You could be leaking somewhere such as the injectors/fuel pressure regulator or the fuel pump check valve
Aug 11, 2011 at 1:37 PM
CADIEMAN
✓Experienced Mechanic
3,544 POSTS
what is the fuel pump pressure?low pressured?
Aug 11, 2011 at 1:47 PM
WRENCHTECH
✓Experienced Mechanic
20,760 POSTS
This truck uses a variable pressure, computer controlled fuel pump so you need a scan tool to be able to determine if the pump is responding to commands correctly and the pressure sensor is reading properly.