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Ok i have 3 fuel lines coming up through the frame in the engine compartment. I am wondering what do do with them. I know the big one (closest to the front of truck) is for the charcoal canister but i am not going to run one on the 350 so i plugged the line. One is the fuel supply so that one goes to the mech. pump but the other one is a fuel return line do i need that or can i just put a plug in. I am running a holley 600 4bbl carb if it matters.
 

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The large line gos to your pump,The return line you can plug.The line that goes to your charcoal filter is a vent ,I wouldnt plug it,I ran mine to the back of the truck and put a vent valve like the one on the rear axle on the hose,Keep it away from the cab to avoid gas smells .I guess you got your pump on???
 

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yep got the pump on, relocated the steering column over a little then moved the motor a little to the drivers side. worked good.
 
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