ok now what is it?
Thread Starter
Instructor
Joined: Apr 2008
Posts: 240
Likes: 0
From: Peachtree City GA
ok now what is it?
After replaceing my injectors, puting my plenum back together, Seeing i had a leak on the rail. I took it back down replace all of the seals.
This time i decided to test the rail before I put everything back together ( like the Instructions Said).
Well i get pressure up to 45PSI with no leaks, but instanly in drops to 20 psi ( 2 SEConds) and then over the Next 3 to 4 seconds it drops to ( ZERO) does this mean the fuel pressure regulator is bad? Please help.
Thanks RTE
This time i decided to test the rail before I put everything back together ( like the Instructions Said).
Well i get pressure up to 45PSI with no leaks, but instanly in drops to 20 psi ( 2 SEConds) and then over the Next 3 to 4 seconds it drops to ( ZERO) does this mean the fuel pressure regulator is bad? Please help.
Thanks RTE
Thread Starter
Instructor
Joined: Apr 2008
Posts: 240
Likes: 0
From: Peachtree City GA
Thread Starter
Instructor
Joined: Apr 2008
Posts: 240
Likes: 0
From: Peachtree City GA
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
From memory
you get the presure up , clamp supply line from pump line and see if pressure drops.If no drop, leak is on supply line.
If pressure still drops , pressurise and clamp return line.If pressure now holds, the FPR is leaking down
Check the vac line to the FPR for fuel, FPR diaphram may be broken
you get the presure up , clamp supply line from pump line and see if pressure drops.If no drop, leak is on supply line.
If pressure still drops , pressurise and clamp return line.If pressure now holds, the FPR is leaking down
Check the vac line to the FPR for fuel, FPR diaphram may be broken
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Another fuel pressure loss area is the fuel pulse dampener, directly aboove fuel pump.
Diagnosis >>> http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf
Diagnosis >>> http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf
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Thread Starter
Instructor
Joined: Apr 2008
Posts: 240
Likes: 0
From: Peachtree City GA
Another fuel pressure loss area is the fuel pulse dampener, directly aboove fuel pump.
Diagnosis >>> http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf
Diagnosis >>> http://members.shaw.ca/corvette86/Fu...mDiagnosis.pdf
Hummm Maybe i should put the distributor back in before i go any farther.
Thank you for the document A86
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
The check valve is integral to pump. You could pull the supply line from top of pump, put a piece of hose onto nipple and blow. Might give you an idea of how well the check valve and pulse dampener are sealing.
Thread Starter
Instructor
Joined: Apr 2008
Posts: 240
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From: Peachtree City GA
Excuse my ignorance, But if the check is bad... Therefore the pump is useless right?
Melting Slicks
Joined: Feb 2005
Posts: 2,135
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From: Sebastian Florida
St. Jude Donor '06
If you got the pump a month ago, take it back.
What brand did you get?
Is it a universal?
Did you check FP after replacing the pump?
Did you do the 2nd test and clamp the return line?
The dampner is on the feed line, that could be bad or not on correctly and not the check valve/pump.
What brand did you get?
Is it a universal?
Did you check FP after replacing the pump?
Did you do the 2nd test and clamp the return line?
The dampner is on the feed line, that could be bad or not on correctly and not the check valve/pump.
Thread Starter
Instructor
Joined: Apr 2008
Posts: 240
Likes: 0
From: Peachtree City GA
If you got the pump a month ago, take it back.
What brand did you get?
Is it a universal?
Did you check FP after replacing the pump?
Did you do the 2nd test and clamp the return line?
The dampner is on the feed line, that could be bad or not on correctly and not the check valve/pump.
What brand did you get?
Is it a universal?
Did you check FP after replacing the pump?
Did you do the 2nd test and clamp the return line?
The dampner is on the feed line, that could be bad or not on correctly and not the check valve/pump.
If i clamp the Feed line, it make some differnce, it drops slower. if i clamp the return line it makes NO Change. I continued to cycle the pump On and off, maybe 10 times, it still drops pressure, but at a much slower rate, ( with out clamp) I would say, 60 seconds from 40 psi to 30 psi, it still leaks all the way down. I took the Feed line off and trid to blow thru the Pump, But that wasnt happing.... I got no air back to the tank. not by lung pressure.
how long should it hold the 40 PSI, Should it be indefinte? or do they all leak down?
Where would the damper be any way all i see is hard line to the filter and from there to the rail?
Last edited by rte203; May 2, 2009 at 05:42 PM.
Team Owner
Joined: Jan 2003
Posts: 20,324
Likes: 250
From: Summerland B.C. Canada
Don't sweat it. My pressure would drop to zero with in minutes and I noticed no driving or starting problems. My loss was a the pulsator. I removed it and replaced it with a piece of fuel injection hose and 2 clamps, all good now.
You may want to do the same, just to rule it out.
You may want to do the same, just to rule it out.
Thread Starter
Instructor
Joined: Apr 2008
Posts: 240
Likes: 0
From: Peachtree City GA
Don't sweat it. My pressure would drop to zero with in minutes and I noticed no driving or starting problems. My loss was a the pulsator. I removed it and replaced it with a piece of fuel injection hose and 2 clamps, all good now.
You may want to do the same, just to rule it out.
You may want to do the same, just to rule it out.
