might want to check the local fire codes. fire marshalls some times have a problem with electrical motors near petrol. 514.3(b)(1) may say O.K. but the fire marshall may have a problem with it. Saftey first. A vacuum cleaner can create a static spark and thats all that is needed to ignite petrol. As far as I know the fire marshall would have the last say in an instalation of that type.