Actually Ray what Jetmech05 has said is quite accurate. The size of the tank has a direct effect on the headpressure coming out of that tank dispite the pressure from the muffler.

Take a one gallon pail and poke a hole in the bottom side and do the same to fifty gallon drum and measure the pressure at these holes, I beleve you will detect quite a difference. That is head pressure and it will change dramatically from a full bucket to an empty one and this is one of many varibles in our fuel system beyond just muffler pressure that must be delt with.

Its a fact that grossly oversized tanks very often can present running problems and its a fact that newbies that tend to cram grossly oversized tanks into their airplane will very often have running problems or at the least never able to utilize the full capacity before the engine stops.

This is most certainly not to say that one cannot do it but it a very poor practice to suggest such to new folks as it often presents problems.


John