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my Glow-worm fuelsaver mk2 fires up knocks badly and then closes down what do?

my Glow-worm fuel saver mk 2 knocks badly and then closes down what the problem
jim, June 2012
you should have mentioned boiler knocking badly after new pump fitted
nevermind
check pump valves are open
check power to pump
check system bled & vented

AWOL, June 2012
thats what we thought and fitted a new pump

jim, June 2012
defective pump

AWOL, June 2012
link Click here to see other fixes for Glow-Worm.