This is driving me nuts!!!
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Member
Joined: Jan 2006
Posts: 137
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From: Flint, MI
Car: 05 C6, 91 z28 Vert, 66 Mustang vert
Engine: Ls2, TPI 350, 289 4bbl
Transmission: T-56, T-5, C4
Axle/Gears: 3.42,3.08,3.73
This is driving me nuts!!!
I cant get the car to start, 91 Z28 M5 (350 with the 305 tpi I unit/heads,- BBK TB headers accel 30# injectors, mild injection cam ... I dont hear the fuel pump prime when I key on.... The fuel pump fuse is good... I ran a wire off the battery to the red fuel pump pig tail... it sparked but no sound out of the pump... is that the definitive sign for a bad pump? the car was running when it was parked in 01'
I also swapped relays with the cooling fan and the pump... no sound.... I just want to be sure its the pump before going through the hassle of R&Ring the tank.
I also swapped relays with the cooling fan and the pump... no sound.... I just want to be sure its the pump before going through the hassle of R&Ring the tank.
Thread Starter
Member
Joined: Jan 2006
Posts: 137
Likes: 0
From: Flint, MI
Car: 05 C6, 91 z28 Vert, 66 Mustang vert
Engine: Ls2, TPI 350, 289 4bbl
Transmission: T-56, T-5, C4
Axle/Gears: 3.42,3.08,3.73
14 views, no one knows? I hope I'm not the first one to have this problem...
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Everyone, including you, will know a lot more after you go out and buy a fuel pressure gage and find out what the pressure is doing.
With the modifications you've listed, that should have been in your toolbox a long time ago.
With the modifications you've listed, that should have been in your toolbox a long time ago.
Thread Starter
Member
Joined: Jan 2006
Posts: 137
Likes: 0
From: Flint, MI
Car: 05 C6, 91 z28 Vert, 66 Mustang vert
Engine: Ls2, TPI 350, 289 4bbl
Transmission: T-56, T-5, C4
Axle/Gears: 3.42,3.08,3.73
Originally Posted by five7kid
Everyone, including you, will know a lot more after you go out and buy a fuel pressure gage and find out what the pressure is doing.
With the modifications you've listed, that should have been in your toolbox a long time ago.
With the modifications you've listed, that should have been in your toolbox a long time ago.
Joined: Mar 2000
Posts: 43,187
Likes: 42
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Okay, you didn't mention that. Are you sure the gage is working properly?
If you know you're getting electrical power to the pump, and you know you don't have a pressure restriction in the piping (fuel filter clogged, smashed line, etc.), then you've probably got your answer.
Certainly wouldn't be the first pump that died while sitting for an extended time.
If you know you're getting electrical power to the pump, and you know you don't have a pressure restriction in the piping (fuel filter clogged, smashed line, etc.), then you've probably got your answer.
Certainly wouldn't be the first pump that died while sitting for an extended time.
Thread Starter
Member
Joined: Jan 2006
Posts: 137
Likes: 0
From: Flint, MI
Car: 05 C6, 91 z28 Vert, 66 Mustang vert
Engine: Ls2, TPI 350, 289 4bbl
Transmission: T-56, T-5, C4
Axle/Gears: 3.42,3.08,3.73
Originally Posted by five7kid
Okay, you didn't mention that. Are you sure the gage is working properly?
If you know you're getting electrical power to the pump, and you know you don't have a pressure restriction in the piping (fuel filter clogged, smashed line, etc.), then you've probably got your answer.
Certainly wouldn't be the first pump that died while sitting for an extended time.
If you know you're getting electrical power to the pump, and you know you don't have a pressure restriction in the piping (fuel filter clogged, smashed line, etc.), then you've probably got your answer.
Certainly wouldn't be the first pump that died while sitting for an extended time.
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Joined: Jul 2003
Posts: 4,803
Likes: 2
From: Grand Rapids, MI
Car: Z28
Engine: Sb2.2 406
Transmission: Jerico 4 speed
Axle/Gears: Ford 9" 3.60
What red wire exactly did you run power to exactly? The only red wire in the fuel pump control wiring is the wire that goes from the ALDL to the relay, as far as my diagram shows. If that holds true, that still doesn't rule out a ECM memory/fuel pump relay fuse. If that fuse blows out, then the relay doesn't get power. If that doesn't get power, then the "red" wire (still going on that assumption...) won't have any effect. The wire you want to give power to is the gray wire (12v out of the relay, to the pump).
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Thread Starter
Member
Joined: Jan 2006
Posts: 137
Likes: 0
From: Flint, MI
Car: 05 C6, 91 z28 Vert, 66 Mustang vert
Engine: Ls2, TPI 350, 289 4bbl
Transmission: T-56, T-5, C4
Axle/Gears: 3.42,3.08,3.73
Originally Posted by Stekman
What red wire exactly did you run power to exactly? The only red wire in the fuel pump control wiring is the wire that goes from the ALDL to the relay, as far as my diagram shows. If that holds true, that still doesn't rule out a ECM memory/fuel pump relay fuse. If that fuse blows out, then the relay doesn't get power. If that doesn't get power, then the "red" wire (still going on that assumption...) won't have any effect. The wire you want to give power to is the gray wire (12v out of the relay, to the pump).
Member
Joined: Jun 2005
Posts: 267
Likes: 0
From: Punta Gorda Florida
Car: 91 RS
Engine: 5.0 tbi
Transmission: 700r4
it needs a pump most likely, and if your so perplexed bout the time to do it,.............................then cheat it and cut the hump and do it in the trunk like MOST other people.....if you have a lift that'll cut out like 2 hours in time....if your slow....with no lift like 4 hours
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