Medium and Heavy Trucks
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Hi, my name is ***** ***** you for asking your question, I will try and help you out.
Most likely you have a leak on suction side of fuel system, this can be a hose, fitting, or more likely fuel/water separator.
fuel/water separators can crack over time it's a common issue.
I would bypass truck fuel system by running engine fuel system out of a clean bucket of fuel (5 gallon works well) take fuel line off fuel pump on back of air compressor (big line) run a hose from that fitting into bucket of fuel, prime system and get running.
If runs then bypass one item at a time before that point back to tanks to find what is leaking.
Any issues let me know I'm happy to assist.
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Questions or problems let me know I'm happy to assist.Thank You,spanky