WASHINGTON — Representative Don Young and his family routinely used campaign funds for personal expenses, like hunting trips, meals and charter flights to his home in Alaska, a former campaign aide to Mr. Young told federal criminal investigators.

The allegations came to light Friday when the Federal Bureau of Investigation released hundreds of pages of documents from a now-closed investigation into Mr. Young’s role in 2005 in helping steer $10 million to a road project in Florida favored by a campaign supporter.

The investigators ultimately concluded that there was insufficient evidence to charge Mr. Young with wrongdoing in connection with the budget earmark for a highway interchange in Florida that would have benefited a Michigan real estate developer who was a major political donor to Mr. Young, a Republican who has represented Alaska in Congress since 1973.

While gathering evidence in this case, federal investigators examined many other aspects of Mr. Young’s professional and political life, including allegations that he and his wife, Lu Young, used campaign money to support their personal lifestyle.