Fuel pump swap, what involved?

[landpro00]

Hello again everyone!!!

First let me start by telling you what I've done so you know why I'm thinking of swapping pumps. About 6 months ago know, I swapped out my fuel injection, reluctantly, to a carb setup on my '88 with 454. About 2 weeks ago I had to replace the fuel pressure regulator originally installed, a Holley, with a new Mallory(MODEL MAA-4309 at Summit) one after the Holley one blew its seal from the pressure.

Hooked up the new Mallory regulator to the fuel supply line the Holley was attached to and then hunted and found another line that the shop that did the swap out had plugged and assumed it is the return line. If anyone could verify that one of the 2 lines connected to the throttle body is a return line that would be great!

Last week not sure yet, but i think, my tank switch valve went out. So was wondering if sending 44 PSI fuel pressure(50 PSI from pump,minus 6 to the carb) back to the switch valve through the return line could have been to much for the switch. I would think it would have been getting about the same return line pressures with the original setup or was pressure reduced somehow as it made it's way through the throttle body and back out?

Well, hope ya'll are still with me, I know this is kinda long but trying to give as much detail as I can!!!

My MAIN question is this: How hard would it be to swap out the factory fuel pumps in the tanks, with some lower pressure aftermarket electric pumps? Do the factory fuel pumps(in tank models) in older or non-fuel injected trucks have lower PSI pumps in them and would it be an easy swap out? Or would I have to, say, mount two electric pumps under the hood and somehow tie them in to the factory hoses and wiring so my tank select switch and fuel gauge still work?

All input GREATLY appreciated!!! THANKS!!!

Anyone else attempted this before? If so, how did it turn out?


Scott