Fuel System Checks; Fuel Contamination And Water Trap; Priming Pump Strainer Cleaning; Bleeding The Fuel System - KIRLOSKAR DV Series O & M Manual

6.5

Fuel system checks

Fill the tank with the recommended fuel. Keeping tanks full reduces water condensation and helps keep
fuel cool, which is important to engine performance. Make sure fuel supply valves (if used) are open.
To insure prompt starting and even running, the fuel system must be primed with the fuel feed pump
manually before starting the engine the first time, or after a fuel filter change. Refill at the end of each days
operation to prevent condensation from contaminating the fuel. Condensation formed in a partially filled
tank promotes the growth of microbial organisms that can clog fuel filters and restrict fuel flow.
If the engine is equipped with a fuel water separator, drain off any water that has accumulated. Water in
fuel can seriously affect engine performance and may cause engine damage. KOEL recommends installation
of a fuel water separator on generator units.
6.5.1

Fuel Contamination and water trap

In the generator environment, the most likely fuel contaminants are water and microbial growth (black
slime). Generally, this type of contamination is the result of poor fuel handling practices.
Black slime requires water in the fuel to form and grow, so the best prevention is to keep water content to
a minimum in storage tanks.
If diesel fuel which contains moisture is used the injection system and the cylinder liners / pistons will be
damaged. This can be prevented to same extent by filling the tank as soon as the engine is switched off
while the fuel tank is still warm (formation of condensation is prevented). Drain moisture from storage
tanks regularly. Drain the water from water seperator by loosing plug after every 50 Hoursof the fuel filter is
also advisable.
Notice : A galvanized steel tank should never be used for fuel storage, because the fuel oil reacts chemically
with the zinc coating to form powdery flakes which can quickly clog the fuel filters and damage the fuel
pump and injection nozzles.
6.5.2

Priming pump strainer cleaning

Clean the priming pump strainer every 250 operation hours.
The strainer is incorporated in the priming pump inlet side joint bolt.
Clean the strainer with the compressed air and rinse it in the fuel oil.
6.5.3

Bleeding the fuel system

After the cleaning of the fuel filter or after the engine stop by the lack of fuel, the bleeding of the fuel system
must be executed by all means. Bleed the system by manually operating the priming pump with fuel filter
outlet joint bolt and injection pump bleeder screw loosened.
• Press the feed pump cap repetitively until the fuel without bubbles comes out from the bleeding
valves.
• After the whole air is pulled out, close the valve of the filter.
• Confirm the resistance of fuel delivery by the repetition pressing of the feed pump cap, Pressure and
turn the feed pump cap simultaneously to close it.
• A separate bleed screw has been provided for bleeding of air.
74
Feed
Pump