The Complaint Was Not Consistent

A diesel vehicle used for regional work in Argentina developed an unusual power-loss complaint.

The engine could operate normally for a period, then suddenly lose power under acceleration. After the vehicle was stopped or the engine was switched off, normal performance sometimes returned.

The intermittent nature of the symptom made injector diagnosis difficult.

The Workshop Looked for a Shared Fuel-Supply Problem

Because all cylinders lost power together, the technicians inspected the low-pressure fuel path.

The filter did not initially show a restriction severe enough to explain the complaint.

Attention then moved farther upstream toward the fuel tank and pickup system.

Debris Was Moving Inside the Tank

Contamination inside the tank was able to move toward the pickup during operation.

Under higher fuel demand, the material partially restricted the inlet.

When the engine stopped, the debris moved away from the pickup and fuel supply temporarily returned to normal.

This explained why the complaint could disappear before the vehicle reached the workshop.

Why the Injectors Looked Weak

A restricted pickup reduces fuel available to the high-pressure system.

The driver may experience weak acceleration, low power, and unstable rail-pressure behavior.

These symptoms can resemble inadequate injector delivery even when the injectors themselves are functioning correctly.

The workshop cleaned the affected fuel-supply area and checked the filtration system before returning the vehicle to service.

Verification Under Load

The vehicle was then tested through the same acceleration and sustained-load conditions that had previously produced the complaint.

Fuel supply remained stable and the intermittent power loss did not return.

Case Conclusion

This Argentina case shows why intermittent power loss should include inspection of the fuel tank and pickup system.

A moving restriction can create injector-like symptoms while leaving little evidence during a stationary workshop test.

Following the fuel path from the tank forward prevented unnecessary injector replacement.