Safety first: Ensure good ventilation and keep ignition sources away. Diesel vapors are flammable.

Inspect all joints: Check around the fuel filters, injection pump, and tank connections for dampness or staining.
Check tank vent: Ensure the fuel tank vent is routed correctly and not blocked, which can force vapors into the enclosure.
Clean spills: Use absorbent pads to clean any old spills inside the base frame or around the fill point.
Monitor over time: After tightening and cleaning, recheck after a test run to confirm the smell has reduced.

Strong diesel smell around generator even when not running

Possible Causes