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Old 01-19-2005, 04:42 PM   #1
burton1181
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Angry HELP!!! Fuel Pressure Problem!!!!!!!!

Ok so here's my situation. We recently put in a VF22, Walbro fuel pump, and Sti Pinks on my 02 WRX. For some reason my Fuel Pressure isn't adjusting propperly. It is reading on my gauge at a little above 3bar which is correct. As the car boosts up, the pressure goes up a little but just bearly. At first I thought the gauge was messed up but we clamped the fuel intake hose and it jumped right up to 6bar, so the fuel pump is working, then we blew air into the back of the fpr at 1 bar and sure enough it went up on the gauge so the gauge isn't messed up. So we replaced the fpr and it didn't do anything there either. we hooked up a boost gauge to see if the pressure was goign up and it went up exactly as it should. So it has the pressure coming in and going out... I have no idea what I could check now... We used Ecutec and were able to push in enough fuel but we were only putting about 250 to the ground. PATHETIC! Any suggestions?
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Old 01-19-2005, 05:13 PM   #2
Kingpin
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This was a very odd situation. Typically you see 38 psi at idel so this is a bit high. 3 bar is 44. The fuel was there for the tune but the IDC's were soming up as yopu can imagine. This seems very odd and maybe we are just missing something stupid here. But as stated we checked that the pump could flow enough. Pinched the return during a run and it made tons of fuel pressure. 1 bar of compressed air into the regulator and it made 1 bar of fuel pressure. Put a boost gauge in line between the manifold and the regulator and it is seening the same boost as the incabin gauge 1-1.2 bar. SO there is pressure coming out of the manifold. When there is pressure on the regulator it works and there is more than enough pump. We used the sotck vacuum hose in lone during all testing. No leak there. Any ideas?

BTW: Problem with power unrelated. AFR was at 10.8. Plugs have had a hard life and have never been replaced with 30,000. When replaced I exspec this to pick right up. Never the less it is an odd problem that needs to be fixed. THanks.

M
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Old 01-20-2005, 04:48 PM   #3
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bump... too curious.
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Old 01-20-2005, 06:12 PM   #4
fatray
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I get 39psi at idle and around 75psi at WOT full boost.

You do the conversion to bar
http://www.onlineconversion.com/pressure.htm
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Old 01-20-2005, 09:00 PM   #5
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Have you checked the fuel filter? Sounds like you are able to get pressure in a no load situation, but when you load it things can't keep up. Just a thought.
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Old 01-21-2005, 12:05 PM   #6
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Run a hose directly from the intake to the regulator with no tees of any kind and see what happens
Mike
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Old 01-21-2005, 01:53 PM   #7
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I don't think it would be the fuel filter because if the fuel pressure went up after we clamped it I don't think the fuel filter would have the problem. We actually did run a hose directly from the intake to the regulator with only one tee to the gauge to make sure and it worked fine.... crazy lil problem I have here. What do you think?
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Old 01-21-2005, 02:00 PM   #8
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if anyone wants to go ahead and give me a little bump that would be aweful nice of yall, this problem sucks and I really wanna get it fixed. As for the Hose from the intake to the regulator its not tee'd into at all cause its only like 2 inches long... Still don't know what the prob is
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Old 01-21-2005, 03:34 PM   #9
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Quote:
Originally Posted by burton1181
I don't think it would be the fuel filter because if the fuel pressure went up after we clamped it I don't think the fuel filter would have the problem.
no, that's not what you tested; you tested the ability of the fuel pump to produce pressure at ZERO FLOW. what you need to test the filter is the pressure drop caused by restriction at FULL FLOW.

hth
ken
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Old 01-21-2005, 03:41 PM   #10
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75psi is normal at full boost?
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Old 01-21-2005, 03:52 PM   #11
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Quote:
The Stock FPR is a 1 to 1 ratio. This means for every 1 psi of boost pressure you run you will increase the fuel pressure by 1 psi. Boost pressure starts at 0 on the vac or boost gauge. At zero the pressure should be static or 43 psi give or take 2 psi. If you run 10 psi of boost the pressure shoots up to 53 psi. 20 psi of boost? 63 psi.
Here is a quote from this thread...
http://forums.nasioc.com/forums/showthread.php?t=480255
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Old 01-21-2005, 09:36 PM   #12
burton1181
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I just really have a hard time believing that the fuel filter would ristrict it that much... and even with clamping the return hose it still built pressure.. and then we tee'd into the hose b4 and after the fpr and it still boosted up. then we thought it would be the gauge but as we put 1 bar of pressure in the tube it registered 100%
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Old 01-22-2005, 12:05 AM   #13
fatray
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Change the filter, I can't believe you haven't tried something that simple yet. Worth a try isn't it? How many miles on your car? The manual says replace every.... I can't find the manual.

Trying something so cheap is better then trying nothing at all.

Last edited by fatray; 01-23-2005 at 12:47 AM.
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Old 01-22-2005, 03:05 PM   #14
burton1181
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I just have a hard time believing that would be the problem... Everyone pray for me that thats the reason!!!! FRUSTRATING!!!!!!!!
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Old 01-28-2005, 11:01 PM   #15
fatray
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I just read another post with your problem; a mechanic said the screen covering the fuel pump was clogged. This was a diagnosis and not confirmed yet.
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Old 02-02-2005, 04:53 PM   #16
burton1181
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NOPE!!! G DAMNlT.... We changed the fuel pump and still nothing... I have absolutly no idea now... what a crappy problem to be having. OH well I guess it could be worse.
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Old 02-13-2005, 03:24 AM   #17
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do u have a vacuum leak? ...just an idea
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