Ralph,

I'm using a Perry VP-30 (blue case) pump with a Tee fitting(see pic) right at the carb. The carb is the standard OS 5B carb designed for the OS Max 50 FSR, nothing special.

Since this is a vintage engine I decided not to try and run it with just muffler pressure as I didn't want to have to worry about a lean run at least from relying on the vacuum from the engine. I also add 4oz of castor to the glow fuel I'm using and also run it as rich as I can.

I'm not using the check valve on the tank vent and it is vented to the air, no muffler pressure.

I have positive fuel pressure to the carb during all manuvers and only had one deadstick so far due to a small piece of what appeared to be aluminum that got wedged in the glow plug. over 50 flights on the Utter Chaos now and it's turning 14400 rich, very nice vapor trail behind the plane while flying.