2005 6.0L Fuel pressure Specs

[Rflshootr]

Can anyone tell me the proper fuel pressure specs for a 2005 Silverado 2500HD with a 6.0L?

I'm trying to troubleshoot a P0300 code that only happens during highway driving. Thanks.

Edited November 15, 2016 by Rflshootr

[Swimmer8366]

I just did mine I'll check my notes

 

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[davester]

60 psi +- 5 psi. should be pretty steady, both at idle and at higher rpm. it can dip a little when you hit the gas, but should return to the same pressure when holding the throttle.

 

If the pressure drops or it can't maintain 60 psi at higher rpm, time for a new fuel pump (and check higher rpm, mine could maintain 60 psi at idle, so I thought it was ok, but then later I noticed that pressure would drop to under 20 psi when the engine was running faster).

 

you might also want to retrofit an in-line fuel filter (pre-'04 had an inline one along the frame rail on the driver's side). GM put a fairly crappy filter in the fuel pump, but crap can definitely get through that. cheaper/faster to replace the filter than having crap plug all the injectors.

[felipemolina]

It will be good idea if you get connected the scaner, and go for a ride, and monitoring the misfiring cilinders, if is only one or multiples, and you can focus on that, belive me is worth. Of curse check for cables, sparkplugs, and coils, and davester is correct about the fuel pressure 60 psi +/- 5psi with the key On and motor Off, idle and higher rpm. Hope that help, my 2 cents.

[Bill Morris]

Correct me if I'm wrong but doesn't OnStar keep one from engaging the starter from the ignition please enlighten me on this area in which I've dealt with practically never thank yall

[davester]

9 hours ago, Bill Morris said:

Correct me if I'm wrong but doesn't OnStar keep one from engaging the starter from the ignition please enlighten me on this area in which I've dealt with practically never thank yall

No.

[SierraHD17]

The starter will not engage once the engine is running.  It has nothing to do with Onstar.

Edited November 15, 2019 by SierraHD17

[Shane ashley]

On 11/15/2016 at 9:27 AM, Rflshootr said:

Can anyone tell me the proper fuel pressure specs for a 2005 Silverado 2500HD with a 6.0L?

I'm trying to troubleshoot a P0300 code that only happens during highway driving. Thanks.

Most common culprit with p0300 is gonna be one of your D.I. coils.

Is your OBD only showing a random misfire & not cylinder specific?

60-65 on fuel pressure