255lph (low pressure) walbro fuel pump?

[JoL]

Hey I have a question regarding the 255lph (low pressure) walbro fuel pump, will out be to much for my stock fuel pressure regulator. My OEM fuel pump died and i need a replacement and would like to get one of these. I heard the high pressure 255 pump is to much for the stock fuel system without an aftermarket fpr. Will the 255 low pressure walbro fuel pump be to much for my close to stock talon? I would like to stay close to stock and not get an aftermarket fuel pressure regulator and i would not like to run rich.
thanks
~Joel

 

[mitdrx]

it's true it will overrun your system. If you really need a 250 then buy the fpr. But you can run a 190 of your stock regulator. The choice is yours. Choose wisely.

 

[DSMTalonAWD51]

a fuel pump can be bought new for $90 and i've seen walbro 190s support a 16g turbo at 22psi all the time. If you need more power than that get the 255 and the fpr, but it not its probably overkill and you can always upgrade later.

 

[1993eclipseGS]

Every car is different, I've had a walbro 255 in my previous car, And this one... No problems, No afpr. My friend has one in his boosted 3rd gen, No afpr, No problems.

 

[Slippi84]

If you go with a 255 you should def go with a AFPR. People will tell you that you don't need to but once you start going I don't need this or that you start cutting corners and have a car that is barely getting by. Atleast get an ebay AFPR which will cost you 60 dollars shipped as a minimum so that way there is no chance of overunning it. You will thank yourself when you go to tune and your base fuel curve in linear and you can actually tune properly.

 

[JoL]

so the 190lph would be fine for the stock fuel system. and some DSMers say the 255lph (low pressure right?) wouldn't harm the stock fpr... Im assuming your talking about the low pressure 255 vs. the high pressure 255. What are the differences between the low pressure and high pressure 255?? on extreme psi they are all on sale for 95 and i figure why not get better than the 190...so yeah. i would prefer not to get a fpr but we'll see. I just need to know asap so i can get back on the road. thanks for all the info guys!

 

[beat90tsi]

FPR overrun is a problem at idle and low load/rpm. The high and low pressure 255s perform the same at low pressures. The "high pressure" pump is able to move a higher volume at higher pressures (when you are running higher boost). From a performance standpoint, there is no reason to buy the "low pressure" unit. In fact, I can't think of any reason to buy it.

Get a 190, or get a 255 and the AFPR.

 

[steve]

I've had a walbro 255 in my previous car, And this one... No problems, No afpr. My friend has one in his boosted 3rd gen, No afpr, No problems.

I didn't notice a fuel pressure guage in your mod list, do you have one?

Steve

 

[Slippi84]

Steve that's because any reputable AFPR has a built in one. Matter of fact even a cheap ebay AFPR has a gauge on it. But your right of course you need to know your fuel pressure when messing with fuel uprgardes to make sure you stay within specs of the stock setting to make accurate tuning possible of course unless you want to use the fuel pressure as a band daid for the lack of flow via to small a fuel pump or to small injectors but either way just rasing fuel pressure is not the right way to do it.

 

[i1nk83]

actually i rarely see afpr w/ a guege "built" in all o9f them have the outlets for a guage but very rarely is the guage included unless you get it as a kit. and i have a 255hp in my car and the fpr is overrun like a sumbitch. makes for horrible gas milage and a nasty topend.if you get the 255 get a afpr as well it will be well worth it when you go to have it tuned

 

[Jason84]

i think everybody should get an AFPR no matter what... atleast change out the fuel lines or something... i couldnt belive it the first time it ook off the stock fuel line how tiny that was going into the fuel rail !!!

 

[steve]

Steve that's because any reputable AFPR has a built in one.

You'll note 1993eclipseGS says he doesn't have an AFPR. So my question about having a fuel pressure guage.

Even though every car is different I've yet to hear of any stock DSM FPR that doesn't overrun with a 255 l/h pump. I see a small difference in base pressure with a stock FPR with my 3KVR4 pump over the original pump. That may be due to overrun or some issue with the stock pump. Mitsubishi included a multiple voltage circuit on the 3kVR4 to drive the pump because of issues with the pump and the FPR used on the 6G72.

The only way you'll know for sure that your regulator isn't overrunning is to measure your fuel pressure and make sure it's tracking manifold pressure.

There is no question that a car will run with a FPR that isn't tracking manifold pressure, just like it will run with a poor tune but the purpose of a FPR on our cars is to maintain a constant pressure difference across the injectors so that the injector always delivers the same amount of fuel/mS regardless of RPM, manifold pressure, accelerating, decelerating, phase of the moon, etc.

A fuel system that can't do this is a problem in my book.

When someone says something works without any problems I want to know how they tested to decide if the facts support their conclusions.

Steve

 

[Slippi84]

Steve you are indeed a wise man . Yeah i thought you were talkin to the original poster about needing a fuel pressure gauge even though i tol him def get a AFPR. I def think your right those are the same type of guys that vent w/o MAF/Tranlator and be like i'm not having any problems with my setup. No you are they just aren't big enough to stop your car from running right YET!

 

[oldman]

When someone says something works without any problems I want to know how they tested to decide if the facts support their conclusions.

Those people are the reason why this same old question is being asked 3 times a day.

 

[Jason84]

yeah... ive never seen an afpr with a "built in gauge" ive seen them pretapped for a gauge to screw in... but thats about it...

where did you find the cheap ebay one with it built in ???

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ive got full -6 from the tank... wish i woulda went iwth -8 though because -6 really sucks to work with....

 

[Slippi84]

well my friend i would like to be the first to show you but probably not the last.

http://cgi.ebay.com/ebaymotors/FUEL...990663768QQcategoryZ33553QQrdZ1QQcmdZViewItem

That is the cheapest one on ebay and as you can see has the gauge right on it.


Yes it does crew in but it comes with the AFPR that is what i meant by built in. Lets not play symantics.

 

[beat90tsi]

Sweet, a JDM tite FPR yo.


# JDM Adjustable Fuel Pressure Regulator.
# Light Weight Designed, make of CNC Billet Aluminum.
# It can provide precise consistent boost as mush as Twice of the factory Fuel Flow.
# Fuel pressure regulator can delivering preformance, long-life, and reliable operation.
# Increase fuel delivery by raising pressure around 5~10 horses power.