Could it possibly be in a vapor lock? I’ve had to make sure that the small line to the jug had plenty of fluid in it before it will pump. If it has too much of a haul for it, I don’t think it will pump.
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2011 GMC 4X4 dually CC, 6.6 Duramax with Allison Transmission. Formally 2001 Montana,2007 3400RL Montana, presently 2018 3401RS Alpine.
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