Document Ref 942005-001 Rev 2 Page 4-5
Component Technical Manual TQP-HS for Fuel Dispensers
2) Check the condition of the pump filter.
3) If the dispenser is the only one delivering this product, check the complete line from the
storage tank to the dispenser, noting the distance between the pump and the storage tank,
the height of the product in the tank and the various accessories (plugs, valves etc.). It
may be possible to solve the problem by filling the tank before trying to cool down the fuel.
4.7 Air Entry on the pipework to the Storage Tank
Check if there is a leak in the fuel line from the storage tank to the dispenser.
In pipework systems with more than one pumping unit per suction line, check the non-
return valves on each derivation (where fitted).
If there are no special valves for this purpose, the valves of the filter box take over this
function (they must be present on all dispensers). It is possible that one of these valves is
not closing properly and is allowing air into the pipeline. When the problem cannot be
found, a sight glass can be mounted underneath the pump filter box to check for leakages
and to define the leakage (contact Tokheim Hydraulic Department for further advice).
A defective foot valve can be detected by delivering about 20 litres with each pump and
observing if the delivery is immediately starting when the motor starts and stays constant.
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