Document Ref 942005-001 Rev 2
Page 3-3
Component Technical Manual
TQP-HS for Fuel Dispensers
3.1
Failure Diagnosis
Prior to performing fault diagnosis/search, check the condition of the belt drives.
Following any repair action to the pumping unit, ensure that all the necessary procedures
required by Weights & Measures and applicable safety legislation are correctly followed.
NOTE : Once an O-ring has been removed, it must not be re-used.
Check the normal operation of the pumping unit for one or more of the following problems:-
•
No fuel flow (refer to section 3.2.1)
•
Reduced fuel flow (refer to section 3.2.2)
•
Uneven (pulsing) fuel flow (refer to section 3.2.3)
•
Closing of the overflow valve (refer to section 3.2.4)
•
Excessive noise (refer to section 3.2.5)
