T into the line on the suction suction side of the lift pump and it'll be ok.
As you said this is a temporary setup to move the truck. Once you fix the fuel tank issue you can plumb it back the way it was.
I have a 2nd gen 5.9 with the P7100 inline inj pump, the injector return is routed to the inlet side of the fuel filter and the pump return goes back to the tank.
There is not air in ether return line coming from the pump or injectors.
The primary reason fuel is returned back to the tank is to cool it during warm weather and to help heat the fuel in the tank in cold weather for better flow and less chance of gelling.
Since the engine burns some of the fuel there's alway less returning from the engine than has been pumped to it there forth returning fuel will not overpressure the suction line blocking flow to the lift pump.
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Today's Featured Article - Hydraulics - Cylinder Anatomy - by Curtis von Fange. Let’s make one more addition to our series on hydraulics. I’ve noticed a few questions in the comment section that could pertain to hydraulic cylinders so I thought we could take a short look at this real workhorse of the circuit. Cylinders are the reason for the hydraulic circuit. They take the fluid power delivered from the pump and magically change it into mechanical power. There are many types of cylinders that one might run across on a farm scenario. Each one could take a chapter in
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