[TitaniumTT]

Basically saying use the circuit opening relay to power the lift pump when that time comes. To do that I would cut the B/LG wire that jumps between the EGI relay and the Circuit Opening relay. Run that B/LG back to the ECU as the FP trigger. B/LG does exist in tefzel.

In that area where the PDM will be mounted, mount the two safety switches and that big Bosch Tyco Relay. Use that larger 70A relay now to power the main pressure pump. Later down the rd when you go surge tank, the wiring is already there in the form of the circuit opening relay to power the low pressure lift pump.

The switches look like this.....



From the ECU the signal wire gets split to both switches. (yes the switches are being used backwards as far as conventional thinking goes.) When the safety switch is closed, the wiring will be as shown above. The ECU will control the fuel pumps as intended.
However, what if you need to depressurize the fuel system? Open the switch covers and flip them to the center no contact position. Car running, signal can't get to the relays, pressure drops until it stalls.
You changed the pump or this is the first time filling the system. Fuel will be in the main tank, but not the surge tank. Turing the key and trying to start the engine will run the main pressure pump until the the lift pump fills the surge tank enough. This is very bad. Open the cover for the lift pump and flip the switch past the center mark to the momentary position which latches to ground. Lift pump fires and fills the tank. Same thing for running the main pressure pump to check for leaks or set base pressure.

It adds a whopping 10 minutes, $30 in switches and covers, but well worth it as opposed to trying to jump relays and pull relays and blah blah blah....

Sensical? Logical?