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FIX IT MAN, Master Technician
Category: GMC
Satisfied Customers: 17368
Experience:  Master Automotive Technician
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I have a 2001 gmc sieerra 2500 HD LB7 Duramax I started

Customer Question

I have a 2001 gmc sieerra 2500 HD LB7 Duramax
I started gettig long cranking starts
now truck will only start if plugged in
(motor warm)
I rebuilt the fuel filter housing new o ring kit worked for about 5 days
back to long start if warm
no start if cold
Submitted: 1 year ago.
Category: GMC
Expert:  FIX IT MAN replied 1 year ago.

Hello, my name is Bobby. Thank you for the question. If it will only start when it is warm it sounds like you may have an issue with the glow plugs or there may be a drop in fuel pressure. Typically it is bad glow plugs or a bad glow plug module. Is the check engine light coming on at all?