Begin under the hood of the car, on the driver's side, back near the large round brake booster. You will see a yellow check valve with two connections coming from it. One connection is a 3-way "Y" connection with two yellow lines coming out of it. This is the feed for the vacuum door lock system.
Pull all three lines from the check valve and test it. Use your mouth to suck and blow in to the single connection side of the check valve. If you can suck AND blow, the valve is bad and will need to be replaced. If air will only travel one way, the valve is OK.
Connect your hand vacuum gauge to the yellow line with the grey stripe. Use your pump to pull a vacuum of about 10 to 15Hg in the tank. It will take a LOT of pumping but it's worth it to know if your tank is leaking. When you've pulled that vacuum walk away for about 5 minutes to see if it holds. Vacuum tank is pictured, in trunk, under hat shelf.
Move your vacuum pump to the yellow solid line with no stripes for the next step.
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