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/13135-have-trouble-firing-up/ Share on other sites More sharing options...
Rob 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.If you have a manual priming pump does it feel as if there is resistance, or like your compressing air? Both of your filters should remain full when the engine is shut down. If they are draining back you could have the check valve inoperable, or an air leak in the system. Do you notice any seepage leaks from fuel anywhere?Rob Quote Plodding along with no job nor practical application for my existence, but still trying to fix what's broke. Link to comment https://www.bigmacktrucks.com/topic/13135-have-trouble-firing-up/#findComment-51763 Share on other sites More sharing options...
Timothy B Demarco Posted March 22, 2010 Author Share Posted March 22, 2010 If you have a manual priming pump does it feel as if there is resistance, or like your compressing air? Both of your filters should remain full when the engine is shut down. If they are draining back you could have the check valve inoperable, or an air leak in the system. Do you notice any seepage leaks from fuel anywhere?RobThe manual priming pump has resictance, and i am checking the lines for seepage right now. and also trying to figure out this check valve Quote Link to comment https://www.bigmacktrucks.com/topic/13135-have-trouble-firing-up/#findComment-51764 Share on other sites More sharing options...
Gambi80 Posted March 23, 2010 Share Posted March 23, 2010 Stand directly over the front over your motor and look down between the front of the head and water pump, you'll see a small fuel return line running from there down to the fuel lines near the injection pump. Follow that line (maybe 2 feet long or so) and see if there's any signs of seepage. I had that problem with mine...cranked and cranked it till it would finally start...it was seeping where it hooks to the head...it wasn't dripping, just damp. I replaced that line and it was good as new. Quote Ever wonder how a blind person knows when to stop wiping? Link to comment https://www.bigmacktrucks.com/topic/13135-have-trouble-firing-up/#findComment-51788 Share on other sites More sharing options...
Timothy B Demarco Posted March 23, 2010 Author Share Posted March 23, 2010 Stand directly over the front over your motor and look down between the front of the head and water pump, you'll see a small fuel return line running from there down to the fuel lines near the injection pump. Follow that line (maybe 2 feet long or so) and see if there's any signs of seepage. I had that problem with mine...cranked and cranked it till it would finally start...it was seeping where it hooks to the head...it wasn't dripping, just damp. I replaced that line and it was good as new.Thanxs for the help i found the problem. The starter was dragging not letting the engine crank faster. and the actuator was messed up Quote Link to comment https://www.bigmacktrucks.com/topic/13135-have-trouble-firing-up/#findComment-51822 Share on other sites More sharing options...
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