How to properly maintain the fuel delivery system: a complete guide

Summary

Regularly inspect tank, lines, connections, and fuel cap for leaks and damage
Replace air filter at 20,000 km and fuel filter at 20–30,000 km
Check fuel pump at 100,000 km: pressure, current draw, noises, wiring
Ensure electrical supply and calibrate MAF and TPS sensors, and check fuel regulator

Maintaining the fuel delivery system is essential for engine reliability and performance. A properly maintained fuel system not only enhances engine efficiency but also helps prevent costly failures over time.

Neglecting fuel system maintenance can lead to serious problems such as injector clogging, fuel pump wear, or even engine damage. Following a preventive maintenance schedule is essential for any vehicle owner.

Tank and fuel line checks

Visual inspection of the tank for signs of corrosion or damage
Inspection of the lines for cracks, deformations, or signs of material aging
Checking the tightness of all connections and fittings
Testing the fuel cap to ensure a proper seal

Filter maintenance

Air filter

The air filter plays a crucial role in proper engine operation and should be replaced at 20,000 km. A clogged air filter can cause:

Increased fuel consumption
Reduced engine power
Higher emissions
Premature wear of engine components

Fuel filter

The fuel filter requires replacement at 20,000–30,000 km, depending on the quality of the fuel used and operating conditions. This filter:

Removes impurities from fuel
Protects injectors from blockages
Maintains correct pressure in the system
Prevents corrosion of components

Fuel pump check

The fuel pump should be checked every 100,000 km. This check includes:

Testing the pressure generated by the pump
Checking electrical current draw to detect signs of wear
Listening for abnormal noises that may indicate mechanical issues
Inspecting electrical connections and wiring

A faulty pump can cause starting problems, power loss or even engine stalling while driving.

Electrical and electronic checks

Electrical power supply

The modern injection system relies on a stable electrical supply. Check:

Fuel system maintenance: a complete guide

Fuel system is one of the vital components of any internal combustion engine. The performance and condition of this syst...

Battery condition and terminal voltage
Alternator and charging capacity
Fuses dedicated to the injection system
Wiring for weak or corroded connections

Sensors and actuators

Electronic components require special attention:

Mass air flow sensor should be calibrated for precise measurements
Throttle position sensor requires periodic calibration
The fuel pressure regulator must be checked and adjusted to the manufacturer’s specifications

Fuel system leak testing

Fuel circuit tightness is crucial for:

Safety – preventing fuel leaks
Performance – maintaining correct pressure
Environmental protection – avoiding pollution
Economy – reducing fuel losses

Regularly check all fittings, lines and components for signs of leaks or deterioration.

Recommendations for efficient maintenance

Using high-quality fuel

Refuel at reputable gas stations
Avoid old or contaminated fuel
Use additives to help clean the system when necessary

Performance monitoring

Watch for any changes in fuel consumption
Pay attention to engine starting
Monitor exhaust emissions

Preventive maintenance

Follow the recommended service intervals
Do not delay replacing filters
Perform regular checks at specialized service centers

By following these recommendations, you will ensure the optimal operation of the fuel delivery system and prevent costly failures. Proper maintenance not only extends component life but also helps reduce fuel consumption and emissions.