Fuel pump swap

[kahlilj]

i have NT 90 eclipse 2.0L. my fuel pump needs to be replaced. do you know if there will be any problem (or if there is an advantage) in going with a 190lph fuel pump (walbros.) instead of replacing with stock unit (100lph?)

will i need to change the fuel press reg too if i get this pump?

i have searched the forum for this topic because it seems this probably has been discussed before but i could not find my concern directly addressed at all.

thanks,
kahlil

 

[TUI2I30]

If you don't plan to tune your car to perform better there is no reason to get an upgraded pump. I have a 255lph pump and I definitely need an AFPR. I've heard it said that the 190lph will not over run the stock FPR but I don't know since I've only ever run stock, rewired stock, and 255. Good Luck!

 

[98RedGs]

Also here's a vfaq on how to do a fwd which is about the same as the one your driving right now, given this one linked is a turbo model but the same rules normally apply.


http://www.vfaq.com/mods/wayback/1GFWD-pump.htm

 

[kahlilj]

If you don't plan to tune your car to perform better there is no reason to get an upgraded pump. I have a 255lph pump and I definitely need an AFPR. I've heard it said that the 190lph will not over run the stock FPR but I don't know since I've only ever run stock, rewired stock, and 255. Good Luck!

TUI2I30, i plan on doing a few more mods. i already have k&n air filter & accel 8mm plugwires on. eventually, i'd like to replace the exhaust header as well, but have not found anything decent for the money. (do not like the look nor the "build-quality stories" i've read about the pacesetter).

guess my main concern is: IS THERE ANY HARM in going with a higher flow fuel pump now?

98redgs, thanks for the link. i actually had already visited this site some time back & downloaded/printed that same procedure!

 

[sciroccosven]

You will never need 90lph extra unless you are running a turbo or some sort of forced induction. The pump is just going to work twice as hard and the fuel is just going to come back through your return lines. Keep in mind your almost doubling the amout of fuel you had before and you are only using the stock amount. The only thing I can think of oofhand is that you will propbably go through fuel filters alot faster. Overall I really dont think its a good idea to double the fuel when you can barely use half of whats getting pumped.

 

[kahlilj]

You will never need 90lph extra unless you are running a turbo or some sort of forced induction. The pump is just going to work twice as hard and the fuel is just going to come back through your return lines. Keep in mind your almost doubling the amout of fuel you had before and you are only using the stock amount. The only thing I can think of oofhand is that you will propbably go through fuel filters alot faster. Overall I really dont think its a good idea to double the fuel when you can barely use half of whats getting pumped.

thanks scirocco sven, i understand the concept of what you're saying. that is why i am curious if there is any harm in doing this without being a turbo or heavily modded, but i don't know that i agree with your statements totally. i don't think the flow will be exactly doubled. maybe close, but i'm thinking i will go from a pump rated to flow just over 100lph to maybe 160-170lph. furthermore i thought the fpr would limit the flow so that it does not "overflow", that is, exceed the demand put on it?

maybe i am totally wrong in understanding how the pump & the regulator will work??

 

[JLeach50]

I have a few bolt-on mods on my 96 eclipse (intake, exhaust, ignition: pack, wires, plugs, etc.). I was having rough idle issues, so i got a Walbro 255 and installed it w/out upgrading the FPR. Now the idle is much smoother and i actually found a slight bump in power. i won't try to promise the same for you, but i can't imagine that it would be a bad thing.

 

[TUI2I30]

I have a few bolt-on mods on my 96 eclipse (intake, exhaust, ignition: pack, wires, plugs, etc.). I was having rough idle issues, so i got a Walbro 255 and installed it w/out upgrading the FPR. Now the idle is much smoother and i actually found a slight bump in power. i won't try to promise the same for you, but i can't imagine that it would be a bad thing.

If you are running a 255lph pump on the stock regulator, I promise you that you are overrunning the stock regulator and you're fuel pressure is too high. If you don't have a fuel pressure gauge and AFPR I stongly recommend that you get one. Also, if you are running stock injectors you do NOT need an upgraded fuel pump!

 

[kahlilj]

ok, i have another possible fuel pump. will a turbo fuel pump with 450cc injectors from a 1997 Mitsubishi Eclipse GST fit my car 1G 1990 eclipse 2.0L N/T?

i.e. will it even fit a 1G NT car? will i need to replace the sending unit or FPR too??

thanks,
kahlil

 

[speedy13]

I don't know about the 2g pump assy,but i do know that the stock turbo one is also 100lph,so there's no point on the 2g pump.you can pick up one of these for like 20-30 bucks on ebay,why bother ghetto riggin it?Like someone said,if your planning on staying NA there's no reason for you to need a high flow pump.If your gonna give that baby a bottle or boost then it wouldn't hurt as soon as you get some tunning device to tune with.I wouldn't go 255,it's overkill for half of the turbo guys in here,not to mention NA.I got a stock one in a pretty little box that i will be ebaying next week.peace out.

 

[kahlilj]

I don't know about the 2g pump assy,but i do know that the stock turbo one is also 100lph,so there's no point on the 2g pump.you can pick up one of these for like 20-30 bucks on ebay,why bother ghetto riggin it?Like someone said,if your planning on staying NA there's no reason for you to need a high flow pump.If your gonna give that baby a bottle or boost then it wouldn't hurt as soon as you get some tunning device to tune with.I wouldn't go 255,it's overkill for half of the turbo guys in here,not to mention NA.I got a stock one in a pretty little box that i will be ebaying next week.peace out.

yo speedy, not trying to "ghetto rig" anything dude. i'm simply wanting to give my car any advantage i can with current & anticipated mods without sacrificing anything. i was thinking this fuel pump was not as much of a difference in rated fuel flow vs my stock pump as the walbros 190lph pump was. never said i was trying to go with a 255 pump tho i agree that would be total overkill.

soooo, if i install pump with no injectors then would that work?

 

[kahlilj]

soooo, if i install pump with no injectors then would that work?

does anyone know? or has anyone ever tried this? that is swap NT fuel pump with higher flow pump?

 

[speedy13]

If your talking about your stock injectors then,you'd be fine because the 190 won't overrun your stock fuel pressure regulator.you will not see any performance gains at this time by just installing a higher flowing fuel pump.log your car and see if your even need more fuel.You might even need to lean it out even more.then you can just save your money and buy an safc to tune with and then you'll squeeze a couple of horseys out of your ride.hope this helped.


P.S. By the look of your profile,you'd still need to get a exhaust,maybe a header before you'd even think of need ing more fuel.

 

[kahlilj]

If your talking about your stock injectors then,you'd be fine because the 190 won't overrun your stock fuel pressure regulator....

kool. that's kinda what i was thinking speedy & why i don't see the big deal if i put on the higher flow pump now with the fpr in place. & yes i do plan on more mods , but things have been too hectic in my life the past few years to do much with the car.. now its getting time to continue work on it.


thanks all for your help