Well, the good news is that though Pump Manufacturing won't score you any dates, you can impress Admissions committees with it. The key is to show and pain the picture - you can be an applicant with the most interesting profile and thus quite unique. On the other hand, if you don't position it right, you may end up with neither.
bottom line - the brand matters but unless you are planning to change your profession to be employable by one of the companies you mentioned, you need to dig in, and try to make the most impact in your industry/company/etc. I am sure they take at least one guy from the Pump industry - you want to be that guy.
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