Cubcrafters STC# SA00415SE headerless fuel system

[oliveros]

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?

[Steve Pierce]

I think you got the wrong Allen valve. One is a direct replacement for the original Piper valve and was used on later Super Cubs. Univair and F. Atlee Dodge have heavy duty header tanks that are stronger and less prone to rupture than the stock ones. I have installed and flown the Cub Crafters headerless fuel system and like it very much. It does require you weld a fitting in the front of the right fuel tank.

[tempdoug]

If you want a new front header tank - www.fadodge.com - and if you want a new fuel selector - www.univairparts.com you could possibly try these. doug

[smitty172]

Just got done installing per there drawings all the fuel lines and fuel valve.
not bad just took a while to get the right forward fuel line to fit right.
I think the loss of that fuel in front and behind you will be a added safety benefit. Also looking forward to the both option on the selector. Only down side was I think the STC was a little on the pricey side.

[behindpropellers]

I think you got the wrong Allen valve. One is a direct replacement for the original Piper valve and was used on later Super Cubs. Univair and F. Atlee Dodge have heavy duty header tanks that are stronger and less prone to rupture than the stock ones. I have installed and flown the Cub Crafters headerless fuel system and like it very much. It does require you weld a fitting in the front of the right fuel tank.

The correct allen valve is the 6S10008. This is the four way valve for a headerless system.

Tim

[Crash]

Cub Crafters "headerless fuel system" STC is best installed at complete tear down. It can be done on an assembled Cub but it is a real hassle to do.

I would just replace the bad header tank with a HD model from Univair or Atlee Dodge and replace the valve with the "new style" Cub replacement from Univair. Without the Cub Crafters STC the valve should be Left, Right, Off, Off.

When you change to the headerless system you just drill out the valve shunt so it's Left, Right, Both, Off.

Take care.

Greg

[charlesf]

Another option is a Maule fuel valve. Cost is $75 plus $75 for the STC which is available from Trimmer Aviation in Willow, Alaska.

[Wag2+2]

When you change to the headerless system you just drill out the valve shunt so it's Left, Right, Both, Off.
Greg

I bought a Allen 6S122, used, for my Wag 2+2 project. Was told the valve had Left, Right, Both and Off. Should have done my research as it only has left, right off and off. I'd like to think I could drill a the shunt valve rather than getting a different valve. Is that doable with the 6S122? Thanks, Peter.

[mike mcs repair]

When you change to the headerless system you just drill out the valve shunt so it's Left, Right, Both, Off.
Greg

I bought a Allen 6S122, used, for my Wag 2+2 project. Was told the valve had Left, Right, Both and Off. Should have done my research as it only has left, right off and off. I'd like to think I could drill a the shunt valve rather than getting a different valve. Is that doable with the 6S122? Thanks, Peter.

I have on a univar style, but have heard that you shouldn't because it creates a non anodized(hard) passage in the aluminum, that might be more apt to corrosion..... ..?.....

[supercub24a]

Just got done installing per there drawings all the fuel lines and fuel valve.
not bad just took a while to get the right forward fuel line to fit right.
I think the loss of that fuel in front and behind you will be a added safety benefit. Also looking forward to the both option on the selector. Only down side was I think the STC was a little on the pricey side.

I have put in a couple of cub crafters headerless systems and i think they would be just as bad during a wreck for dumping fuel out. unless they have changed things ? (1) the fuel line is closer to the firewall? (2) the instructions i remember had a beaded connection up on the firewall with two hose clamps? So for me go atlee's header tanks at least it gives me a good 8 inches for the firewall to come back before it gets into the fuel system.
Steve C

[MainlandCub]

I have put in a couple of cub crafters headerless systems and i think they would be just as bad during a wreck for dumping fuel out. unless they have changed things ? (1) the fuel line is closer to the firewall? (2) the instructions i remember had a beaded connection up on the firewall with two hose clamps? So for me go atlee's header tanks at least it gives me a good 8 inches for the firewall to come back before it gets into the fuel system.
Steve C

The headerless system was debated in entertaining fashion years ago on this forum and the anti-headerless system brigade felt that ringing the cabin with extra fuel lines was worse than having header tanks.

Andrew.

[Steve Pierce]

The Allen valve which I believe is the same as the Univair valve is not drillable in my experience. The o'ring is in the nylon shaft that turns and has a special groove machined in it around the radious of the shaft to house that o'ring. Dakota Cub has a nice valve that you don't have to install the two AN bolts for stops so you only go to off in one direction. DC has that built into the valve. Univair and Spruce sells the Allen valve with off-l-r-both but it cost as much as the Dakota Cub valve. http://www.aircraftspruce.com/catalo...s/allenfsv.php