03 gmc sierra duramax diesel lb7, batteries died, replaced batteries and now truck wont start unless i prime the fuel pump, runs for about 30 seconds then shuts off, if i prime the pump again it will start but then die. is it my fuel pump or something else?

SOURCE: 2003 GMC Duramax Diesel won't start

I see that you had the injectors replaced 20,000 miles ago. I would still check the oil to make sure it is not overfull. The new injectors could be bad. If the oil level is not overfull then get a paper towel and touch the dip stick tip on the paper towel while oil is on the dip stick. If it's only oil it will not spread. If it has diesel in the oil the oil with spread. If this test doesn't show the injectors to be bad then you have three other possibilities. The FICM (fuel injection control module), the fuel pressure regulator, or the injection pump. It's hard to pinpoint what the problem is without running more tests and the only way to run those tests is with the computer the dealership has. Just so you know your injectors are still under warranty until 100,000 miles. Most likely you will have to take it to the dealership to get you truck fixed. I hope this helps you some.

SOURCE: 94 GMC truck diesel starts,runs and then dies and will not start

I have the same problem and have trouble codes 35 and 36. I found out that there is a computer module that needs replaced as it sits low in a valley and gets hot and seperates. I am reseaching about the a/m fix that installs the new module away from heat.

honeymokey

• 3113 Answers
• Posted on Dec 13, 2009

SOURCE: 1998 gmc 2500 wont keep running

The anti thieft system is keeping it from running.

SOURCE: 1998 gmc sierra k2500 wont stay running

you'll need a professional computer to reset how ever there are two relays for fuel on chevrolet
i would suggest finding the second one first

SOURCE: 1998 gmc 2500 sle 5.7 wont stay running

this is in fact the right answer check the oil guage in the truck it should read about 375.