rough starting 03 duramax
 

runs fine after its been started. Has a new set of glowplugs in it and the starter isn't giving out. it takes a good 5-10 seconds of key turning to get her finally started...any ideas?

Have you tried replacing the fuel filter? If you have, check all your fuel lines to make sure it's not sucking a little bit of air somewhere.

sound like a leak on the suction side of the fuel lines.

try priming it till hard first and see if it starts quicker

if yes, check around the filter/housing. check the bleeder screw (common fault), cracked or damaged water-in-fuel sensor or even the housing.

also make sure none of the rubber hoses are cracked, etc. you can also replace the short hose on the output of the filter with a clear one to see if any air bubbles in the fuel.

thanks guys