while sitting).

If no 12V, check at the relay hot side (orange/blue wire). If no, blown fusible link. If yes, check the red/black wire should become hot when you cycle the key on and off (prime the pump). If no, your problem is in that circuit. If yes, most likely it is the relay ground, which is provided by the computer (tan green wire on the relay). try grounding this wire and cycling the key if everything else checks out. Hope that helps.

i am getting power to the relay and it is not going to the red wire when the car is cycled so the green wire when grounded should put power to the pump? if that works its the computer..

__________________
the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331
MILITARY CREW
USAF LUKE AFB AZ,
E-5 SELECT 7995
AMMO I.Y.A.A.Y.A.S

March 4th, 2008, 05:47 AM	#11
crowbar73 Regular 1989 Mustang GT Join Date: Jul 2007 Location: Waynesboro, VA Posts: 117	if you don't get power at the red/black wire at the fuel pump relay when you cycle the key, i would go check at the inertia switch (in the trunk) and see if you have power there when you cycle the key. maybe there is a loose connection there. if no power on either wire there, you need to find the eec power relay and check for power there on black/orange wire. if no power on black/orange check fuse link G? If you do have power on blk/org it is probably an ignition switch failure. hope that makes sense? __________________ He is no fool who gives what he cannot keep to gain what he cannot lose." Jim Elliot Garage: http://www.moddedmustangs.com/forums...-member-10915/

March 12th, 2008, 12:28 PM

#12

Black Five 0h

Regular

1990 Mustang Lx

??@ i wanna know

Join Date: Mar 2007

Location: Connecticut

Posts: 450

any luck on this?

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90 Mustang LX

Originally Posted by woody1

what a pile of fuck

March 12th, 2008, 02:17 PM	#13
ryans88gt MM Fanatic Join Date: May 2007 Location: Bloomington, IL Posts: 3,647	He wasn't getting power at the red/black wire because his ECU relay was blown. Sean, hope you don't mind if I answer for you __________________ 89 LX 515 hp 497 ftlbs 11.3 @ 125 mph 88 GT 11.4 @ 118

March 12th, 2008, 02:27 PM	#14
e3sean MM Fanatic 1988 lx 5.7 11.5@116 Join Date: Nov 2007 Location: arizona Posts: 3,229	nope i forgot about this post.. yeah like ryan said it was the ecu relay was bad i replaced it and it all started working again. just cause something worked when u used it last doesnt mean its gonna work next time u go to use it...i learned that the hard way... __________________ the only thing u will be burning by going with a 347 insted of a 331 is the guy driving the 331 MILITARY CREW USAF LUKE AFB AZ, E-5 SELECT 7995 AMMO I.Y.A.A.Y.A.S

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