A 400-pound former national champion sumo wrestler who completed the Los Angeles Marathon in torrential rain may have set a Guinness record, race officials say.

Kelly Gneiting, 40, jogged and walked his way through driving rain to finish Sunday's 26.2-mile marathon in 9 hours, 48 minutes, 52 seconds, the Los Angeles Times reported.

"I did it, but it was hell," Gneiting said shortly after crossing the finish line in Santa Monica. "Pure hell."

Gneiting -- who weighs 400 pounds and has a 60-inch waist -- said he thought more than once during the race his blistered, rain-soaked feet would prevent him from finishing the course.

"My feet were on fire," he said. "Twice, blisters popped and just about brought me to my knees -- but I kept going."

Aside from completing the marathon, Gneiting succeeded in accomplishing a personal best, improving his time from 11 hours, 48 minutes, 16 seconds from the 2008 Los Angeles Marathon, the Times said.

Gneiting may also have set a Guinness world record for the heaviest person to complete a marathon. That decision will be made after Guinness representatives review his results.