I got this to try to change out a fuel filter on a 03 F150.  It's very nice that it has a bunch of different sizes, but there's nothing to grab onto.  Once you slip it over the fuel line there's only the little larger piece of plastic to grab, and I was not about to generate enough force to pop off the back fuel line.  I also found that the harder I pushed the more the tool sort of opened up.  If you could get your fingers directly behind the wide end of this tool you could really generate a lot of force and probably pop the fuel line off easily.  The way it's set up, though, you can't.

While it's more expensive, I think the larger aluminum one-size tools seem like the way to go.  There you actually have something to hold onto.  I should add, though, that I have a feeling my fuel line is a bit rusted / gummed up and so perhaps under normal conditions this tool might work without a huge amount of effort.  Pushing as hard as I could, though, I was not able to get the fuel line off with this tool.
I got this to try to change out a fuel filter on a 03 F150. It's very nice that it has a bunch of different sizes, but there's nothing to grab onto. Once you slip it over the fuel line there's only the little larger piece of plastic to grab, and I was not about to generate enough force to pop off the back fuel line. I also found that the harder I pushed the more the tool sort of opened up. If you could get your fingers directly behind the wide end of this tool you could really generate a lot of force and probably pop the fuel line off easily. The way it's set up, though, you can't. While it's more expensive, I think the larger aluminum one-size tools seem like the way to go. There you actually have something to hold onto. I should add, though, that I have a feeling my fuel line is a bit rusted / gummed up and so perhaps under normal conditions this tool might work without a huge amount of effort. Pushing as hard as I could, though, I was not able to get the fuel line off with this tool.