Pony Tank setup

For instance I am putting together a ducted fan. I am putting a small 3 oz tank just a couple of inches fro the engine so the engine can have a reserve I also have two eight oz wing tanks on each side of the fuse, which are the main tanks.

The mains feed the "pony tank" or "feeder tank" so I do not have to push fuel a great distance to the engine from the beginning.

In some planes with retracts you put two tanks in one close to the engine and another behind it. (most cases on the CG) so you can carry more fuel.

A friend of mine has a Sig Kougar with retracts and runs two eight ounce tanks feeding his ASP 61. Because space is a premium inside the fuse.

The vent line of the "feeder" goes to the fuel line of the main tank and the pressure line of the second tank goes to muffler or tuned pipe for pressure. This pushes fuel out of the second tank into the "feeder". Very easy to do and you can increase your fuel capacity without using a larger tank.

Hope that helps.