Fuel pump shutoff toggle switch
Roger, I did the same thing, only on our engines, the concept is backwards: to turn the pump OFF. Our M25 has a remote fuel pump that works all the time. To bleed, it's easier to have it off, but cumbersome for one person to go back and forth to the key switch in the cockpit. A simple toggle switch located in the engine compartment tied into the wiring to the fuel pump lets me turn it off when the bubbles stop and fuel flows. Only usually have to do this on the secondary filter, since when changing the primary Racor the electric pump and the knurled knob on the rack bleeds the engine easily.