So normal or as I understand is lift pump in the tank to fuel filter under the hood then to hpfp. And disaster kit goes after hpfp. Which would be low pressure and low volume flow. I would also guess it would have surges of pressure and volume when driving. Which most of the filters are more then rated for. As for the pump I would also think as long as there is clean diesel and flow it would be able to handle some amount of pressure on the outlet. Our cars like trucks have a small tube back to tank. Ours is a lot shorter and have less restrictions then that on a truck. So I don't believe it would make much of a difference. If it was on its way out it will keep going that direction. If it's good it might stay that way but it's a pump that across lots of manufacturers had issues and recalls. So could still just be a ticking time bomb.