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my truck cranks but will not start. i just changed the fuel filter if i press the accelerator while cranking it will start and run fine. someone told me it could be the pressure releif valve but i want to be sure before i spend the money to replace it. any help will be greatly appreciated.thanks Ross
 

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welcome to diesel forums
 

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Scan it and possibly test the fuel pressure. Test your throttle position sensor and or map sensor. you may have some funky readings or they just need to be cleaned. Get a service manual if at all possible. More then likely you might just need to clean a few parts and or sensors. This will help you find or fix the problem.
 
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