It is a fair bet that your vacuum line to your petcock is off. The petcock on the 454 has a diaphragm pump in it to pump fuel and those are known to go bad.
Also, if you do not have both air filters installed it will refuse to start.
If neither of those work, IM me and I'll dig up the link to a site that specializes in them. "Great White Knight EN450" may turn it up if you do a web search. TargetDriver
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