I have a L245 also doing the same. It did not leak when I first bought it but was running poorly. I bleed all the injectors which made it run like whole new animal. Obviously it had a little air in the fuel system somewhere. But now my front injector leaks at the top also even thought the fuel line nut is tight. I suspect the fuel line just isn't seating or may have a burr on it. I have the tractor torn down for a restore anyways so I will investgate further when I get to that point.