My Saito 100 was working ok but when high Gs involved, the engine was struggling a bit. A pump would solve the problem but instead I tried this :

I connected the breather line directly to the tank vent line. The result generated too much pressure that I can not regulate by leaning the needle. Then I put a small brass tube between the breather and vent connection I made ( see attachment ), and made a tiny hole in this tube in order to relieve excess pressure.

I have to say that it worked like a charm. Now whatever I do, engine works like a clock, and there is no richening in the midrange. The pressure generated by this setup is more than muffler generated pressure. High speed needle needs to be leaned a bit, low speed mixture is not affected by this setup.

I used a 1/8" brass tube with a hole diameter of about 1 milimeter. You can enlarge the hole if there is still excess pressure.

The advantage of this over a pump is it is cheaper, simpler and it is easy to operate.

I think anyone who has fule draw problem in an engine may use it.

I would like o hear about our comments.

Thanks.