Assuming this will be fine for as unoften as I'll use it?Depending on if you have the electrical or mechanical pump, basically hook a vacuum gauge to it.
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Fuel Pump and Vacuum Tester
Amazing deals on this Fuel Pump /Vacuum Tester at Harbor Freight. Quality tools & low prices.
www.harborfreight.com
I've never actually used one before, but they seem pretty self-explanatory?