Fuel pump issue?

[Red Rider]

Ok, so I got two codes pop up on my 2004 tahoe z71 with Z flex engine. 5.3L.

0171 and 0174, fuel too lean. I took a fuel pressure gauge and tested it. It came up as 42psi when idling. If I accelerated, it drop down a bit, then back up above 42, but then settled again in the 42 psi range.

From what i read, it could be fuel pump or filter. Does this make sense? I picked up a Duralast fuel filter from Autozone and was going to try this first.

 

[Red Rider]

Also, what brand fuel pump have you used?? I was leaning toward a Delphi. Do the kits come with seal, fuel gauge sender, etc?

From what I saw, it seems you may need to replace the ring that secures the pump in the tank? Did not see a part number for this ring.

 

[SLCHOE]

Doesn't sound like a fuel pump issue.
Sounds like your intake manifold gaskets are leaking.

 

[Red Rider]

is there a good way to test if intake manifold gaskets are leaking?

 

[redemn93]

use carb cleaner, spray around the intake base gaskets. if the motor reacts at all, there is your problem.

 

[Red Rider]

Thanks. I will try that.

I was looking in the FSM and could not find the information on fuel delivery. At 42PSI, is it cause for concern? What should fuel pressure be?

 

[redemn93]

i think you are fine with the fuel pressure. a lean code is caused by other issues. look for vacuum leaks, leaking intake/tb gaskets, lose intake duct hoses, clean the MAF and TB while you are at it.

 

[Red Rider]

I can't seem to find anything on fuel delivery, MAF, TB, etc. in the FSM. I will do a search.

Thanks.

 

[ccapehartusarmyINF.(ret)]

fuel pump symptoms is engine wont start on every ignition turn some times it takes 2 or three turns i know this because i just replaced my fuel pump a year ago
and an OEM fuel pump on amazon is 60 bucks
just a tip driving around with a quarter tank or almost on E all the time severly shortens the life of your fuel pump

 

[redemn93]

fuel pump symptoms is engine wont start on every ignition turn

exactly. also will drive very erratically. like someone has an on off switch on your motor and they are just f*cking with you. your problem is elsewhere.