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Old 01-24-2005, 06:00 PM   #1
burton1181
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Member#: 79870
Join Date: Jan 2005
Location: Arizona
Vehicle:
02 WRX
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Subaru Stars Fuel pressure

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 01-24-2005, 08:27 PM   #2
bboy
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Join Date: Mar 2004
Chapter/Region: NWIC
Location: Seattle, WA
Vehicle:
04 Improved STI
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You have done everything I would do. If you are getting boost pressure to the FPR and fuel pressure is not rising, it's got to be the FPR since you have shown that the lines will hold to 6 bar.

You say you swapped the FPR, did you install it, or something else? (can't believe it's not an FPR issue).
When you checked that boost was getting to the FPR did you use the same line that runs to the FPR nipple? (wondering about leak in boost line)
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Old 01-25-2005, 03:13 PM   #3
burton1181
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We put a new stock FPR in thats what we can't understand. We used the same line that rant to the FPR. We tried pretty much everything. Spent like 4.5 hours at the dyno scratching our heads, while I was around cursing and other things. I think I might throw a new fuel filter in just for kicks, though I seriously doubt that it will be the problem. I figure it won't hurt.
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Old 01-26-2005, 05:34 PM   #4
aatsi
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Join Date: Feb 2004
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hello boys!!! I,am from finland and not sure how to tell you this right!!!
I had the same problem in my legacy 200 turbo my94.
problem was in fuelpump(walbro 255 high pressure)!
Pump it self works right, but the "back kick" (hope it,s the right word) was wrong! You can see "back kick" when you get the fuel line out of the pump!
I don`t have it anymore in my fuel line! It works!!!!
Mean the part what keeps the pressure in fuel line, when engine is stopped!
hope you can make the boxer work!
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