If all your valves are in the correct positions, maybe you have a plugged screen ahead of the pump. Years ago, our SOB fifth wheel pump had stopped working, but was still running. Changed out the pump, but transferred the screen device to the new pump, without even thinking it was plugged. The new pump did exactly the same thing. I finally decided maybe the screen was the problem, and sure enough, completely plugged. Cleaned it, and worked perfect.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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