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Discussion Starter · #1 ·
I am helping my brother put together an old Mach 1 with a King Cobra and we installed the trim pump and lines and can get it to go up but not down. The pump runs when trying to go down but nothing happens .If you loosen the line it will physically go down ,but it seems the pump will not pressure it down. I need help figuring it out any suggestions ?
 
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