I'm trying to diagnose some problems with my fuel system. Can someone tell me if my fuel pressure results are normal. 97 s10 blazer

Key on only: 58/60 psi

Car in idle: 52 psi

Quick Revs of the engine: 58/62 psi

 

Yep! Good.


Now,question is this,Test it again,but when it hits 60 etc let it set for 10 minutes,and tell us what its held at.

 

There are no published specs for running psi, way too many variables, report back what the leak down is as previously posted. What is going on that you think you have a fuel problem?

 

I was told by a dealer it should no lower then 53 psi if I remember correctly...but the leak down test is what you should watch as the other guys have said....once you turn the engine off it should maintain that pressure (within 5 psi) for I think 1 minute I can't remember now...check out www.troubleshootmyvehicle.com or search on this site good info either place

 

Like chris said, see what it's at after 10 minutes. Are you having drivability problems, or hard starting?

 

Ok will do the leak down test today. Will post when finished.

The problem is when i try to go WOT the truck just bogs, never stalls. you here the intake sucking the air but the truck just bogs. if I only go quarter to half throttle the truck shift and is completely normal. It's not the cat either, I just replaced that a few months ago. I'm pretty sure it's something with the fuel.

 

How old is your fuel filter? If it's clogged, it could have symptoms like what you're experiencing.

 

Did the leak down test.


Starting pressure: 62
2min: 60
4min: 59
6min: 58
8min: 57 1/2
10min: 57

 

Fuel pressure is fine, try cleaning the MAF sensor with MAF safe spray cleaner.

 

fuels perfect. like 50lb said,get some maf cleaner (dont use brake cleaner) clean the maf up. maf can do some crazy things.