walbro fuel pumps and fprs

[20DET]

i wana start this up because im seeing everyone on here saying that if u have a walbro fuel pump and a stock fpr it will run rich...

now ive been a mechanic for years and have never heard of someone saying that a big fuel pump with a stock regulator will make it run rich...

in case u all dont know what a fuel pressure REGULATOR does it REGULATES (hence the name) the fuel pressure to around 43.5 psi...now the fuel pump part.a rb25det fuel pump has a rating of around 130lph at a constant 12v...and a walbro has a rating of 255lph..now thats nearly double right???so the fuel pump is feeding ur fuel rail with twice as much fuel right...so that means more pressure is going to ur rail right???

so...theres more pressure going into the rail BUT the regulator is still set to bleed out fuel at 43.5 psi fuel pressure...so in fact the car would not run richer but it would run exactly the same but with a more stable more reliable feed of fuel...

the regulator will still regulate the fuel pressure in the rail to 43.5 wich is what it was before???

im sure someone here will tell me im wrong lol

[jdmser]

The factory fpr can't bleed off the pressure fast enough.

[bmart]

s***, you're the smartest mechanic in the world!

[20DET]

ok then smart arse...mine runs a walbro pump and standard ecu and reg and it puls perfect a/rs...explanation please cos my explanation covers it quite well

[Cjmartz2k]

Whether or not the factory FPR can bypass enough fuel from a single walbro is a matter of debate. Many guys over on SAU have no problems with the factory FPR on a larger pump like a Bosch 044. Some people do have problems though, and I have seen it myself on 2 different occasions. I think it's a mixed bag, but jdmser's explination of why they don't work in some situations is perfectly sound. No need to get an attitude.

[Joe]

i wana start this up because im seeing everyone on here saying that if u have a walbro fuel pump and a stock fpr it will run rich...

now ive been a mechanic for years and have never heard of someone saying that a big fuel pump with a stock regulator will make it run rich...

in case u all dont know what a fuel pressure REGULATOR does it REGULATES (hence the name) the fuel pressure to around 43.5 psi...now the fuel pump part.a rb25det fuel pump has a rating of around 130lph at a constant 12v...and a walbro has a rating of 255lph..now thats nearly double right???so the fuel pump is feeding ur fuel rail with twice as much fuel right...so that means more pressure is going to ur rail right???

so...theres more pressure going into the rail BUT the regulator is still set to bleed out fuel at 43.5 psi fuel pressure...so in fact the car would not run richer but it would run exactly the same but with a more stable more reliable feed of fuel...

the regulator will still regulate the fuel pressure in the rail to 43.5 wich is what it was before???

im sure someone here will tell me im wrong lol

....you probably shouldnt be a mechanic..

[20DET]

yea i know...im getting a attitude cos these boys are getting a attitude...

here we go

how about this

your fuel pressure reg must be stuffed if it cant bypass enough fuel with a walbro cos mine works perfectly with a walbro pump in it...it could be something to do with the vacuum side maybe??? ,mine is pluged into where the bov is normally pluged upto

[20DET]

i shouldnt be a mechanic??? your a up ur self a** hole mate...u shouldnt be a moderator all u ever do is diss...im trying to make a thread here with actual facts and try to make people understand the situation with fuel pumps

[20DET]

also my other car...a 1.3 toyota starlet gt running a 4efte with walbro fuel pump and standard fpr runs perfect a/rz too...so like i said...bets are that if ur car runs rich with a big pump is that ur fpr is stuffed

[placham]

ok then smart arse...mine runs a walbro pump and standard ecu and reg and it puls perfect a/rs...explanation please cos my explanation covers it quite well

Then why would you even worry about it or start a thread?

Simply you replace the pump and FPR is stock, its set-up (engineered) for the pump that comes on the car for that motor.

Try putting a smaller flow rate pump than stock and see if I will cause any issues with your engine. Same thing happens when you put a bigger flow rate pump.

That's why some people use Apexi SAFC controller to fine tune, so they reach stoich A/F rate.

