[VAC] is it a crack in the black water tank?

["Russ Welch" <russcarriewelch@xxxxxxxxxxxxxx>]

Okay, now for the other trailer !  One trailer smells like onions, the other
trailer smells like holding tank.  Does that mean there is a crack in the
holding tank ?  How do I figure this out ?  Please send hints !

Thanks,
Carrie Welch
WBCCI#8344,VAC
1971 Safari
1974 Argosy