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i have a 2003 3500 and am having trouble starting truck when hot. i changed the lift pump and still no help. what are the symptoms for bad cp3 pump,truck runs fine other than the start issue,thanks for any help.
 

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If you shut the truck off and try to start it. Does it start? Does it have any codes while cranking? If not then you probably have one or more injector(s) with internal leaks. This leak will not give you a miss. Usually you will show a low rail pressure code.
 

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truck has cam position code, replaced cam sensor, truck started fine till i hooked edge back up, now cam position code is back and slow hot start again
 
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