[hatzie]

Originally Posted by 80Sierra3500

Hatzie. I apologize. I didn't see the second page of the thread you mentioned. The electrical drawing of inside the valve explains much.(although the limit switches aren't shown, just the catch diodes for when they open.) As I understand it, the valve only changes position when the polarity of the applied voltage changes. IOW, you can leave the power on to the valve and it won't draw any current after it has shifted to the new position and the limit switch opened. wilkin250r's idea of applying negative 12V to the power terminal is intriguing. It should work fine.

Another interesting tidbit: after looking at the sender switch inside the valve, it looks like it could be adapted to drive relays to power right and left in-tank pumps.

There's only one SPDT Limit switch for the fuel pump motor. It is shown. The diagram is re-drawn from the Pollack literature and blown up to properly show the details. The limit switch moves to select the diode that blocks current till the polarity is flipped again.

TBI fuel pumps??? Do it like GM did from 1987 on... Wye off the valves' D & E terminal wires to the fuel pump hot terminals. The stock TBI sender/fuel pump power connection is a 2 position Weatherpack and the sender/fuel pump. Setup as GM did... The active pump will have power and ground and the inactive pump will have two grounds. You'll need to sync the valve position to match the active fuel pump by connecting the correct hoses...