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Over flow valve

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I f overflow valve opens at 14lbs then with stock lift pump how can it open to circulate and cool the pump? And speaking of cooling the pump, can my Edge Ez be causing my vp44 to get hot and cause failure. I now have a new style Edge Ez with the power switch in the cab. The old Edge Ez had corrosion inside the box so they sent me a new one for 99.00. Could the corrosion cause a short or cause pump failure. I am still looking for anything to explain pump failure. I have a list of people 9 mile long that tell me I weld on my 01 bed all the time and no problems.

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Hmmm... Now the fact of the old Edge box was mess up that give a bit of light to the fact of a possible short or simular cause a excessive current draw or loading of the pump. Anything is possible... But I glad to talk to others about the welding issues to verify the thought... As for the overflow valve it doesn't open till 14 PSI so i'm starting to suggest the 14 PSI as a minimum pressure to help in cooling the electronics and keeping the pump happy longer... There is no proof of this yet but I can say my pump is 113K miles and doing good...

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