Fuel pump problems

easye88 · April 11th, 2010, 08:56 PM

ok. i just rebuilt the 4.6 in my 99 GT, got it in the car, cranked it until i got oil pressure, went to start it and no fuel. i listened for the pump to come on and nothing. whats wrong with it?

BakerFX4 · April 11th, 2010, 09:00 PM

check the fuel pump fuse under the hood. then check the red relay button in the trunk.

easye88 · April 11th, 2010, 09:01 PM

I checked the inertia switch in the trunk and it is fine. i will try the fuse next. thanks

BakerFX4 · April 11th, 2010, 09:04 PM

should be a small 20 amp (i believe) under the hood.

easye88 · April 11th, 2010, 09:06 PM

ok. if thats not the problem what else would you suggest?

BakerFX4 · April 11th, 2010, 09:07 PM

next would be to check to be sure ALL of your wiring harness is hooked up. The car was running before you pulled the motor correct?

easye88 · April 11th, 2010, 09:11 PM

yup...ive plugged in every plug that i unplugged under the hood

BakerFX4 · April 11th, 2010, 09:12 PM

besides not hearing the fuel pump, what is telling you that you arent getting fuel?

easye88 · April 11th, 2010, 09:15 PM

there is no fuel pressure at the fuel rails and none coming out of the injectors when i crank it

BakerFX4 · April 11th, 2010, 09:17 PM

got gas in it? lol hey, you never know! lol.

easye88 · April 11th, 2010, 09:18 PM

haha yeah that was the first thing i checked lol

BakerFX4 · April 11th, 2010, 09:22 PM

well check the fuse. Other than that, dunno.

easye88 · April 13th, 2010, 02:49 PM

the fuse was in good shape, so i dropped the tank, took the pump out, hooked it up to a 12 volt power supply and nothing. after reversing the leads i finally got it to break free and start working. i went ahead and ordered a new pump. hopefully i can get my car to start now lol.

another question. besides letting the new motor run at around 2500 rpm's for 30 minutes, what else should i do as far as breaking it in? how should i drive it for the first 1000 miles?

dcook_14 · April 13th, 2010, 03:10 PM

Drive it like you stole it

JK I just wouldn't goose it to 6k rpm for the first 500 miles, then change the oil and drive it like that again for another 500, change the oil again, and then you can drive however you want

April 11th, 2010, 08:56 PM	#1
easye88 Newbie 1999 Mustang GT Join Date: Apr 2010 Posts: 17 iTrader: 0 reviews	Fuel pump problems ok. i just rebuilt the 4.6 in my 99 GT, got it in the car, cranked it until i got oil pressure, went to start it and no fuel. i listened for the pump to come on and nothing. whats wrong with it?

April 11th, 2010, 09:00 PM	#2
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	check the fuel pump fuse under the hood. then check the red relay button in the trunk. __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

April 11th, 2010, 09:04 PM	#4
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	should be a small 20 amp (i believe) under the hood. __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

April 11th, 2010, 09:07 PM	#6
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	next would be to check to be sure ALL of your wiring harness is hooked up. The car was running before you pulled the motor correct? __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

April 11th, 2010, 09:12 PM	#8
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	besides not hearing the fuel pump, what is telling you that you arent getting fuel? __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

April 11th, 2010, 09:01 PM	#3
easye88 Newbie 1999 Mustang GT Join Date: Apr 2010 Posts: 17 iTrader: 0 reviews	I checked the inertia switch in the trunk and it is fine. i will try the fuse next. thanks

April 11th, 2010, 09:06 PM	#5
easye88 Newbie 1999 Mustang GT Join Date: Apr 2010 Posts: 17 iTrader: 0 reviews	ok. if thats not the problem what else would you suggest?

April 11th, 2010, 09:11 PM	#7
easye88 Newbie 1999 Mustang GT Join Date: Apr 2010 Posts: 17 iTrader: 0 reviews	yup...ive plugged in every plug that i unplugged under the hood

April 11th, 2010, 09:15 PM	#9
easye88 Newbie 1999 Mustang GT Join Date: Apr 2010 Posts: 17 iTrader: 0 reviews	there is no fuel pressure at the fuel rails and none coming out of the injectors when i crank it

April 11th, 2010, 09:17 PM	#10
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	got gas in it? lol hey, you never know! lol. __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

April 11th, 2010, 09:18 PM	#11
easye88 Newbie 1999 Mustang GT Join Date: Apr 2010 Posts: 17 iTrader: 0 reviews	haha yeah that was the first thing i checked lol

April 11th, 2010, 09:22 PM	#12
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	well check the fuse. Other than that, dunno. __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

April 13th, 2010, 02:49 PM	#13
easye88 Newbie 1999 Mustang GT Join Date: Apr 2010 Posts: 17 iTrader: 0 reviews	the fuse was in good shape, so i dropped the tank, took the pump out, hooked it up to a 12 volt power supply and nothing. after reversing the leads i finally got it to break free and start working. i went ahead and ordered a new pump. hopefully i can get my car to start now lol. another question. besides letting the new motor run at around 2500 rpm's for 30 minutes, what else should i do as far as breaking it in? how should i drive it for the first 1000 miles?

April 13th, 2010, 03:10 PM	#14
dcook_14 Banned 2004 Mustang GT 12.35@114.08 w/ 1.88 60' Join Date: Feb 2009 Location: Waterloo, IA Posts: 7,015 Blog Entries: 2 iTrader: 7 reviews	Drive it like you stole it JK I just wouldn't goose it to 6k rpm for the first 500 miles, then change the oil and drive it like that again for another 500, change the oil again, and then you can drive however you want __________________ Do the Right Thing, Cook. ~Zip.

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