Perhaps the people that told you that you were getting one engine, when in fact you got another, and that you've given such implicit trust, ARE the reason you've had trouble with the engine. You'll find hundreds of people here that get 10+ gallons of fuel from the Orion engines and others that come from the same facility. If you only got one gallon, there's a slight chance that something went wrong, but it's more likely that someone involved in the process of breaking in and tuning this engine, caused its demise.