WHOA THERE!
Do you really want to ask a bunch of (most of us anyway) crazy home experimenters about mixing flammable liquids under pressure and electricity? I, for one, wouldn't even consider answering such a question.
I would check out the major pump manufacture’s web sites and follow up with questions to their local reps.
And, when using flammable materials that can generate explosive vapors it's the wrong time to be seeking the lowest price. What you want is equipment that will get the job done and keep you alive.
Think of visiting one of your fellow students in the hospital and trying to figure out how to justify to them that you saved a few hundred dollars on a pump that caused their injury.
"Well, I didn't think it would...."
And, I'd make sure your supervisors don't find out that you would seek advice on such a question in an unorthodox place such as this.
Your asking such a question shows dedication and ambition, where you are asking shows cause for doubting your ability to think clearly.
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