2 stock pumps instead of 1 walbro?

[uncle_louie83]

i still havent found out the LPH a stock pump can push. I know the s14 pump pushs more LPH than the s13 pump. WDracing has done 12psi reliably on an oem s14 pump and ive seen other s14 ppl do the same. So im thinking, since i have 2 oem s14 pumps here should i put both of them into the tank? and do a rewire so i have enough current for the pumps instead of just 1 walbro pump. im going to be under 10psi for a long while and figured 2 pumps would be better than 1 since there oem units.

so what do u people think about this?

[uncle_louie83]

dont just sit there and tell me to get a walbro pump...yes i know its a bigger unit but what im doing here is trying to get facts out of what oem parts can do...especially when u combine more than 1

[Import_Ant]

IMHO for a temporary setup, if you're going to stay under 10 psi on a small turbo the S14 unit should be sufficent. I think it would be a waste of resources to wire the second fuel pump in and get it set up. since the S14 pump has been proven beyond what you will be using it for, I think it's a better idea to just use 1 s14 pump and keep an eye on e-bay for a used mkIV turbo Supra fuel pump or R34 fuel pump. They flow more than a walboro 255lph and you can probably pick one up cheaper as well.

just my .02$

yeah it's exactly what you didnt want me to type but I think it'll be a better set up than two stock S14 pumps. Im definitely not trying to discourage you from trying it but there is limited space in the stock furl pump assembly and i dont know how you'll fit both fuel pumps in there.

[Florida240sx]

Another discussion abotu WHY NOT to have two pumps is....If one pump fails your car goes lean instantly and your engine goes boom.Have a nice day.

[Import_Ant]

Another discussion abotu WHY NOT to have two pumps is....If one pump fails your car goes lean instantly and your engine goes boom.Have a nice day.

In an application like this where ONE fuel pump is sufficent, the working pump will still be capable of supplying the neccesary fuel... based off of your argument we are all at risk of engine failure because there is the .0001% of a chance that our fuel pump could fail while the car is under load. I am not denying that introducing an extra fuel pump will increase that probability (however small it is).

the only valid point I can think of that I left out is fuel cycling. if you are running that much more fuel than neccesary the fpr is going to be cycling alot of it back into the tank and it can cause the fuel to be heated due to excessive cycling. It doesnt pose a safety risk just my debate "if one pump is sufficent why add the other?"

[Florida240sx]

Well now talkign abotu jsut the pump failign by introducing another fuel pump if not wired correctly then the risk greatly increases.What kind of volt/amp do you need going to it. Just get the walboro...

[Import_Ant]

he inquired about rewiring to the battery. that would be more than sufficent.

as shown on http://www.ka-t.org

I guess in hindsight my only real argument against it lewis is the fuel cycling. you dont NEED two fuel pumps if you're staying below 10psi on a smaller turbo. when you get to the point that you're going to surpass that it might be an entertaining project to undertake.

honestly, I only have the walboro because it CAME with my kit. if i had to purchase one seperately I'd have gone w/ a Mk IV turbo supra pump or an R34 fuel pump. more flow for less $ (if you can come across one)
Modified by Import_Ant at 2:43 AM 8/3/2005

[nissanfanatic]

Main problem I see with running two pumps:

If one pump fails, the car still runs fine until you make max power. Then you just run lean and end up with a dead engine.

As opposed to running one pump where the car will at least run crappy.

If you didn't at least rewire the pumps, I'd call you a fool.

[uncle_louie83]

i think to start out i will take your advice aaron and use 1 s14 pump...it has low miles on it and its an oem unit...not an autoparts store unit....i just dont trust auto parts store pumps...same like i dont trust auto parts store bearings.....u know the problem i had when i only had 500 miles on the auto store brand...went with nissan oem and 4000 miles later not a problem....

yes i will upgrade to a supra pump or skyline pump or a walbro later on...but for now if the s14 pump will work efficiantly then why not