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Old 10-09-2019, 06:14 AM   #15
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Posts: 636
I didn't have to drop the tank. My vent hose just runs down from the top of the tank where the valve is, to the bottom where you can see it. In my case, the hose was indeed plugged with mud from bugs. All I did was stick a long piece of 6 gauge wire (with the rubber insulation still on) in the vent hose to break up the mud and dirt. Any type of long wire would work. (Maybe even the oil dipstick from a vehicle if it were long enough). I observed huge chunks of dried up mud fall down the hose, almost into my face . The key is to break the mud or debris loose without pushing it up the hose and into the tank. Just go slow and pay attention to how far the poker is up in the hose. In my case, the mud obstruction was only 18 inches up the hose.

After I cleared the mud out, I blew in the hose and my wife could hear the air when she listened at the fuel cap. My problem was solved. From now on, when I'm parked at home, I plug the vent hose to prevent those little wasps or muddaubers from doing that again.

Good luck.

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Old 10-09-2019, 06:41 AM   #16
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Join Date: Aug 2019
Posts: 3
Lift pump

So I found a bulletin from Cummins tsb100798, it basically says to move the lift pump from the ecm cooling plate and mount it on the chassis, this will help with heat and vibration problems. There is also a kit 9955799, from Cummins that includes lift pump, hoses with quick connectors and wire for remote mounting pump. When I removed lift pump and bench tested, it would run for a few seconds and then slow down and stop. With the new pump mounted on chassis all issues were fixed. The bulletin is for the ISB 5.9l engine.

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