Just saw your reply at 14:00, yes the return lines are push fit.

However, you do need to be gentle with the removal. It is possible to be too rough getting them off and crack the fitting. Or if you are tempted to score the hose to remove it, that can put a scratch on the fitting that creates a leak. Best to grip the hose with a pair of needle nose pliers (put some electrical tape on the jaws so that there is no chance of scratching the fitting) then grip the hose and twist back and forth to break the bond.

__________________
The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech