I need help, i had the head gaskets changed in my 03 6.0 and now my truck is having issues starting. sounds like it is not getting fuel, changed the fuel pump and it started good for awhile and the started having problems later that day. What should i check now. It is not throwing any codes

 

What are you reading codes with? What else was done? Who did the work? What gaskets used? Why did you change the fuel pump? Just throwing parts at it? Did someone actually test fuel pressure? I would start there, but usually after the top end has all been apart, it takes a while to get the high pressure oil primed.

 

also check the FICM!!!!!! its really easy to test, just go to youtube and type in ficm test

 

does it have hard start cold, hot or both? the high pressure oil rail could have a leak inside the valve cover if not put on carefully!! if you have an air compressor take out the icp sensor and hook an air line to it,, listen for an air leak from inside one or possibly both valve covers.

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a high pressure oil problem will make it sound like a fuel issue cuz the injectors are driven off the high pressure oil