Black fuel leak at fuel filler neck when gas tank is full

Right now I'm looking at buying the fuel filler neck and fuel filler hose with clamps. From looking at the service manual, I'm wondering if I should also replace the 2 vapor hoses and pipe assembly? My muffler has been making a lot of noise as well rattling around so I may try and include that as well.

Okay, just realized that's the muffler, not the fuel filler neck, lol! So obviously the fuel is being leaked onto it from the fuel tank above. I guess that implies there's either a crack in the gas tank or it's simply from it being overfilled. Hmm. I wish I looked further up the chain with the camera earlier to see the source of the leak.

I guess this still must tie back to changing the fuel pump then. Unless there's a big coincidence going on and an unrelated leak started simultaneously. From doing some reading it's probably just a loose fuel line on the fuel pump, possibly a bad quick disconnect on the hose that has it. I know I checked both hoses for wear and cracks and they were in good condition. I also reconnected them as far as they'd go without causing damage. Does an old quick disconnect connector on one of the fuel pump lines sound like a likely culprit? Perhaps it was fine when undisturbed, but after being moved it isn't sealing again properly. Problem is I'm not quite sure which one to buy if that's the case.

I think I may have found the culprit. When I pulled up the metal plate covering the fuel pump, the whole canister was being moved around by the connector still attached. So I hadn't tightened up the locking ring nearly tight enough last time. This time I tightened it as tight as it would go. The quick disconnect on that hose seems pretty well attached, and again both hoses are in good condition. Hopefully that was the issue.

Does the loose locking ring on the fuel pump seem like a good culprit? Never had leaks before until we messed with the fuel pump. Which is just under the back seat, meaning we didn't touch the rest of the gas tank and fuel supply system. So I'm definitely hoping that this is all that it was.

This was just the Fuel Pump Tank Seal not being on right (and the locking ring which I had fixed before). It's really challenging to get that all back on right with that locking ring. Since there's a new fuel pump cylinder in there, I shouldn't have to mess with it for many years.

Hi Danny,

Yes, thank you, the fuel leak is fixed. It was the fuel pump tank seal not being properly in place. You guys are definitely very helpful so there's no doubt I'll continue to ask questions here.

Adam

Thanks Danny, I hope you are good as well. This problem resurfaced after I filled up last week. Both the fuel lines going to the engine and from the filler are properly connected to the fuel pump. So I ordered a new fuel pump tank seal/gasket (I still have the original one since I only replaced the fuel pump cylinder/module, not the whole canister. Bad choice in retrospect). My question is, should I use any extra sealer or lubricant to ensure a better seal? Anything to put in the threads of the locking ring or on the gasket itself? Any other tips to ensure the gasket stays in place and is properly lined up? I want to make sure and never have this leak again.

This was indeed the Fuel Pump Tank Seal/gasket. The one in there had a big tear that went about halfway down in one corner. Since replacing it, there is no more fuel leak and I'm guessing P0442 won't come back either (I also got a new OEM gas cap to help with that).