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[title] Fixing The Pump Plunger (Piston)
-[* black] The problem is that the plastic pump plunger/piston binds and sticks. To unstick it use 120 grit sandpaper and EVENLY sand the circumference of the plunger head then the 2 ribs below it. Test. Repeat until there is better movement but NO loss of suction. When you are satisfied put a small amount of petrolium jelly around the head and ribs. Test.
+[* black] The problem is that the plastic pump plunger/piston sticks in the cylinder. Use 120 grit sandpaper and EVENLY sand the circumference of the plunger head and the 2 ribs below it. Test. Repeat until there is better movement but NO loss of suction. When you are satisfied put a small amount of petrolium jelly around the head and ribs.