For those about to install one of these, if you haven't heard, several FASS owners have had trouble with the quick-connect that connects to the tank leaking air into the system. Don't use it and just clamp the line to the tank. You'll have to use a nut driver or socket/ratchet to get it tight enough. If you don't take the bed off (which you aren't expected to do) getting in there is tight but doable. Make sure no small children are around to hear you swear when you drop tools down between the tank and the frame rail.
Other tips from me and that I've heard from others:
- Removing the factory quick-connect on the suction line from the fuel tank was impossible for me. I had to cut the line to remove it.
- Assuming you don't remove the old factory fuel suction line, fuel will leak out of it for a little while after the install. Don't confuse this with a leak in your new system.
- Use fuel-safe thread compound on NPT fittings, apply it to the male threads, and close to but NOT all the way to the end (you don't want a blob of it in the fuel system). Tighten the fittings well, especially those on the pressure side. My NPT fitting on the pressure line to the VP leaked even though I though it was plenty tight.
- It's hard but do the work necessary to get the hose all the way on to the push-lock barbed fittings. Oil them and use a heat gun if necessary. They can leak if not, and using a hose clamp over them to cure a leak can make the leak worse (fitting barbs cut the hose).
- Route fuel lines carefully, remembering the bed is soft-mounted and can move relative to the frame when loaded heavy (avoid pinch points). Use lots of ties and check for wear/rub after a couple hundred miles.
Attention: TDR Forum Junkies 
It just seems that the pump would be more exposed back there.
, that's one thing that really like. Oo.
