Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
the first thing to do here is to check the fuel pressure,these vortec engines must have no less than 60psi at all times,the fuel pump may be weak[common]and need to be replaced.....this is where to start on your truck
Notice: Do not allow the fuel pressure to exceed 517 kPa (75 psi) . Excessive pressure may damage the fuel pressure regulator.
i didn't want you to replace the fuel pump without testing it.......if it tested well..we would have moved on