fuel pump went out...just wondering.

 

A 255 on a stock motor is pointless, You'll run to damn rich.

A 255lph fuel pump would most likely best be used on a F/I motor, Not stock, Not even with a few bolt on mods.

 

grab their 190 FP, i know a dude using a 190 walbro with a FI set up. no need for a 255 or anything that big.

 

w/ the 190 it'll still run rich, i've dropped 4mpg since putting it in my civic. since my previous plans are out the window, i'm putting the stock one back in.

my suggestion is to get a stock one.

 

i say that you go with the 255 fuel pump. just get a FPR and down tune the fuel. its something less to buy when you decide to do more things to your car. buts thats my opinion. BTW im running a 255 fuel pump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDM_COUPE &raquo;</TD></TR><TR><TD CLASS="quote">i say that you go with the 255 fuel pump. just get a FPR and down tune the fuel. its something less to buy when you decide to do more things to your car. buts thats my opinion. BTW im running a 255 fuel pump</TD></TR></TABLE>

wouldnt the excess pressure be released back to the tank via the return line

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mr. teal Type R &raquo;</TD></TR><TR><TD CLASS="quote">wouldnt the excess pressure be released back to the tank via the return line</TD></TR></TABLE>

i have a 255lph with stock fpr, and my fuel pressure is @ 50psi (idle), which is waaaay to high for my b18b. for some reason when i had my b16 in there, with the same stock fpr and injectors, it was at 42 psi.

so yea, don't go for the 255, its really overkill and you'll need an adjustable fpr and gauge for sure

 

hmm, I've been wondering about this too.

so to clarify,
if you have everything else stock(injectors, FPR, fuel/timing maps) and a 255lph intank pump..

your injectors will actually pump out more fuel?

I guess I always though the higher # pump is more of a "capacity" so that if you're running your injectors at a higher duty cycle, or pumping more fuel using an FMU or something, the stock pump would get maxed out, so you'd need the upgraded pump...

but if the injectors werent asking more of that upgraded pump it'd still just pump out the same.

guess I was wrong though.

 

good question. to add on to the question, if i had free access to uberdata wideband street tune, can i get a 255 fuel pump and tune it right?

Why would i want that? just getting mods and installing one at a time.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tad &raquo;</TD></TR><TR><TD CLASS="quote">hmm, I've been wondering about this too.

so to clarify,
if you have everything else stock(injectors, FPR, fuel/timing maps) and a 255lph intank pump..

your injectors will actually pump out more fuel?

I guess I always though the higher # pump is more of a "capacity" so that if you're running your injectors at a higher duty cycle, or pumping more fuel using an FMU or something, the stock pump would get maxed out, so you'd need the upgraded pump...

but if the injectors werent asking more of that upgraded pump it'd still just pump out the same.

guess I was wrong though.</TD></TR></TABLE>

i always thought that too, if you have stock everything i figured your computer would only send more fuel if it is needed, ie higher rpms and such. I always thought that if you were running a high flow fuel pump that it wouldn't run unless needed, someone please clarrify?

 

yes please clarify because i always thought the ecu could only allow so much fuel to go into the motor instead of the high pressure fuel pump managing to pump out more than enough fuel that is needed.

 

bump it up i want to know too

 

fqw3few

 

i got a 255 fuel pump in my b18c/EH3 Si..
i also have a B&M FPR wit da gauge set at 35 psi and it's running fine!!
if u are plannin turbo then, get 255 with gauge and FPR..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92eh3si &raquo;</TD></TR><TR><TD CLASS="quote">i got a 255 fuel pump in my b18c/EH3 Si..
i also have a B&M FPR wit da gauge set at 35 psi and it's running fine!!
if u are plannin turbo then, get 255 with gauge and FPR.. </TD></TR></TABLE>
fpr = $$$

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by trooper0641 &raquo;</TD></TR><TR><TD CLASS="quote">yes please clarify because i always thought the ecu could only allow so much fuel to go into the motor instead of the high pressure fuel pump managing to pump out more than enough fuel that is needed.</TD></TR></TABLE>

What happens in a fuel system is that a pump will pump what it's rated at. So a 255Lph pump will flow 255 liters per hour at idle all the way up to WOT, your engine will only use the required amount of fuel and send the rest of the fuel back to the tank through the return line. Because a 255 lph pump will flow SIGNIFICANTLY more fuel than the stock pump does, it tends to overwhelm the stock fuel pressure regulator/return line and therefore the fuel pressure increases because it can't bleed off the excess fuel fast enough. An aftermarket adjustable FPR will help dial the pressure down to the proper level.

