I'm at my end with my cousins truck. Continually loses prime the longer it sits. Usually within 1 hour of being shut off it already cranks extra long to start. By 24 hours it won't start. Usually pulling fuel filter and replacing it will get it to start. We have replaced fuel filter housing and lines around it. We have tried running a fass lift pump. We have replaced the cp3 ?, the injectors have been tested by 2 different diesel shops. Still has the same symptoms. Just yesterday I laid under truck near fuel tank and did notice a leak where soft line coming from fuel sending unit connects to hard line. It is the line to pump not the return line. Please any idea would help.
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