do i need a fpr with a upgraded fuel pump?

[sillyme]

i read somewhere that i have to or my car will be running weird. but i was reading import tuner on there project 1992 talon that they just put on a upgraded fuel pump and ran fine. which one is it? i have a 1990 eclipse gsx and basically following what they have done so far then replace the intercooler.

 

[kottyking]

ok so w/ a walbro 255 you need a fpr to get it to run right. W/ a walbro 190 your'e fine with stock fpr. A 190 is just fine. Either way rewire it.

 

[daren_p]

ok so w/ a walbro 255 you need a fpr to get it to run right. W/ a walbro 190 your'e fine with stock fpr. A 190 is just fine. Either way rewire it.

Yes

 

[importboost]

Well see there is a difference of opinions on this question. The way a regulator is designed there is no reason why it wont work with your upgraded fuel pump. The only downfall is that if your diaphragm blows out, you have no control on it anymore. So if you have the money id get the aftermarket so you know it wont go out(well it shouldnt). But if you want to drive it around for a while without one i see no problem.

 

[weith1111]

The way a regulator is designed there is no reason why it wont work with your upgraded fuel pump.

Do you know what you are talking about? With the larger pumps (255), the flow is too much for the regulator to pass back to the tank, so the rail gets way more fuel than intended, thus an overly rich state. This is erratic at times, making tuning a PITA as well.

 

[FORMONTOYA]

The problem is not with the diaphram, it is with the orifice. On the factory FPR the orifice (hole) is to small to pass the added volume of fuel that an upgraded fuel pump delivers. Most people will say you are fine with a 190 pump and that you need one for a 255 rewired or not. However, IMO I would get an AFPR with any upgraded pump (190/255) just to be on the safe side.

As stated the FPR returns excess fuel back to the tank witch the OEM FPR can't handle with an aftermarket pump. It is mainly a problem at idle and low RPMs when the OEM unit can't do its job. But as stated, it is very non linear in the way it reacts. I would rather be as sure as possible that everything was in order, that is the reason I would opt for an AFPR even on a 190 pump upgrade.


Jim


edit: fixed typo

 

[drewvr4]

this is a dumb question to throw in there because i havent really looked at the fuel rail enough on any dsm to know this

but when you do run a afpr can you run it from that to the stock fpr or do you need to do somthing with the rail itself.

i had horrible problems with mine running rich and it seemed like dsm link could never touch it

 

[weith1111]

You replace the stock WITH the adjustable. The stock regulator is the restriction and has to be eliminated.

 

[FORMONTOYA]

this is a dumb question to throw in there because i havent really looked at the fuel rail enough on any dsm to know this

but when you do run a afpr can you run it from that to the stock fpr or do you need to do somthing with the rail itself.

i had horrible problems with mine running rich and it seemed like dsm link could never touch it

No, you totally remove the OEM FPR from the system. Tank--fuel filter--rail--AFPR--tank.


Jim


edit: beaten' again.

Jim

 

[4g63t]

YES ANother big reason is because you want your fuel pressure to rize at a 1:1 ratio under boost. Most CHEEPO AFPR will not do so.`

 

[importboost]

Do you know what you are talking about? With the larger pumps (255), the flow is too much for the regulator to pass back to the tank, so the rail gets way more fuel than intended, thus an overly rich state. This is erratic at times, making tuning a PITA as well.

See that is what I mean bout differences of opinions. You dont like mine and you assume im wrong. The question is do you know what you are talkin bout? I'm not hatin im just sayin. Unless you have first hand experience with them more than just on your own dsm then I'd say you don't. Don't just assume people are idiots. I know first hand the stock regulator can support a larger flowing pump just fine with proper tuning.

 

[jongreene]

what is your definition of "proper tuning"....i have a 255 and am in dyer need of an AFPR....although it only affects my car negitively after it has been running a while

 

[steve]

I know first hand the stock regulator can support a larger flowing pump just fine with proper tuning.

Many of us actually have measured the fuel pressure before and after the pump swap. With enough data you can make some reasonable conclusions about the behaviour of the stock FPR when used with aftermarket fuel pumps.

If you would like to share your data rather than your opinion, I'd love to hear it.

Steve

 

[importboost]

A long time tuner i know has never ever ran an aftermarket fuel pressure regulator. He owns a 10 second gsx and has ran it for a long time. I personally dont have a regulator also, and so far I havent ran into any problems.

 

[drewvr4]

ok how can we have such a difference of opinion on this issue. it doesnt make sence that some people have no problems then other peoples cars can bearly function without one on it.

now i know for sure when i start my car up in the morning it takes a long time, smells alot like fuel even though we have done adjustments to DSMLink to turn it down, my conclusion is too much fuel in the rail...now that i know i need one my problem is which one would be best

ive looked around and seen any from $50 for a B&M to $200 for an Aeromotive, what do people recommend or are running currently with success?

 

[andymoraitis]

From a tuning standpoint, an AFPR on a 255 is a requirement. The issue you'll deal with is an excess of volume. At best, the motor will simply run rich and at worst, it will potentially wash fuel past the rings and dilute the oil. In addition, when picking an AFPR, stay away from units like the B&M as these are only fuel flow modifiers. Only a true AFPR (Aeromotive, SX) will allow you to turn fuel pressure down as well as up.

90% of the people on this forum could tell me that they run a 255 without any ill effects on the stock FPR and I would challenge them by stating that no matter how many people do something that's wrong, it still doesn't make it right.

Cheers,

Andy

 

[ITSME4G63]

From a tuning standpoint, an AFPR on a 255 is a requirement. The issue you'll deal with is an excess of volume. At best, the motor will simply run rich and at worst, it will potentially wash fuel past the rings and dilute the oil. In addition, when picking an AFPR, stay away from units like the B&M as these are only fuel flow modifiers. Only a true AFPR (Aeromotive, SX) will allow you to turn fuel pressure down as well as up.

90% of the people on this forum could tell me that they run a 255 without any ill effects on the stock FPR and I would challenge them by stating that no matter how many people do something that's wrong, it still doesn't make it right.

Cheers,

Andy

what about a full throttle speed one? Ive been hearing nothing but good things bout those.

 

[drewvr4]

its good to hear some input that finally makes sence

that was my fear when i first started the car, the fuel smelled so strong i was afraid the rings were going to wash...but they didnt.

now that i know an afpr is necessary ill go get one, thanks again

 

[drewvr4]

ive found this with an install kit, seems to be a good price

http://www.fuelinjectorclinic.com/cart/AERO_FPKIT1.htm

 

[andymoraitis]

what about a full throttle speed one? Ive been hearing nothing but good things bout those.

I've been looking at the FTS, but Import Evolution keeps running out of stock on them. The price is great, but they've been tough to get.