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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 actually been fighting intermitten fuel drainback problem for end a year.No patterns, simply on any given morning it may or may not start. Acting up more frequently now.If you remove fuel supply pipe to piston pump it takes a when of cycling vital and cranking engine come run gear pump to get fuel to piston pump and also when the does come it looks choose pink champagne (offroad fuel) lots of little bubbles.After cruising about fuel troubleshooting in cummins quickserve and doing my best at running their tests without all of their correct service tools in ~ one allude I had two see v line hooked come the two male quick connects in ~ the ecm cooling plate with each line submerged in 3 gallon containers half full the fuel,the suction side line container inserted slightly reduced than the pressure side container.After to run the electric lift pump if viewing fuel circulation i noticed the on specific occasions after ~ shutting elevator pump off,fuel would certainly siphon earlier through come suction side container till it emptied the push side container. Cummins calls the check valve that is in the reduced ecm cooling plate harbor a "checkvalve" and also in some instances they contact it a anti-fuel drain back valve.Now ~ removing that inspect valve it shows up all that does is inspect fuel in the cooler until equipment pump suction unseats it and also pulls fuel with cooler fairly than drags fuel v the electric lift pump,(I think)it cant inspect 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 inspect valve that is in the lower port definitively checks. I eliminated my elevator pump and also it go not appear to inspect if friend blow with either way. I purchased a new lift pump and also it does appear to have a inspect of some sort, even if it is it is normally the an outcome of the mechanically properties that the pump or a actual inspect valve I do not know.Also if the suction side of the system becomes "system drainback" in my situation ,where go the wait come from that displaces the fuel together both mechanism suction and return and submersed in fuel in the fuel tank?Any feedback would certainly be appreciated.Lift pump passes circulation test.Gear pump overcome engine cranking psi test and engine running psi also.No fuel leaks come atmosphere.
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