2003 Nissan Murano SE AWD
I'm not at all confident that they did an acceptable job. Makes me wonder if they were trying to spin the ring the wrong way. Not a speck or smell of fuel around the pump. I never smelled fuel while MO was parked in the garage, only smelled it faintly when driving sometimes.. I think bank 1 running rich is the issue. Could be something new, though. I forgot to mention that the owner/mechanic refunded the labor involved with installing the fuel pump.From experience, getting the whole float/pump assembly back thru the top opening can be challenging to say the least. I would be worried that something was forced and maybe slightly bent, causing a float issue.
You should not be smelling any gas when the car is parked. Reading that it took two men to remove the retaining ring gives me concern about the reinstall. A square O-ring is usually between the tank and assembly, prone to partially rolling while fiddling with getting the lock ring into proper position. The float/pump assembly needs to be firmly pressed down on the gasket to prevent any movement.
If the gasket is not an issue, you should check the entire fuel recovery system for loose, broken or missing parts and hoses. Charcoal fuel recovery canister may be at the end of it's life, one of the main reasons there's usually a gas odor from older cars.
EDIT: I had a hard time visualizing two grown men trying to spin off a retaining ring while holding onto the same tool. Since there's no rust on anything, it's likely they were either pushing down too hard and preventing the ring from turning, or they had the tool positioned on the wrong thing.