Removing quick connectors from fuel line

Hello, everyone.

First, I'm not asking a question about removing quick connector-type fittings from the component they're attached to. My question is about removing the connectors from the line they're attached to.

I was trying to replace the fuel filter from a friend's car. It was very old and rusted, and did not want to come off. In the process, I damaged two of the three connector fittings. All of these fittings are connected to rubber fuel lines which are all in very good shape.

So, what I had hoped to do was to pull the quick connect fittings (which are plastic) from the rubber fuel lines, and replace just the quick connect fittings. (There are parts made by a company called Dorman which fit the bill. See the attached picture for an example.)

I can't find anything searching the internet about this. (I keep getting more info about disconnecting the line from the filter with the special tool.)

Has anyone used these connectors on the original rubber fuel lines? If so, were you successful?
Does anyone have any advice about pulling the broken quick-connect fittings from the rubber fuel lines? (I'd like to leave them attached to the car, if possible.)

Please help. I don't want to damage this car any further.
Thanks.

The picture of the Dorman product didn't come through. Have you tried searching the net for the Dorman part number? You might get results from folks that used the product and their review of the process.

-Rod