Had to go out and take a peep, in order to find out which Perry is on my Saito 1.80. Still don't know, 'cos the label has worn off, but I can tell you that it is the type which uses crankcase pressure as its motive power.

I have the engine mounted in a 1/4 scale Stampe. The fuel tank is way back in the fus, over the CG...that's about 12"-15" from the carby. HTH. For most of its life, this model has had a petrol engine. In fact, it flew >200 hours whilst fitted with a Zenoah 23. Believe it, or not, the Saito (with pump and on-board glow) is far more reliable, much more powerful and a heap more expensive to feed!