Plumbing two tanks

My 69 has both the under the seat and the 15 in the rear. Since the motor is out and I'm waiting for the machine shop to get it done I'm tackling the fuel system.
I removed a lot of the pumps and hoses today as they needed replacement. I think it was set up to run off the front tank and then pump from the rear into the front. Darned if I can figure how it worked and I'm not crazy about it anyway. The front tank vent was sealed which I found odd. There was a pump with one in and one out, a filter and switch between the seats with another pump under the the body. That pump had an input from each tank the output went up to the top pump and then to the motor.
Anyway, my thought is to just put two pumps one for each tank feeding into a tee and going to the motor. Run either one dry and just flip the switch to the other tank.
Am I thinking right at all?
How have you done it? Help, I want to get this done today.

 

I use the stock V6 fuel pump
I have dual under seat tanks
venting is accomplished thru the gas caps (read very poor seal)
connect both outlets to a changeover valve (manual or electric) mine is underneath, between the seats, and is electric.
2 lines in, 1 line out to fuel pump
I have fuel filters between the tanks and the valve, keeps the valve clean and functioning
I use rubber hose from tanks all the way to the pump; steel line from pump to carb; manual adjustable pressure regulator between pump and carb for slow rough crawling.
If you have tanks with fuel return lines, they make changeover valves with the extra fittings to accomadate that function; or you can block them off, your call.
I use a single throw, dual function, 6 terminal (?) toggle switch to activate; both my tanks have sending units; so by throwing the switch, I not only change the tank but the fuel sending unit as well.
Manual valves work just as well and give you that one "empty" position for theft protection.

 

Jim,
Any suggestions on where to get a change over valve?
That sounds like a good system. Any reason why I couldn't use an electric pump instead of the stock since I don't have a stock and I do have an electric?

 

local auto parts store should have both valves
or RV/trailer supply house, Camping World etc
electric pump is okay, finding a mounting place close to both tanks could be a problem
others here will have suggestions for electric pumps

 

Used to buy them a Napa had manual and electric type.

 

I'm running a stock saddle tank and a stock rear tank. I used a simple six port pet**** from a mid 70's Ford pickup mounted between the front seats and a three way toggle switch on the dash to switch the sending units. Total cost in adjusted dollars.....20$

 

When I had this setup on my '73, I put the manual valve in the floor in front of the driver's seat. The valve is a standard thing from a RV supply or such. I would run the under-seat tank to empty (no gauge) and then switch to the standard under-floor tank. I'd suppose you could make a toggle switch to go between the senders in the two tanks. IMO you're making the system too complex if you use electric valves, transfer pumps, etc.

 

Thanks guys. My electric fuel pump was dead so I ordered a mechanical. I'm going to take your advice and get a changeover valve and mount it between the seats. My under the seat tank has a gauge, so I think I'll run the back dry then switch to the under the seat tank.
Should work good.
This is my first jeep and I am having SO much fun learning and doing. Spent the morning gathering up all the pieces for the switch to HEI.

 

i used the switch over switch from a gm truck. they are on the dash and make for a trick look. the part that does the switching ( also from a gm truck) is underneath the floor between the seats. if you would like i cpuld take picks.

 

Thanks, that would be great. Any idea what year GM?