2002 Vue fuel filter connectors

The last item of my 100,000 mile maintanence schedule is replacing the
fuel filter. I got a new one from the dealer and started the change.
The outlet line came off with no problems, but I can't seem to find
how the two inlet lines lines are secured to the old filter. There's
a little plastic tab that unsnaps and folds out of the way, but
something else is still holding the fitting on. I tried a removal
tool (a plastic collar) that I've used to release lines from other
types of filters, but that didn't seem to work. Does anyone know the
secret to disconnecting these fittings? Thanks for any advice.