I have a 2003 2500HD 6.0L I seem to have to crank for few seconds R try again to get it to start up! I have hooked up fuel gage to fual rail and get 48psi at idle and raises to 52psi when I press on pedal runs fine after starting. When I turn key off within 1min pressure drops to zero is this normal? If not where do I begin to solve problem? It seems to me that it should remain with some pressure after key is off so that it would start easy again. THANKS FOR ANY HELP!!!

 

It should hold pressure...probably need a new pump.

 

Is there any other part that I should test R go ahead and drop the bones on a new pump and filter? 75,000 miles on it. Could r would a fuel pressure regulator cause this? Do you recomend buying from dealer (delco) are another brand? Thank's Again!!

 

There is a valve in the pump that keeps the pressure from bleeding off. The fuel regulator only regulates pressure when its added to it. A new pump is the only way. A new pump AC Delco brand runs about $540.

 

Thanks, can you recomend another brand I just thought Delco cause I have read several places that the ones from Autozone are not good?

 

It is actually a Delphi unit and I have found them on eBay for a lot less. Here is one, but you need to verify the part number...
http://cgi.ebay.com/ebaymotors/New-D...item1e5ccc50bf

 

Thanks good Idea

 

Thank's Fuel Pump was bad and all is good!!! Thank you very much!!!

 

Cool, glad you got it fixed and thanks for posting the results!