[jclark003]

My mistake I thought you were referrring to a vac leak on the pumpout hose. Sans Peur is correct in that the hose between the pump/vac tank and the head is what needs to hold vaccum unless your are having the waste tank pumped out. Find the pump and work backwards to the head. They usually aren't too far apart. last time I changed them there were a couple of bulkhead clamps and that was it. Pulled the hose thru using a double ended hose barb as capt george suggested.

sometimes you can hear a vac leak if you can get close enough. The vacuflush /sealand manual has a set of troubleshooting tips that may help.

Either way you are probably on the right track to replace hoses. If some are cracked they are also most likely permeated and releasing odor.

Good luck