USDM OBDII B18C1 engine. OEM FPR. Victor X intake manifold. When you try and install the stock FPR, you can't because the plenum is too large. So the only way to use it, is to flip it around. So the vacuum line is hooked up, fuel line is hooked up. Car runs 46psi of pressure at idle and 50psi otherwise. That seems really high to me. I was under the impression all B-Series are around 36-42psi with the vacuum line on.

I have a couple theories.

1. The FPR is only suppose to be on one way, and flipping it around is causing a restricting, thus increasing the pressure.

2. A kink in the line. Well I have crossed this off, because there are no kinks in fuel line or vacuum line.

3. Someone suggested the Victor X manifold pulls A LOT more vacuum then stock and causing the pressure to rise. Makes sense, so I have not ruled this out yet.

I'm curious what it is. I don't want to spend the $200 on an Aeromotive regulator, but I will if need be. The B&M obviously won't work. The AEM or similar stock shape won't fit either. Looks like I will need to move to a remote mount. Either way the car runs ridiculously rich now, and I'm trying to figure out the culprit.

Anyone else run into this scenario? Thanks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Hammond &raquo;</TD></TR><TR><TD CLASS="quote">

3. Someone suggested the Victor X manifold pulls A LOT more vacuum then stock and causing the pressure to rise. Makes sense, so I have not ruled this out yet.

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Probably not much help, but the higher the vacuum is the lower the fuel presure will be.

You running a high volume fuel pump? A stock presure regulator cant flow that much.

 

you could have a blockage in the return line

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chiovnidca &raquo;</TD></TR><TR><TD CLASS="quote">Probably not much help, but the higher the vacuum is the lower the fuel presure will be.

You running a high volume fuel pump? A stock presure regulator cant flow that much.</TD></TR></TABLE>

Nope. I upgraded the stock CX pump to a 132lph OEM GSR pump.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mrbsponge &raquo;</TD></TR><TR><TD CLASS="quote">you could have a blockage in the return line</TD></TR></TABLE>

You mean like a deposit in the line? Brand new fuel filter and no kinks in any rubber lines.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mr Hammond &raquo;</TD></TR><TR><TD CLASS="quote">You mean like a deposit in the line? Brand new fuel filter and no kinks in any rubber lines.</TD></TR></TABLE>
An easy way to check for a restricted return line is to check the fuel pressure with the hose disconnected from the pressure regulator. You'll need a container to catch the fuel so you dont start a fire.