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Q:

takes 15 min. to fill gas tank.replacsd vapor vent valve; larger vapor canister; on 2000 Lincoln Continental

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vent line from fill point to tank is clear. could it be the smaller vapor canister? I not sure if they are connected in series. THANKS O. S.
(1) Answer
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I think there is a check valve at the tank inside the big rubber fill hose, it may be the problem. Some have this but i am not sure about this vehicle! That might be something to check into though.
thanks pushrod. I didn't know about the check valve. very well could be the problem. THANKS ORRINBLUE
You are welcome, had this problem with a mustang and a new check valve fixed that one! I dont know what might happen if it was just left out of the tank.