Originally Posted by
jimboagogo
I have done some research on this DTC and it appears usually the cause orriginates on the supply side of the fuel system.I have a max of 5" on the supply side,no air in the fuel.I have done a return flow test on the injectors and all is Ok there.The data stream shows that the balance rates on the injectors is in acceptable range.I tried a regulator,a rail pressure sensor,when you try to test the regulator it doesn't want to go anywhere other than 30%.It will start fine cold but after it get's to opperating temp it won't restart,the rail press.won't build.I don't like to just change parts because they aren't cheap and very labour intensive.I couldn't find much info on checking the high press.pump.The desired and actual fuel pressure are not really close untill you rev it up.When you drive it they are way appart when you drive it hard.I think it's the pump but I would like to be ceterain.