You have the standard hose end fittings Dave, you just need to push the tab correctly and wiggle the hose end. It will come off but they can be reluctant to move at times, there is no easy way.
If you want to replace the hoses and end fittings with some slightly easier quick release fittings look on eBay for "Bundy Type 7.89mm ID6" for the fittings and 7.3mm ID Ethanol proof fuel hose J30R9 73379 Type 3E, plus 11-13mm fuel hose clips.
