Crank NO Start 2002 2500HD LB7

[dgalvin66]

I have a 2002 GMC 2500HD LB7 with a Crank NO Start problem.
This happened about 4 years ago and turned out to be the filter head. I just replaced the filter head, filter and the 2 fuel lines coming of the housing and it still does not start.
I have a basic code reader that is showing no codes. I know someone that has a Tech II scanner and trying to find time for him to come over with it to see if it tells anything.
I do NOT have the money to just start throwing parts at it in hopes that something will fix it. Please tell me what to check and how to do it to try and determine the problem. What tests to run when I get the Tech II here?
Thank you

 

[2004LB7]

How does the primer bulb feel when pumping it? Does it get hard?

Have you tried replacing one hose going into the CP3 with a clear one to see if you are getting air in the line?

Do you have a lift pump?

 

[dgalvin66]

The truck is all stock, No lift pump.
I loosened the screw on the head and pumped the primer until fuel came out solid and closed it then pumped until hard.
No clear hoses, I replace the 2 hoses with OEM hoses, what a pain in the butt the do them.

 

[2004LB7]

Yes. Those hoses suck to replace.

When you introduce a large amount of air into the system like you did when you replaced the filter head and hoses it can be hard to brake the vapor lock. Typically you have to pump until hard, crank for a few seconds. Rish and repeat. You might have to do this a bunch of times to get all the air out. Sometimes it helps if you have a buddy pump the primer while you crank the engine over.

Lift pumps make this process a breeze

 

[dgalvin66]

I will try to bleed it some more and try it.

 

[2004LB7]

Some have had luck putting a little air pressure into the fuel tank. Like 2 psi. Just enough to help the fuel move up the line

 

[dgalvin66]

I am going to try bleeding and priming it again tomorrow. I will check to see if I have enough air line to run it to where the truck is parked and give that a try. what will that test tell me if it works or doesn't?

 

[2004LB7]

It's not a test. Just helps priming the system

 

[dgalvin66]

I purchased a bluetooth OBDII and downloaded some scanning apps onto my tablet. I'm not sure of what to be looking for but I did get a little info.
Desired Fuel Pressure 6090 = Actual Fuel Pressure 5960
Fuel Pressure not running is 145 psi
I pulled a few codes that my reader did not get.
U1000
B2961
B2973
B3138
Does any of this help with figuring this issue out?
what tests can I do to test the FICM or ECM and Injectors?

 

[2004LB7]

U1000 Class 2 Data Link Malfunction
B2961 Key left in Ignition Circuit BCM DTC
B2973 LF Door Key Switch Circuit Low
B3138 All Door Lock Circuit High

Only one of concern right now is U1000

Fuel pressure looks good. So maybe the reason for the U1000 is keeping it from starting

For testing the FICM & injectors, you'll need a scope and LCR meter