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Old 06-19-2012, 05:53 PM   #35
yamahaSHO
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Member#: 73932
Join Date: Nov 2004
Chapter/Region: MWSOC
Location: Nebraska
Vehicle:
2005 STi - E85
2004 S2000 - E85

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Quote:
Originally Posted by eliezerrosario View Post
No, the stock fuel pump has the check valve on it....and I believe walbro's also have this "built in" check valve. If you don't have one, it could be the cause for the pressure drops.

Here is a link of what I'm talking about:

http://ken-gilbert.com/wrx/STi_Manua...l%20System.pdf

Look at pages 11 and 12


There's only 10 pages when I load it.

The check valve is in the pump itself and you're likely not getting it out and shouldnd be a restriction.
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