Fuel line problem

[muleunit]

My car has this strange problem where it wont run if the hose that connects to the fuel pressure regulator isnt in the right position? When the cars running if I move the hose around the engine dies. If you look at the picture, its the hose im pointing to, Ive changed the line to a shorter hose and it wouldnt run at all. The car only runs when the hose it up in the air like that. My fuel pressure is a steady 38-40 psi if I move the hose and kill the engine. Does anyone have any idea whats wrong?

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[rarest_90_DsM]

that is very strange have you looked in the hose to make sure there is no obstructions? Does it leak at all? whats your fuel pressure with the vac hose off?