Ever since upgrade from my stock 92 Si Fuel pump to a 255lph Walboro unit my fuel pressure has been dangerously high(55-60psi at idle) and my FPR will not bring it down any lower! I have also tried the FPR trick on the Endyne website to help relieve more pressure from the system, still staying strong between 55-60 psi! So I am wondering:
1. Should I go back to the stock OEM fuel pump?

2.What size fuel pump is the OEM unit for a 92-95 Civic Si HB(D16Z6 original motor)?


Here is my setup if this helps:

EG Civic HB
B18A Block/ B18B Head
-Mild PnP
-Crower 404 w/ JG Cam Gears
-Crower Valvesprings
-Ferrea SS Valves
-Cometic Head Gasket
-Skunk2 Mani
-64mm TB
-Modified Iceman intake
-JDM ITR 4-1 header w/ 2.5" collector
-No Cat
-2.5" custom piping and exhaust
-P30 B16 Pistons
-Stock Rods
-GSR Tranny w/ LSD
-Exedy Flywheel
-Clutch Specialties 6-puck clutch
-H22 injectors
-Walboro 255lph fuel pump
-SAFC2
-Chipped P75

 

http://www.theoldone.com/articles/regulator/

This should solve your problems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">http://www.theoldone.com/articles/regulator/

This should solve your problems.</TD></TR></TABLE>

I already did that and it did nothing! Still sits at 60psi at idle!

 

Try opening the hole larger then.

 

Wondering if I should or not! Do not want to damage the FPR!

 

try gettin the B&M fuel pressure modifier.

 

Is the fuel return line kinked?
What the pressure if the hose is off the fpr?
Needle in the gage stuck?
If you removed the B&M top part before drilling, did you reinstall the o-ring correctly?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">Try opening the hole larger then.</TD></TR></TABLE> Don't do it

I think the problem is in the fpr. Even with a stock fpr the pressure won't be that high.
I'm just shooting out possibilities. Keep us posted.

 

He is running a high fuel pressure pump, and he is using a FPR that can not lower FP only increase it.

Of cource its going to be higher than stock

A larger hole is just going to alow more pressure to be bled off.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">He is running a high fuel pressure pump, and he is using a FPR that can not lower FP only increase it.

Of cource its going to be higher than stock

A larger hole is just going to alow more pressure to be bled off.</TD></TR></TABLE>

said it before i can!

i had this problem before
sell that pump and get the other or try a real fuel pressure regulator

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by StyleTEG &raquo;</TD></TR><TR><TD CLASS="quote">he is using a FPR that can not lower FP only increase it. </TD></TR></TABLE>
What fpr is being used?

 

one like a cheap b&m
thats why he tried to mod
(drilling a hole to bleed off pressure)

but when u make the hole too big u lose flow and by then u have damage the fpr

 

That's what I thought. I drilled a .032" hole in my fpr with adj b&m. I run 50 psi (hose off)/ 40 psi (hose on). I run a walbro 255 w/no problem. I still think the problem is in the fpr.

 

Well I put the stock Fuel pump back in lastnigh and my fuel pressure went down to 20psi. So I turned it up and highest it would go was 40 with the hose off and it sits at 36 with the hose on! I think where I modded the FPR now it will not hold high pressure!

 

you need a fpr with a big return orifice (aem, aeromotive, sx, etc) the b&m (stock) cannot return enough fuel, and this is causing too much pressure at the rail. my opinion? buy a aem regulator.

hint for everyone else running naturally aspirated: stop buying 255 lph pumps, its way overkill. the 190lph will support more horsepower than you will ever, ever be able to make.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TECH43 RACING INC. &raquo;</TD></TR><TR><TD CLASS="quote">
hint for everyone else running naturally aspirated: stop buying 255 lph pumps, its way overkill. the 190lph will support more horsepower than you will ever, ever be able to make.</TD></TR></TABLE>

I know this now! I was told to run the 255lph when I was spraying my old motor!

What size is the OEM Fuel Pump?

Thanx

 

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

I know this now! I was told to run the 255lph when I was spraying my old motor!

What size is the OEM Fuel Pump?

Thanx </TD></TR></TABLE>

not sure on flow rates, call john @ rc, he'll know. 310-320-2277. i know the oem pumps can support appx 210 whp. go ahead and use the 255 since you've got it, get the aem regulator. it will fix all your problems.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TECH43 RACING INC. &raquo;</TD></TR><TR><TD CLASS="quote">

not sure on flow rates, call john @ rc, he'll know. 310-320-2277. i know the oem pumps can support appx 210 whp. go ahead and use the 255 since you've got it, get the aem regulator. it will fix all your problems.</TD></TR></TABLE>

Thanx! Im using the stock pump again until I get an AEM FPR!

I wonder if an OEM pump will support H22 injectors

 

those injectors wont work well without a hondata.
try stock injectors, should be fine.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TECH43 RACING INC. &raquo;</TD></TR><TR><TD CLASS="quote">those injectors wont work well without a hondata.
try stock injectors, should be fine.</TD></TR></TABLE>

What about an SAFC2!

 

not enough adjustablilty, trust me, put in the 240's, they are MORE than sufficient for your setup. they can support 210+ whp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TECH43 RACING INC. &raquo;</TD></TR><TR><TD CLASS="quote">not enough adjustablilty, trust me, put in the 240's, they are MORE than sufficient for your setup. they can support 210+ whp.</TD></TR></TABLE>

Thanx for the info!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TECH43 RACING INC. &raquo;</TD></TR><TR><TD CLASS="quote">go ahead and use the 255 since you've got it, get the aem regulator. it will fix all your problems.</TD></TR></TABLE>

this is correct, this is what i have-

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TECH43 RACING INC. &raquo;</TD></TR><TR><TD CLASS="quote">not enough adjustablilty, trust me, put in the 240's, they are MORE than sufficient for your setup. they can support 210+ whp.</TD></TR></TABLE>

also correct; keep in mind that JUN only offers an injector upgrade for their stage 4 engine packages to approx. a 270cc injector...this is approx. a 200 wheel hp setup.