West Virginia inspectors can't figure out the source of a white, powdery substance some service dealerships found clogging cars' fuel filters, causing the vehicles to stall. Inspectors visited about 20 service stations north of Wheeling last week, but didn't find any contamination. The dealerships say most of their customers live in Ohio. So far, at least 24 vehicles reportedly have been damaged by the substance. Dennis Harrison coordinates fuel quality testing in West Virginia. He says investigators are having trouble tracking the fuel to its source, especially if that source is out of state. He says that's because Ohio and Pennsylvania are two of only four states in the nation that have no fuel quality laws. The others are Nebraska and Alaska.