When I disassembled the PA18 I found 3 big problems in the fuel system:
1 Fuel selector leaking
2 Front header was repaired with some kind of "epoxy" adhesive
3 original fuel system with no "both" position in the fuel selector.
Me and my brother, eoliverosh did a lot of research in the forum about fuel selectors and I finished purchasing 2 different fuel valves,
1 ANDAIR luxurious fuel selector (really nice) but it had a connection in the behind of the valve. $327 + shipping
2 ALLEN FUEL VALVE 6S1001 (not as nice as the ANDAIR one) but had the same problem as the first one. and $511 + shipping
Both had being returned to spruce.
Then I realized that the due date for making the plane flying is getting close, had no fuel selector and no front header tank.
I talked back to my brother and discussed about that, and we got to the conclusion that some paperwork of STC, replacing some parts of the aircraft is worth because of the safety improvement and functionality enhancement.
Also the header tank is +$250
Did we got to the right conclusion?