Motorcycle fuel filter - maintenance and advice

Fuel filter, the importance of periodic maintenance and replacement, to reduce consumption and extend the life of the engine.

Ducati V4 Granturismo engine
Ducati V4 Granturismo engine

The motorcycle fuel filter: useful information and advice, the importance of maintenance and periodic replacement.

The motorbike's fuel filter performs the function of retaining particles and external impurities which, entering the circulation, could affect the functionality of the engine, in some cases causing serious damage.

Through its filtering action, this component therefore contributes to optimizing vehicle performance, in particular by preserving the fuel system from premature damage. There are two types of petrol filters for motorcycle: filters for fuel engines and filters for injection engines. The former are generally found between the pipe that carries the petrol to the engine and the engine itself and are clearly visible by virtue of the metal clamps with which they are fixed, while the latter are mostly located under the body in the middle, near of the tank. Which is why the latter are also the most difficult to reach in the event of a breakdown. 

To better illustrate the characteristics of this part we can consider the specific case of fuel filter of the MAHLE line having the following technical specifications: height 100,0 mm; diameter 30,0mm; backset 8mm; output 8,1mm; packaging height 10,70 cm; packing length 4,0cm; net weight 15,0g. This filter fits a large number of motorcycle models marche more widespread.

Like all motorcycle parts, the filter can also malfunction. Here are the most common signs of a defect:

  • Decreased power and performance.
  • Unusual increase in fuel consumption.
  • Sudden blocking of the engine.
  • Starting problems.
  • Fuel leak.
  • Late throttle response to commands.

These are instead the most common causes, from which a malfunction may depend:

  • Presence of impurities in the fuel.
  • Infiltration of dirty particles into the fuel system.
  • Incorrect installation.

Like all components, the motorcycle's fuel filter wears out after a certain period of time and must be changed. As a rule, the replacement should take place once the threshold of 5.000 km has been reached, however the manufacturers recommend changing it as soon as the filter shows signs of causing problems.

If you have good experience in the field of mechanics, the replacement can also be carried out in the home garage independently.

These are passivated to follow:

  1. Obtain a 5 mm male Allen key, a 10 mm female hexagonal key preferably T-shaped, a Torx measure H2o and a new fuel filter, of the brand recommended by the manufacturer or at least of a compatible model.
  2. Empty the tank by disconnecting the tube which leads the petrol to the filter, being careful not to change the original position of the tubes. The abbreviations M (delivery) and R (return) affixed to the clamps connected to the tubes will help in this regard.
  3. Remove the filter protection box.
  4. Remove the old filter.
  5. Repeat the operation in reverse, being careful to place all removed components back in their original positions and to securely tighten all fasteners.
  6. Fill the tank with new gasoline.

If, after installation, the bike starts without problems and there are no fuel leaks, this will be proof that the change was made correctly. During the replacement operation it is also advisable to check all the components connected to the filter, especially the tank. If traces of rust are found inside, an anti-rust treatment must be carried out immediately.