At What Point Do You Replace/upgrade The Fuel Pump

[TUF250]

Hi folks, I have a fairly mild R33. Mods are limited to a full 3inch catback exhaust, std airbox with custom ram air scoop and BMC filter as well as an R34 intercooler.

I plan to doing the free boost mod in the short term to get 7-8psi the whole time. (maybe 9-10 given my supporting mods?)

Will the std fuel pump flow enough for this setup or will it need to be upgraded? If so what is the reommended part numbers?

My current fuel pump appears in good nick, not noisy, and the car does not appear to be running out of fiel up top, pulls strong and no missing or running issues.

Thanks

Jason

[joeyjoejoejuniorshabadoo]

it will be fine to around 230rwkw from memory.... you could/should replace it if you want piece of mind as fuel is very very important and it will be 15 years old by now

[R31Nismoid]

Replace it regardless if you are going for anything more tha factory power.

Simple as that.

[jjskyline79]

I tend to go by the rule If it works and isn't broke dont fix it i run 300bhp atf on stock and its fine

if it brakes or stops working ill upgrade it

Simple

[TUF250]

thanks for the replies guys. would you stick with a factory replacement one for those mods? or go for the bigger bosch ones? does anyone have part numbers?

[JonnoHR31]

future plans?

[TUF250]

unsure at thsi stage, would like to go a bit harder on it once its not a daily but for the short to mid term it will be staying with the std turbo and supporting mods

cheers

[KiwiRS4T]

If it ain't broke don't fix it doesn't apply to old fuel pumps. If it leans out or fails at high revs bang goes your motor. There is a Walbro with the skyline fitting kit:

http://www.nzperformance.co.nz/store/walbr...mp/prod_80.html

or the Bosch 040 in tank.

[joeyjoejoejuniorshabadoo]

walbro bad

bosch good

[HEKT1K]

I got in my car one day and it wouldn't start. That is when i replaced my fuel pump lol

+1 for "do it for peace of mind".. i bought mine second hand (but new in box) for about $180

[lookingforboost]

i had a strange miss at idle one day so it put a new Walbro fuel pump in and has been great fixed up the miss at idle i was pretty sure it was on its way out

there are a lot of fake walbros though so be careful but for $180 bucks its cheap upgreade knowing your not going to run out of fuel

[jjskyline79]

If it ain't broke don't fix it doesn't apply to old fuel pumps. If it leans out or fails at high revs bang goes your motor. There is a Walbro with the skyline fitting kit:

http://www.nzperformance.co.nz/store/walbr...mp/prod_80.html

or the Bosch 040 in tank.

Had it 4 years like this

Any part on a car can fail at any time be it new or old

Edited June 27, 2010 by jjskyline79

[paulr33]

my stock pump couldnt keep up with 12psi and 190rwkw so we had to upgrade it

i got a GTR R33 one for fair price so that went in

[lachlanw]

get a pressure gauge. when its not keeping the pressure up then you need a new pump

[Mayuri Krab]

I got in my car one day and it wouldn't start. That is when i replaced my fuel pump lol

Same here.

[PM-R33]

The problem with fuel pumps is if they go from working to failure instantly while driving around normally it's usually fine as the car will usually just stall on you or simply won't start as others have said. It's when they slowly begin to fail and it gradually leans out more and more due to a loss in fuel pressure or when you start giving the car a bit of a thrashing, that's when it can take an engine with it.

[paulr33]

PM-R33 is spot on. if it fails this is OK as the engine stalls

its only when you are pushing power out of it, and it cant keep enough

the engine has enough fuel to run, but not enough to be safe, so it leans out

your engine goes bang

we've seen a GTR R34 do this with a pump that couldn't keep up, costly rebuild and dangerous fire

[sneki81]

i have basically the same mods as you and my pump is fine.

even though it is still working ok i am going to change it very soon.

i figure for $150-$180 it is a very cheap assurance.

and going by the recommendation of well known skyline mechanic, the walbro is fine to use.

[Guilt-Toy]

there is one guy in this country who has gone through 4 engines in the last 3 months. he kept rebuilding the engine and was not interested in searching for the reason it is happening.

He is now asking for my help. Pump will be replaced and AFR's will be checked now

[jjskyline79]

So you guys dont keep an eye on your air flow ratios?