Hoping someone can give me some a solution. I have an 03 duramax that was running fine until one hesitant start, 5 seconds of cranking and it started, drove 5 mi home, checked wot to see if filter may be clogging, but no problem. Turned off engine ...5 hours later no start...cranks fine, scan tool says FRP 43...I get 2, check filter, no air, filter was clean. Air pressure in tank bled half a gallon at the filter in 30 seconds...Is their some electrical component that could suddenly fail that would keep the injectors from opening? Such as the fuel regulator?:help
dmtech
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858 Posts
Some more diagnosis should be performed to see if there is enough fuel pressure to fire it up. Any other things going on electrical wise like on the dash or anywhere?
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858 Posts
I'm not sure if your scan tool has the ability to run the tests needed to help pin point the problem. You need to read your rail pressure while cranking the motor to see what it is at. I believe it is supposed to have atleast 5500psi for it to start.
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