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The owner of the 24-foot motor home had packed it with his belongings to move from one house to another, according to Battalion Chief Peter Lawrence of the Oceanside Fire Department.

While headed to his new home, the motor home stalled at the intersection of Douglas Drive and North River Road, Lawrence said.

Another man tried to get it started by pouring gasoline into the carburetor. The vapors ignited, burning him and igniting the engine compartment, Lawrence said.

The motor home's owner tried to put out the fire, while the burned man ran back to his house, Lawrence said.

Arriving fire crews were confronted with heavy fire conditions along with exploding ammunition, propane tanks and tires. Shell casings from small caliber ammunition bounced off fire engines, but no one was injured, Lawrence said.

Firefighters had the blaze under control within 30 minutes and out in about an hour, Lawrence said.

While firefighters were working to get the motor home fire under control, another emergency call came in from a residence in the 4400 block of Arbor Cove Circle, about half a mile away, stating a man was burned and needed assistance, Lawrence said. The man, who was in his 50s, sustained serious burns and was air lifted to the burn unit at UCSD Medical Center in San Diego, Lawrence said.

The motor home was declared a complete loss and about 75 percent of the belongings inside were destroyed as well, Lawrence said. A skip loader and a dump truck were called in to move the burned debris, he said.

The destroyed motor home was valued at $5,000 and its contents at $10,000, Lawrence said.