bigger fuel pump?

R

Raginstang

New Member

Sep 28, 2003

166

0

0

SANTA CRUZ CA

Feb 3, 2006

#1

• Feb 3, 2006

• #1

I have 24lb injectors and calibrated maf. lots off mods.. Im still using the stock fuel pump. the car smells VERY fat and burns the eyes, I don't have any cats on so im sure some of the smell is due to that. but at what point do I need to upgrade the fuel pump. Im at 38 psi at idle. I do have a adjustable pressure regulator. thanks

 

FastDriver

I was uncomfortably high & wearing a helmet

SN Certified Technician

Sep 5, 2001

6,062

2,667

224

Vass, NC

Feb 3, 2006

#2

• Feb 3, 2006

• #2

Have you dynoed the car on a wide band, bud? Sure, it's possible to run rich at idle, but Dollars to donuts you're running lean at WOT. Hard to believe you still have the stock fuel pump. That combo should be good for 290 or so rwhp, but I doubt you're actually making that with the stock pump. That stock pump is really only good for 300 hp at the crank or so.

It may sound biased because I've got two sale, but it's the truth and I'm sure others will reply the same way I did.

I've got an old walbro 255 and a new GSS340 (also 255, but a high fuel pressure pump). The 340 is new and comes with the fuel pump bracket and everything for 100 bux, and the old one is used, but ran perfect and I only want 50 bux for it.

Chris

 

8

86bluecobra

Advanced Member

Dec 20, 2004

4,265

12

69

B.C. Canada

Feb 4, 2006

#3

• Feb 4, 2006

• #3

would say it is time to upgrade. and go get a tune. it does sound like you are wasting a lot of fuel.

 

R

Raginstang

New Member

Sep 28, 2003

166

0

0

SANTA CRUZ CA

Feb 6, 2006

#4

• Feb 6, 2006

• #4

so, do you guys really think a bigger pump would help anything? power? drivabilaty? etc?

 

M

matm347

Founding Member

Aug 29, 2000

2,056

0

0

Feb 6, 2006

#5

• Feb 6, 2006

• #5

It will only affect WOT, your eyes are burning due to your tune. 38-40 should be your FP with the vacuum pulled.

 

R

Raginstang

New Member

Sep 28, 2003

166

0

0

SANTA CRUZ CA

Feb 7, 2006

#6

• Feb 7, 2006

• #6

thanks for the replys. currently the fuel pressure is at about 40 with the vacuum hooked up. don't remember unhooked, but close to 32. I don't have any wot problems, just curious why it smells so FAT and if a bigger pump was needed, or am i overkill already with my mods?

 

FastDriver

I was uncomfortably high & wearing a helmet

SN Certified Technician

Sep 5, 2001

6,062

2,667

224

Vass, NC

Feb 7, 2006

#7

• Feb 7, 2006

• #7

Are you seriously running the stock 88lph fuel pump?

This just ain't adding up. Put that thing on a wideband and take a look at your a/f curve at WOT.

Chris

 

R

Raginstang

New Member

Sep 28, 2003

166

0

0

SANTA CRUZ CA

Feb 9, 2006

#8

• Feb 9, 2006

• #8

yeah, im still running the stock fuel pump.. I didn't realize that it was soo needed with my fairly mild combo! but I guess I need to upgrade!