Emergency services were called to the incident on Ben Boyd Road south of Eden around 1pm on Thursday, December 5.

Fire and Rescue NSW Eden station commander Zlatko Nemec said upon arrival the rig of the truck was engulfed in four-metre-high flames and the driver had moved to safety away from the vehicle.

The blaze was extinguished promptly by FRNSW Eden while attending fire crews from Eden, Merimbula, Kiah, Towamba Rural Fire Services and NSW Forestry Corporation fire crews worked quickly to contain fire that had spread into surrounding scrubland.

"It was a very narrow escape - there was 800 litres of diesel on board," Commander Nemec said.

"It was lucky the driver noticed when he did and called triple zero who responded quickly sending out the to call emergency services."

Police and Ambulance were also in attendance. There were no injuries.

Meanwhile, police are investigating a separate fire incident that took place on Brandy Creek Road, Nullica River north of Kiah on Saturday, December 7.

Commander Nemec said crews arrived to a scene of bush alight around 5.15pm.

"It is understood this was a deliberate act of arson by unknown persons," Commander Nemec said.

Forestry Corporation, Eden RFS and Eden Fire and Rescue were able to contain the fire quickly before it spread into further bush land.

It's understood the cause of the fire is being investigated by Eden Police.

Report all fires immediately to Triple-0 (000).