Fuel injection with dual tanks- nice trick for return.

Ok, so I decided to fuel inject with the MSD atomic set up. But this will work with any set up. A little background. During my rebuild I replaced the entire fuel plumbing: all the lines, manual selector valve, sending units, etc. Even redid the charcoal can plumbing. Out with the old, in with the new. But before and after, I was chasing a vapor lock issue. Rerouted all the lines and hoses to distance as much as possible from heat- still vapor lock. Due to lack of hood clearance, I could not put a spacer between the carb and manifold (edlebrock performer RPM.) So---for that, and the other advantages ---- Fuel injected. Anyway, being I now had to run a high pressure system, my previously installed, brand new plumbing was going to waste. I wanted to maintain my dual tank set-up (didn't want a jerry-can) with the selector valve. But, the selector valves are only able to handle 9psi max. So, I decided to incorporate it in my return system. Without having to reroute anything. First, on the back of the selector valve, disconnect the common port output hose to feed the carb, and the "MAIN" port hose coming from the main fuel tank. Connect the hose coming from the main tank now to the common port of the selector which used to feed the carb. Now from the return side of the fuel pressure regulator needed for your EFI return system (no pressure on this side), connect the hose which used to feed the carb to the return side of the fuel pressure regulator. Now connect that return line to the "MAIN" tank input port on the selector valve. Now, with the engine running, the selector valve is in the "MAIN" position so fuel is returning to my main tank. ( I did put in a 23 gallon Sherman tank, but that isn't necessary) With the engine off, I can select "AUX", and with the help of the auxiliary fuel pump I installed in my auxiliary tank output hose between the tank and selector vale, I can add fuel to my main tank if needed because the selector valve output is feeding the main tank. Just remember to put the selector back to main before starting the engine ( I positioned the toggle switch for the aux pump to where I can only turn it on once the valve is switched to AUX. This set up works great. Hope this will come in handy for anyone else wanting to maintain the selector valve and aux tank set up with their EFI.