Over time, the barrel and plunger can experience wear due to fuel contamination, poor lubrication, or long-term operation under heavy loads. Common problems include pressure loss, uneven fuel delivery, and hard engine starting.
When the plunger or barrel surface becomes worn, fuel can leak past the precision fit, resulting in reduced injection pressure and incomplete combustion. In severe cases, this may cause black smoke, knocking, or poor acceleration.
To prevent these issues, always use clean, high-quality diesel fuel, replace fuel filters regularly, and follow the manufacturer’s maintenance schedule. Early inspection can help avoid costly fuel system repairs and downtime.