Tonywham Posted February 12 Share Posted February 12 2016 CXU613 Pennical MP7, starts fine when ran daily but if it sits for 48 hours it will start for a second then die requiring cranking for 20 seconds to start. Acts as if fuel is leaking back in the lines. I'm assuming that it might be a faulty fuel check valve but where is it? Or am I missing out on something else? Quote Link to comment https://www.bigmacktrucks.com/topic/75153-mp7-fuel-check-valve-location/ Share on other sites More sharing options...
Joey Mack Posted February 12 Share Posted February 12 Injector cups is likely the issue. Check valve is in the fuel filter pad, if i remember correctly, and the line at the rear of the head on MP-7 has the regulator in the fitting. If memory is correct.. MP-8 is at the front of the head for sure... 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75153-mp7-fuel-check-valve-location/#findComment-569185 Share on other sites More sharing options...
Tonywham Posted February 13 Author Share Posted February 13 Thank you! I will try to find it Quote Link to comment https://www.bigmacktrucks.com/topic/75153-mp7-fuel-check-valve-location/#findComment-569210 Share on other sites More sharing options...
Joey Mack Posted February 13 Share Posted February 13 If you pump the hand primer, will it start quicker, I have also replaced a handfull of fuel filter pads on MP-7's due to primer leaks. The old style doesnt have a replaceable primer, . Quote Link to comment https://www.bigmacktrucks.com/topic/75153-mp7-fuel-check-valve-location/#findComment-569211 Share on other sites More sharing options...
The Heinz Posted February 13 Share Posted February 13 There's an overflow valve on the front of the head, I think on both MP7 and MP8. Looks like the below: 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/75153-mp7-fuel-check-valve-location/#findComment-569234 Share on other sites More sharing options...
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