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building aa doodle bug using 29 cowl gas tank is bad have a new round tank ,it is 8 1/2 inches tall 32 1/2 long ,trying to figure where to put it top of cowl might be only choice any pic of external tanks

How about behind the seat with an electric fuel pump?

Bob

If you use an electric pump, don't forget a pressure regulator(about 2lbs+or- so you don't overload the carb) & a fuel shut-off.

Many have used a Model T style tank mounted lengthwise above the engine. You can use a saws-all to cut out the lower part of the A tank, and fit your tank up underneath the cowl top. You may also find that a 3 gallon boat tank will fit easily. On the back with regulated fuel pump is a better choice.

I would vote for putting it inside the old tank. Cut the bottom out of the old one and put it up inside. That way much of the old stuff could still be used.

And in 20 yrs. the grand kids will have a good start on restoring the whole thing back to original.

KVO