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Discussion Starter #1 (Edited)
I'm guessing that when there is vacuum, the FPR draws out fuel but my question is: does it pressurize the fuel rail under boost? The reason I'm asking is because I suspect a vacuum leak in the VSV before the FPR so I've disconnected it and plugged it. I want to go for a test drive doing some hard runs but I don't want to do that if disconnecting the FPR will lean out the fuel system under boost.

Also, can the VSV for the EGR and the VSV for the FPR be used interchangeably? I wanna try swapping the two if they are, in fact, the same.

Thanks,

Jason L.

note: To monitor my engine I have an EGT gauge and a knock monitor via S-AFC II which uses one of the OEM knock sensors.
 

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you could remove the vsv, the vaccum source increases fuel pressure under boost, i would leave the line hooked up to it

i would bypass the vsv, and yes they are the same
 

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Discussion Starter #4
Oh great! thank you.
Why does it use a VSV in the first place?
Thanks,

Jason L.
 

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increase fuel pressure on start up, so start up is easier. alot/most guys remove em.
 
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