RV-7 Fuel Selector valve
 

Any reason not to use a left-both-right-off valve vs the kit supplied left-right-off valve?

Yes. Not good on low wing aircraft, because you have to suck the fuel uphill. If you are selected on both, and one fuel pickup is sucking air, you won't get any fuel out of the full tank.

If you do, I would suggest you block off the both position if possible.

This type of valve is generally used with gravity flow fuel systems, it is not really ideal for low wing planes------if you are in both, and one tank runs dry, you will be sucking air.

Probably shouldn't be in the Classifieds section...

Missed that, got it moved. Thanks for the heads up.

sucking air
 

Once it starts sucking air, it may take a little time for the elect backup pump to get it primed again, if it does at all. If you have ever been in one when it sucked air, it can be a rather discomforting feeling. Seems like, if I recall, the pucker factor maxes out while its takes it sweet little time re-priming....