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Old 02-11-2013, 08:42 AM   #1
gtx matt
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Member#: 342822
Join Date: Jan 2013
Default Fuel Pump Controller - Whats it do?

Hi everyone,

I'm new to owning a WRX, and seem to be running out of fuel under boost. When I picked this car up it would practically stall if you tried to get it above 3500 rpm or so. The cars been sitting for a while, so I changed the plugs, fuel filter, drained the gas, and added fresh gas (suspected water in old gas)

I took the car for a ride and managed to blast through first and into second, but after that it still wanted to break up when I tried to get on it again (although it just broke up, didn't completely shut down).

The fuel pump is aftermarket (I assume a Walbro 255 but not confirmed) and NOISY, constant whine at idle. I haven't checked fuel pressure yet, I intend to do so tonight. Anyway, I'm thinking I've still go a fuel supply issue.

What exactly does the fuel pump controller do? And is there a way to test it?
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Old 02-11-2013, 02:30 PM   #2
DZXN
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Member#: 306186
Join Date: Jan 2012
Chapter/Region: SCIC
Location: Costa Mesa
Vehicle:
2002 Subaru WRX
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What year car, mods & tune(map) currently on the car, and you should check for codes. With that information people might be able to help. Do you have a boost gauge/AP to see what you are boosting too? Without more info its a poop shoot if the internets can help. Could you have a leak in the BCS system that is causing overboost and then fuel cut?

Walbro shouldn't be NOISY noisy, might be an issue in the connections in the tank, etc. If you have a fuel issue don't assume things about a pump because someone told you or you are guessing. Pull it and see. If it is janky, hooked up wrong, or not working you might have found your problem.

A fuel pump controller = a relay that controls when the fuel pump turns off or on, thus helping regulate fuel pressure.
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Old 02-11-2013, 03:28 PM   #3
gtx matt
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Alright thats kind of what I assumed but wasn't sure.

Car has a VF39, turbo back, no cat, STI pinks, cold air intake, front mount.

It feels very much like fuel cut to me, the boost gauge is in a stupid pod where the clock went before. While nice looking, I can read it when I'm driving fast. I'll see if a buddy will go for a ride later on and get a reading on it.

Check engine light is on also (what a surprise), also currently trouble shooting that issue as I have a lack of power or ground to the OBDII port so i can't scan (I know I know do that first, just getting anxious to get home and mess with this thing)
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Old 02-11-2013, 04:57 PM   #4
DZXN
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Member#: 306186
Join Date: Jan 2012
Chapter/Region: SCIC
Location: Costa Mesa
Vehicle:
2002 Subaru WRX
PSM

Default

You have a vag-com and 02-03 I'm guessing. If you have those 2 things and want to log bottom of the page has jumper pictures. Jump both and you can log.
http://forums.nasioc.com/forums/show...tactrix&page=7

I hope someone else might help, but I think that 1086 code will put you in limp mode. If I remember correctly it keeps you from beating on the motor by fuel cut. Not positive though.

If you are just using a code reader it might need to be set to power up the connections shown in the link to read your ecu/code.

And again, what year is your car?
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Old 02-12-2013, 01:36 AM   #5
gtx matt
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Sorry its an 02, and my scanner is a TopTak. Its not a datalogger, just a scanner and gives some other readouts like throttle angle, manifold pressure, coolant temp, air temp, rpm, ignition timing, O2 sensor voltage, and I believe MAF voltage. Unfortunately it only reads at one point in time.

I found a broken wire at my OBDII port, so I gotta fix or rig it to work with the scanner.

Anyone know if its easy to find the correct pins to fix this right, instead of the generic ones that never seem to fit anything right?
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