educate me about EFI fuel delivery conversion

ok, so i had origonally not planned on going EFI with my 70 duster build. things and tastes change, and now i AM going EFI. im debating between in tank or out of tank pump placement. i dont want to buy another new tank, and cannot weld good enough to put a sump in my tank. it is not baffeled, either, so theoretically it would have to be sumped.

that was until i found these: http://www.autoperformanceengineering.com/html/pickups.html

apparently the rock crawler guys are using one of these in all 4 corners of their fuel tanks, plumbed in series with hardline and very small sections of fuel submersable line (17 a foot at NAPA according to one thread.)

that takes care of the sumping issue roght there. ill be running 60PSI of rail pressure, using a C5 corvette fuel pressure regulator/filter assembly with the return line built in, and a single feed up tpo my rails. ill be supporting 400 at the rear wheels at the moment, but am planning 6PSI of boost from a centrifugal supercharger later on down the road.

so now my debate is about wether to put the pump in the tank like a stock EFI application, or run a rail mounted external pump. currently, i have a holley blue pump mounted acternally, and truly, truly hate it. with a passion. its really loud. will an aftermarket EFI pressure poump be the sanme? will it starve being siphon fed at my power levels? will it overheat and die quickly due to the pressure and supply demand?

this is a car that gets a LOT of street miles, and quite a few track miles (autocross and open).

if an intank would be preffereable, how would i go about getting it in there without cutting or welding the tank? how would i hook up the pickups to it?

lots of questions, a half baked plan, and searching for experience and advice. please help.

michael

How do you mount those valves? Inside the fuel tank, right? Do you JB weld them to the corners? I think I get the concept, but not the execution.

If you're going to modify the tank, you might as well do it right and have a shop modify it for a sump. That's what I'd do.

External pumps can usually hold up pretty well - the biggest danger they can have is having the fuel vaporize in their line if there's too much of a pressure drop, but if you keep things sane (unlike one customer we had with a boat who was trying to lift his inlet line eight feet through a water separator!) I wouldn't worry about the pump having reliability issues. On the other hand, external fuel pumps do need a bit of muffling if you don't want them to drone. Given that A-bodies don't have very much sound insulation as it is, this might not be the quietest option.