 
     |
| No fuel pressure to test port on fuel rail but good pressure from pump when disconnec (Page 2/3) |
|
Steelers8
|
JUL 06, 09:04 AM
|
|
|
70 before fuel filter not connected to anything but pump. If connected to fuel filter 10 before and after and no pressure at rail.
|
|
|
|
Mike in Sydney
|
JUL 07, 06:27 PM
|
|
| quote | Originally posted by Steelers8:
70 before fuel filter not connected to anything but pump. If connected to fuel filter 10 before and after and no pressure at rail. |
|
I've been scratching my head on this. How are you measuring pressure between the pump and the fuel filter? Is there a Schrader valve in the line, there? Can you upload an image?
|
|
|
|
Steelers8
|
JUL 07, 08:10 PM
|
|
|
I have pressure now. It will only start and go up to 1100 rpms and dies. Sounds like maybe a vacuum leak. Any ideas were to start? ------------------
KCBSR
|
|
|
|
Spoon
|
JUL 07, 08:28 PM
|
|
| quote | Originally posted by Steelers8:
70 before fuel filter not connected to anything but pump. If connected to fuel filter 10 before and after and no pressure at rail. |
|
So just to clear things up I'm assuming you mean 70 psi. I'm assuming you're dead-heading the fuel pump with a reliable gauge before any fuel gets to the 1st component being the fuel filter. If this is so, then you've proved that the fuel pump is capable of producing adequate static-pressure but that does not always equal adequate dynamic-pressure or flow / volume.
If I was in this situation I would use a pressure gauge of the proper range, an appropriate ball valve to regulate the pressure and a measuring container to collect the results and compare this to the manufacturers specifications of the pump. Example, 1.5 gallons per minute @ 55 psi.
Once the pump has proven itself then I would add in the fuel filter and retest. If all proves well then I would allow fuel to flow to the regulator and so on.
I would also recheck the schrader valve on the fuel rail. The core could be bent off center and its not being depressed. Replacements are available for fuel use.
---end of "If I was in this situation". Just like on TV, results may vary...
Spoon
------------------
"Kilgore Trout once wrote a short story which was a dialogue between two pieces of yeast. They were discussing the possible purposes of life as they ate sugar and suffocated in their own excrement. Because of their limited intelligence, they never came close to guessing that they were making champagne." - Kurt Vonnegut
|
|
|
Patrick
|
JUL 07, 09:03 PM
|
|
| quote | Originally posted by Steelers8:
I have pressure now.
|
|
Tell us what you did.
|
|
|
|
Steelers8
|
JUL 07, 09:13 PM
|
|
|
Well took fuel pump assembly out and put in a bucket of gas so now good fuel pressure at fuel rail. It starts but only goes to 1100 rpm and dies. Sounds like maybe a vacuum leak! Any idea where to start looking? Everything is hooked up. New intake gaskets. Could it be there or idle sensor? ------------------
KCBSR
|
|
|
|
Steelers8
|
SEP 02, 08:58 PM
|
|
|
Well put new intake gaskets in and no more vacuum leak but it is timed now but will not idle. Starts but as soon as I take my foot off the brake it dies. Can’t even put in reverse to back out of the garage. Any ideas please! ------------------
KCBSR
|
|
|
|
Patrick
|
SEP 02, 09:05 PM
|
|
What is the fuel pressure at the schrader valve on the fuel rail?
|
|
|
|
Steelers8
|
SEP 02, 09:18 PM
|
|
|
43 lbs ------------------
KCBSR
|
|
|
|
Dennis LaGrua
|
SEP 07, 08:35 AM
|
|
| quote | Originally posted by Steelers8:
Well took fuel pump assembly out and put in a bucket of gas so now good fuel pressure at fuel rail. It starts but only goes to 1100 rpm and dies. Sounds like maybe a vacuum leak! Any idea where to start looking? Everything is hooked up. New intake gaskets. Could it be there or idle sensor?
|
|
I would advise against using live wires and testing the pump in a bucket of gasoline. Quite frankly I cannot even see how you can measure the pressure this way. What was the procedure? If you now have 43 psi at the rail then fuel pressure is up to spec. This whole episode sounds extremely strange. ------------------
" THE BLACK PARALYZER" -87GT 3800SC Series III engine, custom ZZP /Frozen Boost Intercooler setup, 3.4" Pulley, Northstar TB, LS1 MAF, 3" Spintech/Hedman Exhaust, P-log Manifold, Autolite 104's, MSD wires, Custom CAI, 4T65eHD w. custom axles, Champion Radiator, S10 Brake Booster, HP Tuners VCM Suite.
"THE COLUSSUS"
87GT - ALL OUT 3.4L Turbocharged engine, Garrett Hybrid Turbo, MSD ign., modified TH125H
" ON THE LOOSE WITHOUT THE JUICE "
|
|
|
