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Old 10-11-2007, 08:38 PM   #1
Spitulski
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Member#: 111667
Join Date: Apr 2006
Chapter/Region: NWIC
Location: Vancouver, WA
Vehicle:
2002 Impreza 2.5RS
Platinum Silver Metallic

Default High Flow vs. OEM fuel pump?

Kind of a spin-off from the car won't start thread - problem's been diagnosed as an intermittently crappy fuel pump that needs to be replaced.

I have an 02 2.5RS, which - from what I can find - has a 190 Liter per hour fuel pump as OEM equipment. An OEM replacement, at best, appears to be $300 or so. A Walbro 255LPH replacement is under $100, making it the most cost effective replacement I can find.

Question - are there any ill side-effects if I upgrade to 255LPH on what is basically a bone-stock engine with an aftermarket exhaust system? I've read that the FI system that Subaru uses will only run the fuel pump for the amount of fuel needed, and that the extra LPH will basically never be used and will not affect engine performance...I'd like to verify that before going ahead with the installation.

Thanks!

Spit
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Old 10-11-2007, 08:59 PM   #2
mattwalters
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1998 Legacy 2.5GT
Rio Red

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Consider it verified. The extra flow will be bled off by the FPR at the end of the fuel rail and sent back to the fuel tank. Le voila!

-Matt
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Old 10-12-2007, 01:25 AM   #3
Patrick Olsen
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1997 Legacy 2.5GT
QuickSilver Metallic

Default

The only downside is that you're pumping more fuel through the system that you need and thus recirculating more than you would with the stock pump, so theoretically the fuel will be warmer. Warmer fuel = less dense = less energy being injected with each pulse of the injectors.

Would you ever notice the difference? Almost certainly not.

As for replacement pumps, does Walbro not make a 190 for these cars? I know for my trusty ole 5.0 Mustang the stocker was an 88, and one could buy 110, 155, 190, and 255lph pumps from Walbro that were all direct replacements for the stock pump.
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Old 10-12-2007, 02:33 AM   #4
PhilSine
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Join Date: Oct 2006
Chapter/Region: MWSOC
Location: Superior, WI
Vehicle:
02 WRX Wagon (WRB)
98 OBS-T, 91 Legacy SS

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Why not buy a used WRX pump on the forums here for like $40 or so? It's a direct drop-in.
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Old 10-12-2007, 12:31 PM   #5
Spitulski
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Location: Vancouver, WA
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2002 Impreza 2.5RS
Platinum Silver Metallic

Default

Thank you all for the information...I might do that Philsile, if I can find one that I can pay for. I don't have, nor do I intend to sign up for, Paypal...thus why I started looking at vendor availabilities first.

Cheers,

Spit
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