Updated

A fun weekend of racing for Dale Earnhardt Jr. (search) turned frightening Sunday when a wreck during a warmup for an American Le Mans Series (search) race turned his car into a fireball, leaving him hospitalized with burns on his face and legs.

Earnhardt's injuries were "moderate-sized burns of moderate intensity," according to medical officials at Infineon Raceway in Sonoma, Calif. The ALMS said Earnhardt had second-degree burns (search) on the insides of both legs and on his chin.

The NASCAR (search) star, son of the late Dale Earnhardt (search), was flown to the University of California-Davis Medical Center in Sacramento, where he was expected to be kept overnight for observation. He will be examined again Monday.

"I'm bummed out and disappointed I couldn't run the race," Earnhardt said through a team spokesman.

Steve Crisp, a spokesman for Dale Earnhardt Inc., said Earnhardt was not badly injured. "They've done the X-rays and there's no bones broken," Crisp said. "He'll be fine."

Still, any crash involving Earnhardt always brings up memories of the last-lap wreck at the 2001 Daytona 500 that killed his father, easily the most popular driver of his era.

Crisp said the younger Earnhardt will compete in next weekend's Nextel Cup race at New Hampshire International Speedway. Earnhardt, second in the Cup standings behind Jimmie Johnson, was supposed to be enjoying a weekend off from his regular series for a rare chance to race without pressure.

"These folks are tough," Crisp said. "They bounce back from all kinds of things. He'll be OK. They wanted him to rest comfortably today and they'll send him out tomorrow."

The accident came at the start of the 30-minute morning practice. Earnhardt lost control of his Chevrolet Corvette C5-R, spun and slid backward into a concrete barrier in turn eight of the road racing track.

Officials said the crash broke the fuel filler neck, where the gas is poured into the car, briefly turning the Corvette into a fireball after it came to a stop in the middle of the track. Earnhardt quickly got out of the car on his own before being assisted by safety crews. The car continued to burn and was a total loss.

Earnhardt was to have driven in Sunday's ALMS race with veteran road racing driver Boris Said. The team withdrew the entry from the race after Earnhardt's crash.

Earnhardt has been hurt before in a race car. He sustained a concussion in a crash at California Speedway early in the 2002 season and hid it from NASCAR for five months, afraid it might keep him from racing.

It led to a poor season for Earnhardt and eventually to a new policy by NASCAR forcing drivers with head injuries to get medical clearance before returning to competition.

The younger Earnhardt was introduced to sports car racing in 2001 when he and Earnhardt Sr. co-drove a Corvette in the 24-hour race at Daytona.

Earlier this year, Earnhardt, fellow Cup star Tony Stewart and Britain's Andy Wallace combined to nearly win the endurance race at Daytona. Stewart was at the wheel of a Chevrolet-powered Crawford when a broken suspension piece nearly put him into the wall and cost the team victory just 20 minutes from the end.