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Where is lift fuel pump? if retrofit should be relay somewhere and that looks like feed to ds battery
the hose is used to allow VC to breath goes down side of block to atmosphere
Looks like engine block grounds, ECM and block itself.
 

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03 pump from factory would be on fuel filter canister, if not there then probably retrofited in to fuel tank or external aftermarket under truck , follow the fuel lines.
Otherwise only way to be 100 % is find the other end , with continuity meter check wires on fuel tank wires.
 
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