Hi Robin,
I feel like I'm becoming the Harbinger of Doom, but the LP must have failed for a reason as most pumps go on for years. Are you sure there is no obstruction of the pickup pipe in the tank, certain that the pickup pipe isn't touching the bottom of the tank and therefore covering the end of the pipe which in turn will cause premature failure of the LP and the snowball effect on the HP.
I'm beginning to feel I should be there to help you as I am becoming as frustrated as you in solving this problem.
Phil
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