If they are coming off, they are likely either the wrong size or
shot.   The common failure of the OEM fabric covered hoses is for them
to start weeping after several years.  It's probably gotten worse with
the newer diesel fuel.    I've never had a problem with them actually
popping off though.   I took one of mine to the local auto parts store
and got a synthetic replacemnt that is fuel rated.  It's more like a
vinyl hose, think it's Viton and certainly cheaper than the MB
hose.    But if you choose to go that route, make sure it is fuel
rated.   Changed mine about 5 years ago and no more weeping.