William H. Houpt, 46, a resident of Severna Park who was president of the Heil Equipment Co. in Forestville, died Sunday at the shock-tramma unit of University Hospital in Baltimore from injuries he received in a traffic accident on Saturday.

Maryland State Police said that Mr. Houpt was a passenger in a car driven by Bert C. Currin, also of Severna Park. The car was southbound on the Jones Falls Expressway near Baltimore when it struck a guard rail and bridge.

Currin was taken to Sinai Hospital in Baltimore where a spokesman said he was in fair condition.

Mr. Houpt was a native of Bedford, Ind., and a 1958 graduate of Purdue University. After working in the sales division of International Harvester Co. in Chicago, he transferred to that company's Baltimore office in 1968.

He worked for International Harvester until purchasing Heil Equipment, a heavy road machinery leasing and sales company, in 1977. He was president of Heil at the time of his death.

He was a member of the Chesapeake Bord of the Amateur Softball Association of Annapolis and was a member of the Chartwell Golf and Country Club in Severna Park.

Mr. Houpt was a member of the administrative board of the Severna Park United Methodist Church.

Survivors include his wife, the former Dorothy Monk, and two daughters, Cindi and Diana, all of West Severna Park; and his parents, Mr. and Mrs. cWilliam Houpt, and a sister, Shirley Henderson, all of Bedford, Ind.