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if you look on the rear top of intake maifold on top of engine you will see two fuel lines that come up from the back of the engine & go into the manifold. there is a 5/16" and a 3/8" one,,, the smaller of the two is the return the larger is the "feed" line. if you are under the vehicle, they run up the frame on the drivers side, But be careful as there are actually four lines that usually run up the frame together! the 3/8" one is the fuel feed, the 5/16" one is the fuel return, and there will be TWO 1/4" ones, one of which is the vapor line going from your tank to the charcoal canister in the front of truck, the other one will be your rear brake line that runs from your abs unit up on the fenderwell all the way back to the crossmember above the rear axle where it screws into the end of a high pressure rubber line that goes down to the rear axle..
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