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Old 12-21-2011, 03:11 PM   #1
AsphaltsCry
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Default bad FPR or pump?

relatively stock ej20g from 95 WRX RA.

extended crank on startup. priming pump once greatly improves results.
walbro pump seems a bit quieter than it used too. it's 5 years old

will check pressure later today. filter is pretty new

basically, how do i diag whether it's the FPR or the check valve in the pump bleeding down?

thanks in advance
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Old 12-21-2011, 04:46 PM   #2
AsphaltsCry
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So pressure gauge in line after filter. Koeo 40, then drops right back to zero. Koer 30, and rises with revs. Disconnect vacuum from fpr, pressure rises.

Sounds like the pump, what do y'all think?

New walbro's easier to get and replace, but how do i know for sures?
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Old 12-22-2011, 07:18 PM   #3
AsphaltsCry
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damn...

all the wiseasses on here and nobody has something to say?!

where's that unclescotty when you need him... or Rob

-jami
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Old 12-23-2011, 12:07 PM   #4
TommyAtomic
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Quote:
Originally Posted by AsphaltsCry View Post
So pressure gauge in line after filter. Koeo 40, then drops right back to zero. Koer 30, and rises with revs. Disconnect vacuum from fpr, pressure rises.

Sounds like the pump, what do y'all think?

New walbro's easier to get and replace, but how do i know for sures?
I could swear that your initial base fuel pressure should be 43psi and that it should rise with revs . So yes you should be looking at replacing your walbro. What is Koeo and Keor ?
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Old 12-23-2011, 12:39 PM   #5
AsphaltsCry
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Koeo- key on engine off
Koer- key on engine running

I thought the pump was for sure quieter, coupled with a lower pressure than spec, condemns it I suppose

Thanks
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Old 12-24-2011, 05:46 AM   #6
newblue
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I will say I had similar symptons and it ended up being my FPR.
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Old 12-24-2011, 06:02 AM   #7
AsphaltsCry
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I wonder if the difference between the two failures is which end of the fuel system the pressure loss takes place.

The check valve is at the beginning of the supply side, while the fpr is at the beginning of the return

Perhaps if I clamped off the return, then put the key to on, while monitoring pressure, the outcome would indicate which.

If the pressure remains=fpr and if the pressure still drops= check valve in fuel pump.

Moot point as I just ordered a new walbro...
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Old 12-26-2011, 06:49 PM   #8
AsphaltsCry
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Still waiting on the new pump, however just out of morbid curiosity, i measured pressure again, with the return line clamped next to the filter and to my dismay, the pressure not only remained, but jumped to 65 or 70.

This seems to confirm a fpr failure...

Buehler... bueler... anyone?
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Old 12-27-2011, 12:00 AM   #9
suberdave
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that would explain the fuel pump getting less loud...

if it is pumping less pressure it will not be as loud as if it is pumping agenst a good FPR at a higher pressure.

i say you should have done this test before ordering a new pump.

-=Suberdave=-
www.suberdave.com
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Old 12-27-2011, 12:06 AM   #10
AsphaltsCry
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No $hit.

Too bad peeps always chime in to confirm a hypothesis I've already tested...
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Old 01-05-2012, 07:38 AM   #11
wagonryan
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Look on the bright side: you solved my problem too.

Which fpr do you replace it with?
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Old 01-07-2012, 07:52 AM   #12
AsphaltsCry
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I used my old 1.8
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