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Can anyone identify which connection goes where? Also, 4 is baffling. It's just a hose going into a little black valve. Nothing else comes out of it that I can see.

2yo vehicle and it's already backing fuel up the tube and shutting the pump off when filling. No codes. I just need to know what goes where so I can remove the lines and apply shop air in the right direction.

Thanks!

Fixture Gas Automotive exterior Machine Composite material
 
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