Question about 2002 Ford F250 Super Duty SuperCab

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7.3 liter will not start.

The low pressure side of the fuel system is ok, we have fuel to the filter and I would assume to the fuel rail as well. We decided to install a pressure guage on the high pressure oil line from the pump to the valve cover and when turning over the engine we see no pressure at all therefore no fuel pressure to the injectors. We thought maybe cam position sensor but we are not receiving any engine codes while turning the engine over. Is the high pressure oil pump knowing for quitting on these engines?

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  • b_maccarthy Dec 19, 2008

    We checked the level of the oil res. and it is right up, the crank case is also to the correct level. We thought for awhile that we were not cranking fast enough but we put chargers on the batteries to keep them up while trying to start this truck so I think we are cranking over fast enough. The biggest problem we have is we have nothing to connect to the computer to see what the computer is doing during cranking. We want to bring it to the dealer but with the really cold weather in Canada right now the dealer will not be able to look at it until the New Year so we would like to see if we could solve the problem ourselves. I am going to double check the oil level in the crank case and make sure it is not low. Thanks for the suggestion.

  • b_maccarthy Dec 22, 2008

    Going to try this today. Thanks

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Yes they are you stated that you have mech oil pressure did you install a gauge?. this is a fuel line pressure sensor on the right bank at the frt of the head this sensor is rail pressure that high pressure oil pump creates check you pressure there that will elimnate that head the other side is a little more of a pain to test. one other thing to keep in mind is that the cranking speed is very important, and have you checked the oil level on a 7.3 deisel if you are more than 3 qaurts low on oil you will trap air in the high pressure pump. this will cause a hard start our even a no start

Posted on Dec 19, 2008

  • kevin carpenter Dec 20, 2008

    i have one more idea to isolate whether it is elec or mech. if your standing in front of the mtr on your left hand at the frt of the head there will be a tube and on that tube there is a sensor that sensor is called fuel rail pressure sensor it mesure the amount of oil pressure coming from the high pressure oil pump . high pressure oil is what cause the injectors to open . the comupter only controls how long there open. remove the sensor and install a gauge, cranking pressure should be over 500 psi i hope this will help and good luck

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