Join Date: Oct 2011
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It sounds to me like you're still having remote problems or a sticking pump solenoid. The changing pump speed may be a loose power or ground connection. If you have access you can test it out with a set of jumper cables and a battery.
My F450 has a power up/gravity down and I've replaced the flow solonoid twice in 5 years. This is the one that releases the fluid into the tank and lets the bed go down. In both cases it failed in the UP position! To get it down I had to loosen the valve and let it leak into a bucket. If you ever need to replace one be sure to get the new design with a manual backup.
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