http://www.webra-austria.at/download/en/motor.pdf
Scroll down to the DynaMix carb and item 5 says the DynaMix carb will operate with muffler pressure or a pump, just like any other engine. For anybody with Webra engines tht page is well worth printing. Nobody caught it but the Webra .50 running as a Diesel is wearing an MVVS 7mm carb.