s700 2-50 switch to fuel pump

fstringham7a · #1 07-14-2007, 04:03 PM

I am wiring the electric fuel pump in my FI RV7A to a S700 2-50 DPDT
(ON)/Off/ON Switch. Momentary up for prime and full on down in case the main pump goes south. How do i wire up this switch to the pump.

Frank @ SGU RV7A Panel/electrical/ FWF engine getting close

Walt · #2 07-14-2007, 05:25 PM

I have my pump switch wired for fuel pump and purge valve which is really identical to your prime system (uses the same prime valve). I wired it so when the switch is down it is "off" (like all the other switches), middle position is "on" which turns the pump on, and the up "momentary" position activates the priming valve (pump also runs in the momentary position). So I have an; off/on/(on) switch.

fstringham7a · #3 07-14-2007, 06:57 PM

Quote:

Originally Posted by Walt

I have my pump switch wired for fuel pump and purge valve which is really identical to your prime system (uses the same prime valve). I wired it so when the switch is down it is "off" (like all the other switches), middle position is "on" which turns the pump on, and the up "momentary" position activates the priming valve (pump also runs in the momentary position). So I have an; off/on/(on) switch.

Walt, thanks for the help.

I also found the info Pages 11.1,11.2,11.3, and figure 11.1 on page 11.2 in Aeroelectric Connections.

Frank @ SGU RV7A panel/electrical

scard · #4 07-14-2007, 07:14 PM

I have off/on/(on) for my fuel pump. After only having flown for about 12 hrs, I can already say that next time, I'll install a switch with a lockout of the up/momentary (prime) position. A number of times, I've been very paranoid that I would engage the primer when bouncing around and turning the fuel pump on or off.