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dodges1515
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Contributing Member  (2 Likes)   Posts: 10Joined: Apr 2015
2012 FRT. M2 isc cm2250 10,000 hrs offroad. I have been fighting intermitten fuel drainback concern for over a year.No patterns, simply on any given morning it may or might not start. Exhilaration up much more frequently now.If you eliminate fuel supply pipe to piston pump the takes a while of cycling crucial and cranking engine come run equipment pump to get fuel come piston pump and when that does come that looks choose pink champagne (offroad fuel) lots of little bubbles.After cruising approximately fuel troubleshooting in cummins quickserve and doing my best at running their tests without every one of their correct service tools at one point I had two see through line hooked to the two male quick connects in ~ the ecm cooling plate through each line submerged in 3 gallon containers fifty percent full of fuel,the suction side heat container placed slightly lower than the push side container.After to run the electric lift pump while viewing fuel circulation i noticed the on certain occasions ~ shutting background pump off,fuel would siphon earlier through to suction next container till it emptied the push side container. Cummins call the check valve that is in the reduced ecm cooling plate port a "checkvalve" and in some instances they contact it a anti-fuel drain ago valve.Now after ~ removing that inspect valve it shows up all the does is check fuel in the cooler until equipment pump suction unseats it and also pulls fuel v cooler rather than drags fuel through the electric lift pump,(I think)it cant examine all the fuel since of the banjo fitting that goes to electric pump would permit fuel to happen in former of the check,(i think).The examine valve that is in the reduced port definitively checks. I gotten rid of my lift pump and also it go not appear to examine if friend blow v either way. Ns purchased a new lift pump and it does appear to have actually a examine of some sort, whether it is normally the result of the mechanical properties of the pump or a actual inspect valve I do not know.Also if the suction side of the mechanism becomes "system drainback" in my case ,where go the waiting come from that displaces the fuel as both system suction and also return and submersed in fuel in the fuel tank?Any feedback would certainly be appreciated.Lift pump passes circulation test.Gear pump passes engine cranking psi test and engine running psi also.No fuel leaks to atmosphere.
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