DETROIT (AP) — Federal safety regulators are investigating older BMW R-Series motorcycles for gasoline leaks that could cause fires.

The probe affects about 24,000 motorcycles from the 2005 through 2008 model years sold in the U.S.

The National Highway Traffic Safety Administration says the housing around the fuel pump can crack and leak gasoline. No fires or injuries have been reported, but the safety agency has received 28 complaints from owners of the bikes. At least two owners say that gas soaked their pant legs.

Investigators will check into how often the leaks happen and determine if a recall is necessary.