Tokheim TQP-HS - Uneven Fuel Flow Diagnosis

TQP-HS for Fuel Dispensers Component Technical Manual
Page 3-6 Document Ref 942005-001 Rev 2
3.2.3 UNEVEN FUEL FLOW
YES
YES
NO
Find air entry
(refer to section 4.7)
Air entry in the
Pas itself (refer to
section 4.4)
NO
YES
YES
Malfunctioning
upstream of PAS. Check
electro-valve etc.
NO
NO
Fuel is too hot
Cavitation mode
UNEVEN (PULSING)
FUEL FLOW
Outlet pressure
>1.5 bar? (refer
to section 4.1)
Is pressure
constant after
outlet valve?
Is the air
separator
working? (refer
to section 4.3)
Is there air
entry on the
fuel supply
line?