2001 Duramax loses fuel pressure and battery dies while parked

[jgroppoli]

I have a 2001 Duramax 6.6 liter that if it sits for sometimes as short as 4 days or sometimes as long as a week, will not start. I have to manually prime the fuel system in order to get it started. It will then run fine. Again, it can sit over night or for several days and start without any problem.

The starter battery will often be dead at the same time, although they tell me they're not related. There have been no modifications made to it.

 

[garychev]

I had that problem on my 2001 , for me it kept getting worse with time and eventually wouldnt start at all just ran off prime and shut down, turned out to be rusted fuel lines for me it was getting air

 

[duramaxdiesel]

Sometimes I know that the fuel filter head causes problems. There was a seal or something that I had to change in mine because I had to prime it every few days or it wouldn't start like yours.

Nick