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i posted a couple days ago with this problem. i since ckeck the pressure with key turn on pressure is a 40psi but then drops to 0 after pump stop running. i changed the regulator for the sake of it . i cant seem to find any leaks anywhere. i was hoping the regulator would have fixed this problem to keep from droping the tank again i was reading in my hyanes manual to check the in tank fuel pump check valve. where is is this check valve located in the fuel pump because i didnt see one when i was taking the old pump out nor did i see one with the new pump. can i get some help please