Will this cause me to run rich or will it be ok as long as i keep my fp at stock level ? The fuel system is stock...what other upgrades would i want to do to get the most out of the fuel system, i am staying NA. I am getting a rebuild and doing head work before i do this with fuel system.

 

the pump doesnt determine fuel pressure the fuel pressue regulator does. the walbro pump wont make a difference about runing rich or lean.

 

The fuel pressure can never be stock.

If you look in the helms manual - the fuel pressure is a range - its not a certain number(43psi)......if you want to lean it out - get an adjustable fuel pressure regulator and dial it down a bit. What kind of air/fuel gauge do you own?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s &raquo;</TD></TR><TR><TD CLASS="quote">the pump doesnt determine fuel pressure the fuel pressue regulator does. the walbro pump wont make a difference about runing rich or lean.</TD></TR></TABLE>

that's what i thought too. I had a walbro 255 in my car, at 45 psi wot, and I was running very rich. I swapped out for a stock fuel pump, adjusted my fpr to be at 45 psi wot again, and the car runs 10x better.

OP, don't put the fuel pump in until you need the extra volume.

 

The high volume fuel pump can be installed and will run just like your stock fuel pump, it will not make your car run rich. That's what a fuel pressure regulator is for.

 

i run a 255 lph in my h22 accord and a 255 lph hp in my h22 civic, neither car has had any fuel pressure issues related to the fuel pumps. the fuel pressure regulator if working will maintain pressure.

 

Generally speaking, is there a rule of thumb at which point one needs to add a hi-flo fuel pump?

 

^ anybody know?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hu &raquo;</TD></TR><TR><TD CLASS="quote">Generally speaking, is there a rule of thumb at which point one needs to add a hi-flo fuel pump? </TD></TR></TABLE>

I would assume whenever your 345cc injectors are at 90% duty cycle.
To find that out - you can get a hondata - or get an oscilloscope.....hook the ground and signal wire up - and read the graph.

 

nah at 90% duty cycle you incrase pressure or go with larger injectors.
i know at stock pressure levels an accord fuel pump can suport 250 whp.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s &raquo;</TD></TR><TR><TD CLASS="quote">nah at 90% duty cycle you incrase pressure or go with larger injectors.
i know at stock pressure levels an accord fuel pump can suport 250 whp.</TD></TR></TABLE>

So, I'm assuming you're saying - get an adjustable fuel pressure regulator and high volume fuel rail before you get a high pressure pump.

 

depends ont eh age of the pump. i woudlnt waste the money on a rail either unless you are aioming for bling factor or 400 hp or more.
i persoanlly would get higher flow injectors to start with and a fuel pressure gauge. then add the adjsutable fpr, and then add the fule pump.
i replced pumps in my cars when they were 10 years old and 7 years old, and moth making 75-150 horsepower more than stock, but i suspect i didnt even have to do it then.

 

I have a 92 Lude now and I am getting ready to swap my H23 (old but good when she lasted) for a newly re-built H22A4 block. I already have VTEC injectors, OEM fuel rail as well. however I did invest in an adjustable fpr with gauge (oil filled).

Not to jack your thread, but is a new fuel pump feasible here. Have no idea what kind of shape the pump is in now, other than it is over 12 years old...

 

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

Not to jack your thread, but is a new fuel pump feasible here. Have no idea what kind of shape the pump is in now, other than it is over 12 years old...
</TD></TR></TABLE>

I would do it just as a safety measure if I were you... $80 or whatever is worth it to not have to worry about fuel supply.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Hawkze_2.3 &raquo;</TD></TR><TR><TD CLASS="quote">I would do it just as a safety measure if I were you... $80 or whatever is worth it to not have to worry about fuel supply. </TD></TR></TABLE>

I agree with that 100%
why worry about it?

 

yeah I mean I figured I was going to replace it anyway, but since a stock fuel pump is over $350 new, figured walbro was better overall (price and performance).

 

from my understanding, the first step in ur fuel system should be a fpr to regulate pressure, a bigger fuel pump is only necessary when u are making more power and will need more fuel, same wiht the injectors. a fuel rail isnt really necessary and wont give u much of a gain. u also def want to invest in an air/fuel ratio gauge, because all these upgrades are pointless if u dont have ur air/fuel dialed in.

 

use a good FPR, i have a b&m style with the 255walbro and its kinda janky. Works but i recromend a good FPR..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by v4lu3s &raquo;</TD></TR><TR><TD CLASS="quote">the pump doesnt determine fuel pressure the fuel pressue regulator does. the walbro pump wont make a difference about runing rich or lean.</TD></TR></TABLE>

This is incorrect. A fuel pressure regulator can only raise fuel pressure, not lower it. Just like a boost controller. A higher flowing fuel pump WILL increase fuel pressure.

-Neil

 

yea, i was lookin to just get one off ebay for like 40 bucks, altough i dont want to do anything cheaply with my car, arospeed makes one and the other is like jdm fuel pressure w/gauge, i guess most of them will fit on an h22a?? i was just ganna get a jdm one that has a guage on it, anyone think this isnt a good idea??

 

whats a jdm fpr? like, what makes it "JDM"?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onefastrx7turbo &raquo;</TD></TR><TR><TD CLASS="quote">This is incorrect. A fuel pressure regulator can only raise fuel pressure, not lower it. Just like a boost controller. A higher flowing fuel pump WILL increase fuel pressure.

-Neil</TD></TR></TABLE>

Well somehow that doesn't seem to happen on cars that I have put them in. With a stock fpr and b&m fuel pressure gauge i saw the exact same pressure before and after the Walbro 255 fuel pump was put into my daily driver.
On 2 recent civics that I installed fuel pumps on I did not see a change in the fuel pressure before and after the pump install, and one of those pumps was a 255 HP.

 

Well, I had a GTR fuel pump on my RX7 in Japan and that was the main reason I wasn't leaning out. If you have a stock pump running at 12V, putting out say 40PSI at 150LPH. then you had a high flow fuel pump running at 12V, 60PSI at 255LPH. It's physically impossible to have the exact same rail pressure since the FPR can't lower pressure; only raise it. How much do these stock pumps flow?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by onefastrx7turbo &raquo;</TD></TR><TR><TD CLASS="quote">

This is incorrect. A fuel pressure regulator can only raise fuel pressure, not lower it. Just like a boost controller. A higher flowing fuel pump WILL increase fuel pressure.

-Neil</TD></TR></TABLE>

what do you mean by that? it only raise it from the state when it doesnt have a fpr? because from what i know, you can raise it and lower it..

 

it actually says like jdm fuel pressure regulator haha i guess its just like a basic universal fuel pressure regulator, ill prob get an arospeed or b/m but then i got to get a guage for another 40 bucks