Timothy B Demarco Posted March 22, 2010 Share Posted March 22, 2010 On my 1995 CH 613 with a 300 Mack motor in has hard time firing. I put on all new filters and was wondering if a drain back valve could be bad. The motor has a Primary and a Secondary fuel filter the Primary fuel filter sounds empty and the Secondary sounds full. The pump actuator solenoid is working. Need a little help here. Quote Link to comment https://www.bigmacktrucks.com/topic/13136-have-trouble-firing-up/ Share on other sites More sharing options...
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