A fire-damaged car belonging to a missing elderly camper has been found in Gippsland and police are appealing for public help to find the man and his companion.

Russell Hill, 74, has not been heard from since March 20 while 73-year-old Carol Clay, who is believed to be with Mr Hill, has not returned home.

Russell Hill and Carol Clay have been missing for more than a week.

Mr Hill, from Drouin, left on March 19 to visit campsites along the Dargo River about four hours north-east of Melbourne.

His last check-in came from Wonnangatta Station in the Victorian Alps. His car was found on March 27 with signs of minor fire damage near the Dry River Creek track at Billabong.