TQP-HS for Fuel Dispensers Component Technical Manual
Page 3-2 Document Ref 942005-001 Rev 2
3 FAILURE DIAGNOSIS
1) Before starting any maintenance procedure, ensure that the standard safety measures are taken:-
•Ensure that all necessary tools and replacement parts are available.
•Ensure the dispenser is isolated and all power is turned off.
•When working on or near a dispenser, always act in accordance with general safety rules and
regulations.
•Cordon off the dispenser under repair.
•Wear appropriate Personal Protective Clothing.
2) When the TQP-HS is stopped, ensure that the pumping unit is not pressurised due to the closing of
the vent float valve. If there is no air coming from the air vent when the filterbox cover is removed,
the vent float is closed and the pump is pressurised. Pressure can be released by unscrewing the
top vent plug (reference item [9] in the schematic diagram of operating principles), and pushing the
float down carefully with a screwdriver or pin.
Push Vent Float down
using screwdriver
to release pressure
Unscrew Vent Plug
Vent Plug
Vent Float
Air Vent
Filterbox Cover
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