[Tx Firefighter]

I've always put an inline filter underneath the cab between the two sections of metal line.

I have never felt that there was an issue doing it this way for the following reasons.

1) The fuel pump is happy to suck fuel out of the tank at the very back of a Suburban and along the frame rail to the engine. This shows me that the pumps are hearty and able to pull fuel happily.

2) The fuel level is above the fuel pump. Gravity is doing most of the work anyway. Once the lines are full, it acts on a siphon principle anyway. Pluck the rubber line off your pump and point it away and it will drain fuel out of the tank all day long.