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Buddy of mine has an 05 cummins that will crank but will not start. Took it to the shop and was told that there is fuel pressure past the filter. Worked fine and then didn't. I'm not sure about any fuel shutoff relays or what not so any advice would be greatly appreciated
 

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Have you changed the fuel filter recently? Sometimes air may get into the line and that will cause it not to start, and even though it is highly UNrecommended, have you tried just a tiny shop of eather, and I do mean a TINY shot?
 

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I would suggest a search of Rail Pressure sensor...I have heard of these not sensing enough from the CP3 and not allowing them to start.
 
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