Using a pump capable of flowing this amount of fuel should not be used unless you will be running boost period. A stock B series pump can handle up to 300 hp so unless you plan on going boost for sure...sell that pump and spend your money on something more practical and worthwhile.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tad &raquo;</TD></TR><TR><TD CLASS="quote">hmm, I've been wondering about this too.

so to clarify,
if you have everything else stock(injectors, FPR, fuel/timing maps) and a 255lph intank pump..

your injectors will actually pump out more fuel?
</TD></TR></TABLE>

Yes your injectors will pump out more fuel because of higher fuel pressure...that's how adjustable FPR's work at tuning your fuel curve....when you reduce the pressure you lean out the fuel curve and when you increase the pressure you'll ritchen up the fuel curve. Dry nitrous kits also use this method to supply enough fuel through the stock fuel injectors by jacking the stock fuel pressure way up causing the fuel injectors to flow a lot more fuel when they open. It's a crude way of tuning a fuel curve but it works when done properly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 00Red_SiR &raquo;</TD></TR><TR><TD CLASS="quote">
Because a 255 lph pump will flow SIGNIFICANTLY more fuel than the stock pump does, it tends to overwhelm the stock fuel pressure regulator/return line and therefore the fuel pressure increases because it can't bleed off the excess fuel fast enough. </TD></TR></TABLE>

aha!
thats the key right there.

 

you have over 4thousand posts and you're just now learning this?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AzCivic1.6 &raquo;</TD></TR><TR><TD CLASS="quote">you have over 4thousand posts and you're just now learning this?</TD></TR></TABLE>

Don't bark up that tree, boy.

 

wtf?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Had one laying around from my RX7 and it fit like a charm.
The pump sock of the stock EG fit in perfect to the RX7's butt.
The only modifying I had to do was cut the bottom of the pump
support (holds the pump in place), and use a stainless hose
clamp to hold the pump. Oh, and had to cut two slits in the
tank baffle and bend it to add room for the much bigger pump.
Took me about 20min to do the whole thing, cost me nothing,
and will support up to 350whp.

I know you can get other pumps but these are stock off of RX7's
and these guys are dying to get rid of them.. Probably get them
for $20 since they're basically trash to them. </TD></TR></TABLE>

I found this a while back and saved it maybe you can try this

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AzCivic1.6 &raquo;</TD></TR><TR><TD CLASS="quote">you have over 4thousand posts and you're just now learning this?</TD></TR></TABLE>

yeah I have 4thousand posts, and I know plenty of stuff,

but OBVIOUSLY I HAVE NEVER HAD THE NEED TO INSTALL AN AFTERMARKET
FUEL PUMP THUS I DONT HAVE COMPLETE KNOWLEDGE ABOUT THEM

duh,
Also after 4k posts, I learned not to make comments like the one you just did

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 00Red_SiR &raquo;</TD></TR><TR><TD CLASS="quote">

What happens in a fuel system is that a pump will pump what it's rated at. So a 255Lph pump will flow 255 liters per hour at idle all the way up to WOT, your engine will only use the required amount of fuel and send the rest of the fuel back to the tank through the return line. Because a 255 lph pump will flow SIGNIFICANTLY more fuel than the stock pump does, it tends to overwhelm the stock fuel pressure regulator/return line and therefore the fuel pressure increases because it can't bleed off the excess fuel fast enough. An aftermarket adjustable FPR will help dial the pressure down to the proper level.

Using a pump capable of flowing this amount of fuel should not be used unless you will be running boost period. A stock B series pump can handle up to 300 hp so unless you plan on going boost for sure...sell that pump and spend your money on something more practical and worthwhile.</TD></TR></TABLE>

will a vortech fmu help with that too? i am gonna run the vortech 12:1 fmu with the walbro 255 high pressure pump. when im not in boost...will it be dumping in too much gas or will the fmu keep it down?