Stock S13 fuel pump?

[Edub1]

How much fuel can my stock pump flow? I hate to spend $100 just because people "hear" it's the thing to do. How much HP is my stock one good for?

[sxcoupe]

i dont think hp has anything to do with the pump. the only reson to upgrade to somthing else is if you upgrade injectors and fuel filter or engine swap or somthing along those lines. i could be wrong here but i dont see the point. i dont think you are starving your engine of fuel by haveing a stock fuel pump.

[Nismo_Freak]

Replace the pump or you will get good at pulling engines.

[Nismo_Freak]

i dont think hp has anything to do with the pump. the only reson to upgrade to somthing else is if you upgrade injectors and fuel filter or engine swap or somthing along those lines. i could be wrong here but i dont see the point. i dont think you are starving your engine of fuel by haveing a stock fuel pump.

HP has everything to do with a pump. HP derives a base for the BSFC of the engine which when measured in accordance with fuel pressure gives you the parameters for an upgraded fuel pump.

Personally I think anyone that trusts a fuel pump that is older than some 240 owners to flow twice the fuel it was originally designed for with greater pressure is out of their damn mind. Especially when it costs $100.

[wild_maxx]

[Craving4Boost]

im actually in a delimna about this topic. my brother has a s14 thats in very good condition with around 90k miles and perfect compression. i wanted to install a nitrous wet kit in his s14 but he has a full custom subwoofer box that is mounted (professionaly) into the trunk. (this wasnt his choice...he bought the car like that). now it seems i cant access his fuel pump without tearing open the custom box that is literally connected to his body. is it ok to install a 50 wetkit safley with his stock pump? or will i, in the future, become good at pulling motors? lol

[sxcoupe]

"my bad" then what fuel pump should you replace it with. i had mine changed a while back and i think they used a stock replacement. i didnt have a clue that i should upgrade.

[TheOne]

im actually in a delimna about this topic. my brother has a s14 thats in very good condition with around 90k miles and perfect compression. i wanted to install a nitrous wet kit in his s14 but he has a full custom subwoofer box that is mounted (professionaly) into the trunk. (this wasnt his choice...he bought the car like that). now it seems i cant access his fuel pump without tearing open the custom box that is literally connected to his body. is it ok to install a 50 wetkit safley with his stock pump? or will i, in the future, become good at pulling motors? lol

the stock fuel system should do ok with 50 wet shot, after that it needs a fuel pump upgrade and maybe some, i think a 75 dry shot is the highest on stock safetly.

as for which pump? most people get a 255lhp high pressure walbro pump, can be found from advertisers or ebay for $100 or so.

[Craving4Boost]

just to add...just because ebay says walbro pump for SR...it doesnt matter. SR and KA can use the same fuel pump. or i should say actually...240's use the same fuel pump in general

[sxcoupe]

am i not getting all that i can out of my almost stock ka24de by haveing stock fuel pump. what kind of increase in hp are we talking here, or other performence with upgraded fuel pump.

[Craving4Boost]

upgrading a fuel pump on a NA application will not improve your power. its capable of pushing big power...but you have to earn it. the 255lph should do 500hp(rewired).

[Bosrudorfer]

isnt not even $100, its $89 shipped

[92droptop]

Out of curiosity, why would it be necessary to replace the OEM pump when using a mild setup (T25, SR intercooler, 370cc injectors, etc.) at stock-7psi-boost? The pump is able to handle the needs of the SR, why would it be so different on the KA? Note I am speaking of necessity, not prudence, per se. I know that it would be prudent to change the fuel pump, but necessary for that setup? I just don't see it. The people on that setup are typically the ones who can't afford a whole lot. (I know, gotta pay to play.)

Now, for power goals any higher than the very mild KA-t build just mentioned, I agree that an upgraded pump is absolutely necessary. If you can afford the $1200+ for that setup, then you had freaking better be able to fork over another $90.

Please don't flame me for this post, I may not have many posts here, but I'm no newb to cars or engines (or forums for that matter). Quite to the contrary, I am just finishing my degree in Mechanical Engineering. I am just looking for educated answers. If there is a legitimate reason for the necessity of the Walbro pump at meager power levels, then I will be the first to accept it. Personally, I am building for somewhat higher power levels, so the Walbro was actually my first purchase. Sorry for the length.

[goodstudent]

Hey DropTop,

Was the pump a match for the bracket? How much modification did you have to make to get it to fit? Not the wiring so much as the fit in the rubber bushing and long fuel screen on the OEM pump? By the way, I agree the OEM pump should suffice for mild upgrades as it appears to be substantial and quiet. In my case it is the mileage that is causing me to upgrade the pump prior to the turbo install and I am not interested in tie wrapping or cutting brackets. The alternative is the Tomei unit which comes complete as a drop in replacement but weighs in at $295 with all the hardware. So before I just go that route I wanted to know if the Walbro was a direct replacement type of install...thanks!

[92droptop]

I haven't installed mine yet, but as far as I know, it is essentially a direct replacement. No modification needed.