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It looks like you are right Mike. I was able to get the parts manuals side by side from the Cessna flight center/repair station here at X39. Boy my heart sank to learn the parts and part numbers are different. (and the diagrams most noticeably show the two fuel lines).

Fred - Some 152 flyer is going to be lucky to pick these up.

Our plan is to effectively create an OEM Aerobat wing with long range tanks. We'll keep working in that direction.

I really don't think the needed mods are a deal killer, if somebody wanted to install these on a 150. The headliner will be out and the wings already off, so all it takes is punching four holes in the fuselage "rib" (to match the 152's fuel pickups) and installing a few pieces of the 152's plumbing. Certainly MUCH easier than modifying standard tanks in a 150's wing, plus you'll have less "unuseable" fuel... a plus in a tailwheel airplane. Since the 150 and 152 are on the same TCDS, this could be approved as an "upgrade".

Can't you just cap the extra fuel lines that the 150 doesn't need?

The 152 fuel lines use pretty much the same routing and clamps as the 150. There's just more fittings and lines at the tank connections. The old 150 lines would be in the way, and why leave even that small amount of weight in the plane?

DANG! The one thing I forgot is a biggy! The 152 wings only provide for 30° of flap travel. That can be modified too by changing the flap tracks, bellcrank, actuator, and some linkage... but the job just got that much bigger.

That's what I was thinking.

I wouldn't call it a deal breaker and I like the idea of capping the forward drain point if you can get an inspector to buy off on it. I guess the only trouble would be fuel starvation in a low tank steep decent. As for running the added forward fuel lines, good luck with that. It runs inside of the door post. Without one to pattern it is very difficult, or it was for me, to make one. Plus, you will be cutting large holes in your post so you need to get that right. As for making Aerobat LR tank set up, they are just like the 152 tanks with the double drains. They do have additional sheeting sitting under the tanks. I think to beef up this area.

Mike