What should my Fuel Pressure be???

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10-02-2006, 01:09 AM

#11

XSRACINGGT

3rd Gear Member

Join Date: Oct 2005

Location: Hendersonville, NC

Posts: 541

RE: What should my Fuel Pressure be???

mine always went down when I put the vacume line back on. you might have a vac leak. it seems as somethings off if it stays at 39, but, if it runs good, and you don't find a leak in your vac, then i'd say you're 'a ok'

10-02-2006, 01:16 AM

#12

92hatchLX

6th Gear Member

Thread Starter

Join Date: Feb 2005

Location:

Posts: 8,439

RE: What should my Fuel Pressure be???

Nah, it might have something to do with my altitude, my house is at like 5500+ feet, I'm sure that I don't have a vacuum leak, no idle problems, no hanging idle or bouncing idle. I guess that's just how it is, every car is different.

Conclusion:
I won't **** with it.

10-02-2006, 01:21 AM

#13

grabbem88

6th Gear Member

Join Date: Dec 2003

Location: cape giradeau,mo

Posts: 8,872

RE: What should my Fuel Pressure be???

you could do a plug reading test.....i think we've been this route havn't we?

10-02-2006, 01:25 AM

#14

92hatchLX

6th Gear Member

Thread Starter

Join Date: Feb 2005

Location:

Posts: 8,439

RE: What should my Fuel Pressure be???

I could, I might just pull all of my plugs soon just to see what the look like.

10-02-2006, 01:26 AM

#15

grabbem88

6th Gear Member

Join Date: Dec 2003

Location: cape giradeau,mo

Posts: 8,872

RE: What should my Fuel Pressure be???

your conclusion would be my choice also.good call

10-02-2006, 01:27 AM

#16

XSRACINGGT

3rd Gear Member

Join Date: Oct 2005

Location: Hendersonville, NC

Posts: 541

RE: What should my Fuel Pressure be???

yeah, all cars are different. mines a bi%ch to do mods to sometimes. She acts like she doesn't want them or something. always being a pain in the a$$. hehe.

05-15-2007, 05:58 PM

#17

GStam66

4th Gear Member

Join Date: Jun 2006

Location: Commie State

Posts: 1,454

RE: What should my Fuel Pressure be???

Quote:

ORIGINAL: XSRACINGGT

Your fuel pressure should be 39-42 psi with the vacume line OFF, then at idle, when you put the vacume line back on, it should drop to around 35 psi. the injectors are designed to operate at 39-42 psi. if you run it less, you may lean out your car at wot. if you make it more, you might make it run rich, which is beter than running lean, but you still lose power either way. stay around 40 and you'll be good.

I think that may be the prob im having with my 99 gt auto. After lettin the car drive for a bit, if i give it more than 60% throttle, it'll start bucking and jerking at 3500-4500 rpms, and not go any faster. Mechs said it was starving for fuel, and to check the pressure, as well as change the pump if its too low.