Troubleshooting Diesel Engine High Fuel Consumption

High fuel consumption is usually caused by the dirty components that contribute to the combustion cycle because deposits form in the fuel or injection system. The soot produced during combustion is often deposited on the injection nozzles, piston rings and valves.

For example, dirty fuel injector in a diesel engine can cause more consumption of fuel than usual. Your engine may function normally for a while but the fuel won’t be burnt efficiently. As you can tell from the image below, the spray of fuel from injector is not even.

Dirty injector produces bad spray pattern
Clogged fuel injector

On the other hand, a clean injector will produce good spray pattern which ensure best possible fuel combustion. This will ensure better fuel economy (aka fuel-efficient or better gas mileage).

Clean fuel injector


Our solution is to clean the fuel system periodically. With LIQUI MOLY, it's really easy to begin the treatment. Just pour into fuel tank and drive your car.


Diesel Purge

Removes deposits on injection nozzles and in the combustion chamber. Increases the cetane number. Eliminates engine operation problems such as knocking in idle and provides round and quiet engine running. Protects the entire fuel system from corrosion. Optimizes the emission test values. Can also be used as a preventative measure. Clean engines need less fuel and reduce emissions.


Common Rail Additive

Maintains and protects the entire fuel system from wear, deposits and corrosion. Improves engine running and prevents performance decrease. Increases the lubricity of diesel fuels. Clean engines need less fuel and reduce emissions.


Diesel Filter Additive

Cleans the fuel system and injectors in high concentrations. Makes the engine easier to start and quieter to run. Protects the entire fuel system against corrosion and improves the lubrication properties of the fuel. For improved fuel atomization due to cleaner nozzles. This saves fuel, ensures better combustion and reduces the risk of damage.


Super Diesel Additive

Removes deposits in the diesel injection system and in the combustion chamber and prevents new deposits. Maintains all components of the diesel injection system. Prevents any seizing up and gumming up of nozzle needles. Boosts the cetane number, improves the ignition performance of the diesel fuel and ensures smooth engine running. Protects the entire fuel system against corrosion and wear. Optimizes the emission test values and the performance of the engine. Clean engines use less fuel and reduce the pollutant emissions.

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Other possible reasons:

  1. Clogged diesel particulate filter (DPF) due to accumulated ash and soot.
  2. Clogged air filter.
  3. Wrong engine oil viscosity.

- More to be added in future -