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how do you prime the pump?

how do you prime the pump
c r lake, April 2012
most heating pumps have a bleed screw that can be loosened to vent air [prime the pump]
some more modern pumps have a pump autoairvent fitted which just requires ensuring dust cap is NOT fully tightened but IS left loose

manwithnoname, April 2012
Oil pump petrol pump water pump air pump whatsa myjig pump cycle pump tyre pump pump pump

SD, April 2012