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Old 09-12-2013, 10:37 PM   #1
mattrubywrx
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Member#: 315635
Join Date: Apr 2012
Vehicle:
04 STi
Aspen White

Default Fuel pump problems (code inside)

hey guys
i own a 2004 STi, mods include: 650cc injectors, headers/up-pipe, TBE exhaust, grimmspeed ebcs, walbro 255lph fuel pump.
This past friday i was at TMP test and tune doing some quarter mile passes, on my way home my check engine light came on and my cruise light began flashing at my. Upon plugging in my code reader, I learned the reason the check engine light came on was due to a fuel related issue. The exact code thrown at me was: p0230 fuel pump primary circut
I have since located the fuel pump relay, and it seems fine, I've also checked out the fuel pump itself (didn't puma it out but took the cover off) and it seems ok as well.
from my research I've began to assume its either the fuel pump control unit, a fuel pump fuse (didn't find one?) or the cars tune.
has anyone had this same code and if so what was the fix? id rather not play chase the code on this one.
thanks guys

ps.
possibly an unrelated issue but; when i hit the gas pedal the car revs up like normal, but gets stuck at 2000rpm or so for a couple seconds on the way back down.

Yes i searched so don't bother "suggesting i do a simple search". I'm looking for anyone with a definitive solution.
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Old 09-12-2013, 11:39 PM   #2
gregorthegift
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Default

If you have an accessport plug that in, I had the same issue, might be a misfire code, that's what mine was when I had the cel and blinking cruise. I had a 2 year old walboro and replaced it with DW 301 and it seemed to help. I've also heard this code being caused by a bad fuel pump assembly gasket, or even a lose or non sealing gas cap.
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Old 09-13-2013, 01:26 AM   #3
five0three
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Join Date: May 2013
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2013 STi 5 Door
PBP

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to verify serviceability of both your fuel pump relay and the pump itself, you would need to disassemble both...
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Old 09-13-2013, 09:39 AM   #4
mattrubywrx
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04 STi
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The relay "clicks" when i turn the key so i figured at least its showing signs of working.
the fuel pump turns on and cycles through when the cars started, after running for about a minuet it begins to idle like **** though
It does seem to miss fire a bit while idling, today for the first time i let it idle crazy and crappy for about 20 seconds and it ended up stalling out.
Im starting to suspect the fuel pump control module.

Last edited by mattrubywrx; 09-13-2013 at 10:02 AM.
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Old 10-09-2013, 07:53 AM   #5
mattrubywrx
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Aspen White

Default

bumpp
anyone?
i replaced the fuel pump control untit, but problem still exists
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Old 07-30-2014, 11:01 PM   #6
geekmonster
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Location: SoCal
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02 WRX Wagon
Silver

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any update? i'm experiencing the same thing with my 02 wrx.
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Old 07-31-2014, 08:58 AM   #7
mattrubywrx
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Quote:
Originally Posted by geekmonster View Post
any update? i'm experiencing the same thing with my 02 wrx.
my problem was my ecu. It was lose and got banged around and likely shorted something out. i replaced the ecu and my problems went away.
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