Stock Fuel Pump Under Review

[WhitePrincess]

Hi gents,

I'm in need of assistance

having a little problem with fuel pump atm (so I've been told), need answers to the following questions:

- does it die gradually? or just dies and no fuel delivered to the engine?

- what are the symptoms of a faulty fuel pump?

- what's the capacity of the stock fuel pump (ie. liters/hour)

- thinking of replacing with a Walbro GSS342 - 165lt/h ~ 475hp - good choice?

(intentions for the car - no more than 14psi boost - R33 S2)

Thanks in advance.

Edited February 6, 2007 by WhitePrincess

[Rancher]

Ive gone through search a few times (looking at other things) and seen this subject a million times.

1. I can be both. Slowly it can lean out your engine. Or you could be reving out 8,000RPM and it will die, leaning out your engine badly.

2. Some have said that it gets really loud. Others have said fuel pressure drops. Personaly when mine did it. I was running leaner then a Anorexic chick at christmas dinner.

3. I dont know that. Look around on the internet. Its there.

4. That migh almost be too big. Get a Bosch 044 pump or similer. Should be fine for your application.

[WhitePrincess]

haha

Personaly when mine did it. I was running leaner then a Anorexic chick at christmas dinner.

What are the ways to see how lean I'm running it?

[siddr20]

Well i aint no expert, but if your car is running lean then you will be seeing white smoke out the back.

Its the opp to running rich..

[RB30-POWER]

typically once the brushes wear out, the pump will just stop, but if you hit the tank you can get the brush holder to make contact and get the car running again for a little while.

if it was dropping flow, you would check the power supply to the pump for voltage drop and also check the filter/strainer for blockages.

[Rancher]

When I knew it was running rich it was running amazing for the first 5min. Like flying. After that the under bonet temp jumped up to about 80* on the highway... Missing. Exhaust temp light came on. knocking. and then it died.

I also blew out my nice new (like 40,000KM) Hi-Flow cat. Now that its running all good, the honey comb stuff is ratteling around in my exhaust...

Well i aint no expert, but if your car is running lean then you will be seeing white smoke out the back.

White smoke is water, ie; Blown head gasket and its pumping coolant into one of the cylinders. OR, condensation in the exhaust after a cold night.

Black is fuel

Blue is oil.

When it runs lean (like dying fuel pump lean) no smoke is being blown out. And it usually gets very hot, VERY fast.

Edited February 6, 2007 by Rancher

[MANWHORE]

use a wide band lambda sensor. And road test it.

The walbro is probably ALRIGHT, but not the best. I'll pm you my reason why and my suggestion