How to test your vacuum pump... To test your pump's ultimate vacuum, you'll need a properly working vacuum gauge, fresh pump oil and you'll also need to keep the gas ballast closed. Attach the micron gauge to the 1/4" port of the pump and turn the pump on. It should reach the pump's rated ultimate vacuum. If it doesn't, the pump could be defective. If it reaches ultimate vacuum but can't pull down a system, then most likely there's a leak in your hoses, manifold gauge or core tool. Pump and micr
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