1996 c3500, 6.5 turbo dies after about a block. want start back up unless i crack open an injector and bleed out air. go about a block same thing. has new lift pump, rebuilt ip.rebuilt inj, hot wired shut down sol, lift pump, new pdm under bumper, ran fuel line strait to ip..from a can, starts and idles fine, no smoke,no codes. any help other than going to an older pump( none ele)so i can go more than a block

 

cracked fuel line between lift pump and fuel tank, fuel pickup tube damaged, plugged in tank filter causing it to draw air from a fitting, lift pump inop (new and good arent the same thing), faulty lift pump wiring/circuit. a clear piece of tubing at the fuel filter would probably answer if its air injestion causing the failure or not. does it die if you crack open the filter bleed while idling or spray fuel?

 

as i said in post, lp hot wired to battery,same for shut down sol, fuel line coming from can in back seat strait to ip bypassing all fuel lines and filters, ip rebuilt. worked at cummins diesel for 16 yrs,hen 14 more at fed ex on thier diesel flight line equip. but the 6.5 is new to me. tried to find a cummins but this was all i could find.

 

you cant bypass everything and go straight to ip from a can, it has to have a lift pump in the equation. If you are as experienced as you say then you would understand that if you can only drive a short distance then it dies and the air has to be bled from the injection pump you more than likely have a fuel supply and or air ingestion issue.

I posted to try to help you, if you just want to tell me how qualified you are and ignore everything i have to say im out.

 

thanks for trying to help. of course there is another lp in the line from the can.you can add another 20 yrs as a motor pool sargent. i know most diesels ,but the 6.5 is a whole new thing . i need help on this thing of course , never seen anything like it. you know of anything inside pump that would block fuel other than the sol?

 

there is a filter screen at the inlet of the injection pump.

 

https://www.dieselbombers.com/chevy-...ir-manual.html anything and everything you could ever want, need, want to forget about 6.2's and 6.5's.

 

It is ok for the mechanical aspects but is not helpful at all with the puter controlled stuff used in the civilian vehicles, military stuck with the non EFI for mechanical for EMP "battle hardening" .

 

Yours being a 96 is OBD-II diagnostics, so you can go to auto-zone or others for free look at failure codes, I suspect if your PMD is still mounted on the IP that is your issue as it is #1 culprit for trucks just dying and shutting down.

That said a couple of things to check before going there, clean grounds ALL OF THEM, there are about 15 sub circuits for the GM 6.5 each with it's own ground, so more than just the gnd terminals on the battery to block but those need to be clean as well.

All sensors send info to the PCM so low voltage to those via bad/poor gnds can cause funky inputs to PCM resulting in low/no output from PCM.

Pass side aft rear intake manifold stud is the gnd for the PCM if broken or dirty will cause intermittent shutdown www.leroydiesel.com sells new PMDs and remote mounts at reasonable price .

Clean your gnds, see if that helps, post codes and report back

Here is basic info from a thread myself and a couple of others put together a while back when I was posting at that site 6.5 Engine Diagnostic Troubleshooting Checklist | The Truck Stop

 

For 96+ 6.5 no need to "hot wire" a lift pump as it gets 2 power sources and you have to lose both for that to be a factor, on top of that unless you have a leak in the suction between the lift and the fuel tank the IPs own internal transfer pump is strong enough to supply basic fuel needs .

Hot wired lift FOR TEST ONLY running as a permanent fix is not safe, in event of a crash you get knocked out, or forget in the chaos in the crash event, and lift is still powered from battery "hot wired" switch then there is a potential of feeding fuel to a fire before you can shut off the power to the lift.

Better ways to check for fuel delivery issues, search for several my posts last year on the topic.