7.15.3 Pump capacity – Check
WARNING
Fuels are combustible and explosive.
Risk of fire and explosion!
• Avoid open flames, electrical sparks and ignition sources.
• Do not smoke.
• Wear protective clothing, protective gloves, and safety glasses / facial protection.
Checking pump capacity
1.
Install suitable pressure gage in the intake connection of the pump.
2.
Check pump pressure.
a) Switch on fuel treatment system (optional).
Note:
The pressure limiting valve at the pump might respond and open. Audible noise is caused by overflow-
ing fuel and can be disregarded.
b) Close ball valve at the outlet of the fuel treatment system.
c) Check pressure at the pressure gage in the inlet to the fuel treatment system and note down.
3.
Checking pump pressure in throttled condition.
a) Reduce suction pressure of pump to -0.8 bar with the shut-off valve at the pump intake side.
b) Check pressure at the pressure gage in the inlet to the fuel treatment system and note down.
c) Open ball valve at inlet and outlet of fuel treatment system.
4.
Calculate wear limit.
Example:
Measured value (normal condition).
3 bar
Measured value (throttled).
2.6 bar
If the determined pressure (throttled) is undershot by the determined pressure (normal) by 10%, the wear
limit is reached. Repair pump (inform Service).
142 | Task Description | MS150118/01E 2015-05
TIM-ID: 0000054750 - 002
