HELP! 3126 Caterpillar start issues

[middletontrucking]

Hello,
I have a 2002 gmc C6500 with cat 3126. Just recently I have to use starting fluid to start cold or warm. Sometimes the intake heater comes on and it will start. After it warms up if you shut it off it won't restart without starting fluid. any help is appreciated.

Thank you
Tim Middleton

 

[greasytshirt]

There's likely a high pressure oil leak. Take the valve cover off and crank it. Does oil flow out from around an injector? If there is, it's blown an upper injector o-ring.

It's also possible to blow an o-ring between the oil and fuel galleries. This will make the oil level drop and turn the fuel black.

There could also be a problem with the HPOP or IPR, but checking under the valve cover is the first step.