no pressure
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
no pressure
On the 98, what would cause the fuel pressure to drop from 60 to 0 in a couple of seconds after switching the car off, and NOT have any pressure when it is switched on? (causing the car to have to turn over for several seconds before it will crank.)
(I just had a dyno tune done, and it wasn't a problem before the tune)
(I just had a dyno tune done, and it wasn't a problem before the tune)
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
How do i check?
The injectors are basically brand new; Although they are several months old, I put them in when I did my blower, so that have apprx. 1600 miles on them.
The pump IS brand new. I had a few delivery problem, so I pulled the old LPE pump and put a brand new one in a few months back, and have just now gotten it tuned (for WOT)It has approx. 800 miles on it.
The injectors are basically brand new; Although they are several months old, I put them in when I did my blower, so that have apprx. 1600 miles on them.
The pump IS brand new. I had a few delivery problem, so I pulled the old LPE pump and put a brand new one in a few months back, and have just now gotten it tuned (for WOT)It has approx. 800 miles on it.
Tech Contributor
Joined: Jan 2007
Posts: 19,535
Likes: 1,196
From: Dyer, IN
How do i check?
The injectors are basically brand new; Although they are several months old, I put them in when I did my blower, so that have apprx. 1600 miles on them.
The pump IS brand new. I had a few delivery problem, so I pulled the old LPE pump and put a brand new one in a few months back, and have just now gotten it tuned (for WOT)It has approx. 800 miles on it.
The injectors are basically brand new; Although they are several months old, I put them in when I did my blower, so that have apprx. 1600 miles on them.
The pump IS brand new. I had a few delivery problem, so I pulled the old LPE pump and put a brand new one in a few months back, and have just now gotten it tuned (for WOT)It has approx. 800 miles on it.
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Tech Contributor
Joined: Jan 2007
Posts: 19,535
Likes: 1,196
From: Dyer, IN
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
I don't have a line on it since I am FI (was told to vent it to atmosphere instead of installing it in the airflow like stock) and I just looked at it and it has no leak. There is a slight odor around the engine, but nothing strong.
I pulled the injector rail out to check for an injector leak, and laid it on a towel and switched the car on. You can hear the pump run a few seconds and shut off as it always does, but there is not a drop leaking from anywhere. Gauge shows zero, when it used to show 60 with the car switched on but not running.
Where do I go from here?
I pulled the injector rail out to check for an injector leak, and laid it on a towel and switched the car on. You can hear the pump run a few seconds and shut off as it always does, but there is not a drop leaking from anywhere. Gauge shows zero, when it used to show 60 with the car switched on but not running.
Where do I go from here?
Tech Contributor
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From: Dyer, IN
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Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
If I switch the car on, the digital gauge I have, has to quickly go through it's little diagnostic test, which take a few seconds. when it shows a reading it's 2-1-0 (in less than a second span), then stays at 0 as long as it's switched on.
Tech Contributor
Joined: Jan 2007
Posts: 19,535
Likes: 1,196
From: Dyer, IN
When the car is running, it is 59-60; When I switch it off, it bleeds down from 60 to zero is 2-3 secs.
If I switch the car on, the digital gauge I have, has to quickly go through it's little diagnostic test, which take a few seconds. when it shows a reading it's 2-1-0 (in less than a second span), then stays at 0 as long as it's switched on.
If I switch the car on, the digital gauge I have, has to quickly go through it's little diagnostic test, which take a few seconds. when it shows a reading it's 2-1-0 (in less than a second span), then stays at 0 as long as it's switched on.
Melting Slicks
Joined: Dec 2003
Posts: 3,315
Likes: 17
From: Near Jacksonville Fl.
When the car is running, it is 59-60; When I switch it off, it bleeds down from 60 to zero is 2-3 secs.
If I switch the car on, the digital gauge I have, has to quickly go through it's little diagnostic test, which take a few seconds. when it shows a reading it's 2-1-0 (in less than a second span), then stays at 0 as long as it's switched on.
If I switch the car on, the digital gauge I have, has to quickly go through it's little diagnostic test, which take a few seconds. when it shows a reading it's 2-1-0 (in less than a second span), then stays at 0 as long as it's switched on.
The other thing is it runs shi!!y for a few seconds when hot like a warmed up engine that's flooded.
I'm almost sure mines a bleeding injector, cold it starts instantly hot is another story.
Try turning on the ing. and listen for the pump to quit running before cranking the engine if it starts right away it's probably the check valve, unless you also have a hot start issue.
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
Ok. So you've already pulled the fuel rail, and verified you don't have a stuck injector. So now you have to determine if the where the fuel is bleeding down....input or return. There are two adapters (J37287-1, -2) that really make short work of troubleshooting this problem. They are not expensive, and available on ebay.
I'm not being cheap, It just that I was supposed to leave Friday to take a quick trip to the mountains this weekend, and it will be NOTHING without the vette, and it would probably be Friday before the adapters arrive; far too late to order what I need to fix the problem.
Tech Contributor
Joined: Jan 2007
Posts: 19,535
Likes: 1,196
From: Dyer, IN
I found the adapters on ebay. Will they allow me to definitely determine whether or not it is the regulator of the fuel pump? Is there any other way to determine without getting them?
I'm not being cheap, It just that I was supposed to leave Friday to take a quick trip to the mountains this weekend, and it will be NOTHING without the vette, and it would probably be Friday before the adapters arrive; far too late to order what I need to fix the problem.
I'm not being cheap, It just that I was supposed to leave Friday to take a quick trip to the mountains this weekend, and it will be NOTHING without the vette, and it would probably be Friday before the adapters arrive; far too late to order what I need to fix the problem.
Thread Starter
Melting Slicks
Joined: Nov 2003
Posts: 3,011
Likes: 9
From: Dublin GA
If I can't find another way to isolate the problem, I am going to have to do somthing to fix the car, whether it's fixed this week or two weeks form now. Will these adapters definitely allow me to determine the problem?
Tech Contributor
Joined: Jan 2007
Posts: 19,535
Likes: 1,196
From: Dyer, IN
Definitely? Not having seen your car, or what you've done to it, I just can't say definitely. What I can tell you, is that I've used the aforementioned shut off adapters to troubleshoot a number of GM vehicles with fuel bleed down problems. They are also specifically mentioned in the service manual to isolate fuel issues.
Someone else may have a creative way to solve your problem...as I'm out of useful information.
Someone else may have a creative way to solve your problem...as I'm out of useful information.
