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Hose coming off the top of the pump.

Right wheel well....shiny worm clamp.

Didnt get a chance to take a picture of my truck yet but this is the tube in question. Its at the front of the engine. In the picture, the right side of the tube connects to the driver's side injector returns. The middle of the tube connects to the top of the injector pump for its return. The...

Update!.... Took some time to check my truck out. First i removed the hose connection at the frame on the right side where the return tube comes down from the side of the engine. Blew through the return line that goes to the tank and it was clear. Could hear bubbles in the tank. Tried to blow up...

Thanks for asking this. It's been too cold to work on mine but i noticed a return hose on one injector, that didnt not have a clamp on it, was leaking and if i touched it the truck would idle different. I suspected a clogged return line also. Hmmmm.....said check valve...