Sanec1, don't have experience with your EFI setup, but 1.) you should run the bike, pull the EFI relay so the gas on the high pressure side runs out, do not want to release that fitting with 50 psi fuel in there. 2.) shut down and pull main fuse, no need for sparks now. 3.) you stated that a manual was nearby, did you review how the hoses are removed, some require special tools to remove, others are compression fittings and o-rings or combination of both...some even have a button that releases the fittings (imagine that...!). 4.) once apart, do the o-ring(s) look like they have a flat spot? You may have to use a micrometer to get the exact dimensions. Just because it looks the same size does not mean it is correct when installed. 50 psi of fuel can squeeze thru VERY easily if not right. 5) make sure it is OIL/GAS resistant, a RUBBER one will NOT do it, VITTON or NEOPRENE type WILL.