Basically your pump feeds fuel rail, once you increase fuel flow or fuel pressure through fuel pump. Your injecting(forcing) more fuel every time your injector is open.

Some people use that to their advantage, when you dont want to change(upgrade) injectors, you increase fuel flow rate or fuel pressure via pump or FPR. If you had a adjustable FPR and stock oem pump you can increase fuel delivery into cylinder by turning up the pressure in the fuel rail beacuse you'll force more fuel through injectors every time they open.

[placham]

also my other car...a 1.3 toyota starlet gt running a 4efte with walbro fuel pump and standard fpr runs perfect a/rz too...so like i said...bets are that if ur car runs rich with a big pump is that ur fpr is stuffed

And what the fudge is A/Rz or A/Rs are you talking about turbo housings or A/FR (air fuel ratio).

[20DET]

air fuel ratios durr..and no u wouldnt up the pressure to make more fuel go in cos then the fuel wouldnt atomise...youd have straight black smoke coming out ur exhaust...not to mention some washed bores...not good brainbox....and the reason i started it is (if you could read) that cos everyone on here says a walbro pump and standard reg overfuels...but it does not

[Joe]

i shouldnt be a mechanic??? your a up ur self a** hole mate...u shouldnt be a moderator all u ever do is diss...im trying to make a thread here with actual facts and try to make people understand the situation with fuel pumps

*sigh*

whatever you say sport. apparently in your 19 years on this earth youve been working on RB's for most of them and know more than the collective intelligence of this board.

and yes, all i do is make fun of people because someone needs to keep egotistical people who think they know everything in check.

you say youre trying to make a thread with facts but your posts are on the intelligence level of a pissed off teenager. ive personally seen a big pump + stock FPR cause overfueling issues on a RB but apparently im wrong, according to you

[20DET]

ok...so urv seen a big pump and standard reg go bad....but ive seen a big pump and standard reg go good.many a times.....

and did i say i know everything??? no i did not

[silviasgp06]

lots of drama in the RB section lately...

in summary so this can be officially locked,

A stock FPR might work for someone if it is in working condition,

but!

A new aftermarket FPR is good because a user can eliminate the stock FPR as a source of potential rich-ness (either now or later). __

Some stock FPRs are more than 15years old, its best just to replace it, but not essential.

[240daveTX]

lots of drama in the RB section lately...

in summary so this can be officially locked,

A stock FPR might work for someone if it is in working condition,

but!

A new aftermarket FPR is good because a user can eliminate the stock FPR as a source of potential rich-ness (either now or later). __

Some stock FPRs are more than 15years old, its best just to replace it, but not essential.

nice cliff notes D.

[20DET]

yay someone with knowledge actually knows that it can work and not overfuel like a ho bag

[Sil240]

I have a 20 and a Wabro and my car is rich at idle.I have a AFPR thats going on soon.

A FPR doesn't cost THAT much $$.Y bother keeping the stock one, thats 18 years old.

[20DET]

how much are those nismo ones?

[Cjmartz2k]

yay someone with knowledge actually knows that it can work and not overfuel like a ho bag

WTF are you talking about?? I said the same damn thing as Silvia's in the first post I made. Don't get all excited just because somebody might possibly be taking your side in an argument, even though I kinda already did.

We all understand your factory FPR works fine with your Walbro. I believe it, and I believe a factory one would work on a lot of cars. The problem is not everybody has had the same experience be it from just overpowering the factory FPR, it being old and worn out/not working correctly, or whatever, and a cheap $120 aftermarket FPR fixed the problem.

You're starting to piss me off with the attitude and I was trying to back you up. Good job internet warrior.

[IMG][/IMG]

[20DET]

yea i know u said the exact same thing...i never said u were wrong...ur the internet warrior

[Cjmartz2k]

ur the internet warrior

I know you are but what am I???

IBTL

[Joe]

yay someone with knowledge actually knows that it can work and not overfuel like a ho bag

hold on

because someone agrees with you they have actual knowledge?

[bmart]

hold on

because someone agrees with you they have actual knowledge?

Didn't you hear? He's the all knowing mechanic. He can even explain what a regulator does.