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Old 05-08-2002, 10:04 AM   #1
Scooby Specialist
Member#: 5349
Join Date: Mar 2001
Location: Central New York
Default Proper Fuel Pump for GC8

<<< Update! - Installed - pictures of install at bottom. >>>

I'm looking for the proper upgrade walbro fuel pump for a ~7 psi boosted RS 2.5.

I read another thread on our club and talked to the nice guy at:

"Auto Performance Engineering" <[email protected]>

Here's what he had to say about the Walbro I picked out.

< The problem with the Impreza/WRX is the
< pickup filter. Walbro doesn't have a filter with that long
< neck and same angle. The engineering folks I talk with
< recognize the market for those cars, but they don't
< get to make what they feel is popular, management gets
< to decide what is produced.

< From what I've heard, folks are buying the Walbro pump
< and a new Subaru filter from the dealer.

< The pump you need is the GSS317 or GSS342.
< The kit you ordered contains a GSS317. Most folks
< buy the GSS342. Do you know what fuel pressure
< you run? If you don't run over 60-65 psi, then the GSS317
< will be no different than a GSS342. The GSS342 flows
< more fuel above 60-65 psi, but if your system never sees
< fuel pressure that high, then it's a waste of money.

< Divide you engine horsepower number by 12.
< That is the gal/hr of fuel your engine requires.
< Go to the in-tank page on my WWW site and find
< the pump that can supply at least that flow rate at
< your max fuel pressure.

Can someone tell me what:
1. Roughly what stock pump fuel pressure is
2. Which Pump I should buy - recommendations?
3. Whats the filter from the dealer he's talking about
4. I will be running 440cc injectors so I shouldn't need high pressure as much as flow correct? Teach me.

Thanks All
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Last edited by Joncas; 05-19-2002 at 02:21 AM.
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Old 05-08-2002, 10:33 AM   #2
NASIOC Supporter
Member#: 246
Join Date: Sep 1999

I THINK stock fuel pressure is 33 and at WOT its 40, but its been a long time so I'm not sure. Sorry can't help you on the other items
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Old 05-08-2002, 11:47 AM   #3
Scooby Specialist
Member#: 1676
Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
98RS w/ EJ257/Dom
2014 Tesla Model S P85


I can tell you the stock FP on my '98 RS is 28-30psi at idle and ~34-35 @ WOT.
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Old 05-08-2002, 03:15 PM   #4
Scooby Specialist
Member#: 11931
Join Date: Nov 2001
Location: Winter Park, FL/ SMU @ Dallas,
2001 2.5 RS Turbo


My MY01 RS pushes around 33-34 psi at idle and close to 38 at full throttle.

Unless you plan on buying an adjustable baseline fuel pressure regulator, get the the lower pressure pump so that your FP isn't 51 psi at idle, like mine is now.

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Old 05-08-2002, 04:13 PM   #5
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Member#: 1109
Join Date: Mar 2000
Chapter/Region: MAIC
Location: Reston, VA
1999 Suzuki Samurai



You ordered the 317, that's the right one.
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Old 05-19-2002, 02:24 AM   #6
Scooby Specialist
Member#: 5349
Join Date: Mar 2001
Location: Central New York

Got the GSS317. Works great. Installed easy. Be cafeful not to bend the float (metal hanger with plastic box on the end) or you'll mess up your gas guage's accuracy.

All important install shots here.
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