Is this normal fuel pressure with walbro?
Joined: Sep 2011
Posts: 424
Likes: 43
From: Oklahoma
G35
Fuel pressure too high?
A buddy said my fuel pressure was high...(66-68psi looks like) I have a Walbro GSS342 pump purchased from Injected Performance, ID725's from T1 and a fuel pressure gauge adapter w/ direct reading gauge. Stock fuel system other than that... What you think? Anything to worry about? This is @ idle...
Last edited by joeb1983; Oct 6, 2013 at 08:46 PM.
Joined: Sep 2011
Posts: 424
Likes: 43
From: Oklahoma
G35
Is there another mod that needs to be done other than trimming the tabs on the pump inself? I followed a thread on the install of the pump to the "T", but I read elsewhere today about a fuel pump hanger mod to achieve proper flow, but searchng for that mod it brings up return sytems. Heres what Injected Performance states on there listing for the pump;
"Your factory fuel pump hangar will require minor modification to achieve the correct fuel flow"
"Your factory fuel pump hangar will require minor modification to achieve the correct fuel flow"
Joined: Sep 2011
Posts: 424
Likes: 43
From: Oklahoma
G35
Found this, so it looks like I may have missed a couple things... 
http://blog.cj-motorsports.com/2011/...tallation.aspx
http://blog.cj-motorsports.com/2011/...tallation.aspx
A buddy said my fuel pressure was high...(66-68psi looks like) I have a Walbro GSS342 pump purchased from Injected Performance, ID725's from T1 and a fuel pressure gauge adapter w/ direct reading gauge. Stock fuel system other than that... What you think? Anything to worry about? This is @ idle...
Joined: Sep 2011
Posts: 424
Likes: 43
From: Oklahoma
G35
Performed the swirl jet and regulator mods per CJ Motorsports instructions in the link above. Fuel pressure @ idle is now a steady 56psi instead of the slightly fluxing 70psi it was at before. The Haynes manual states fuel pressure should be anywhere between 53 - 63psi so, Good to go! 
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Performed the swirl jet and regulator mods per CJ Motorsports instructions in the link above. Fuel pressure @ idle is now a steady 56psi instead of the slightly fluxing 70psi it was at before. The Haynes manual states fuel pressure should be anywhere between 53 - 63psi so, Good to go!
An external FPR should read in the 40s with all the vacuum line connected. If the pressure is set to 50 with the line connected I would suggest removing it and verify the reading then reconnect.
Joined: Sep 2011
Posts: 424
Likes: 43
From: Oklahoma
G35
I'm still rocking the oem FPR in the tank/pump housing as I did not convert it to a return style system. Not over 400whp (334whp on a Mustang dyno, so roughly 370ish on a DynoJet give or take) due to it being a stock bottom end, so no need to spend the $ and convert... The direct reading gauge is just installed on an sandwhich style adapter. Like AAM's. That thing that looks like a FPR above the gauge is actually a "fuel pulse damper".
I drilled the swirl jet out to .070 with a #50 drill bit (had to order) and the oem FPR with a 7/64" bit per CJ Motorsports directions. Worked like a champ and my tuner said perfect! Now we can dial in those AFR's.
I drilled the swirl jet out to .070 with a #50 drill bit (had to order) and the oem FPR with a 7/64" bit per CJ Motorsports directions. Worked like a champ and my tuner said perfect! Now we can dial in those AFR's.
Last edited by joeb1983; Oct 12, 2013 at 05:37 PM.
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