Turns out the gasket was pinched so some fuel was getting out. The problem should hopefully be fixed now. Gotta be slow and careful when replacing that gasket...
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Thank you everyone for the rapid responses. I severed the line trying to remove it from the vehicle and replaced it as part of the job. He said he had to drop the tank to get to it and I'm sure that was the bulk of his labor as the pump replacement sounds pretty simple.
I hope he replaced the gasket when he replaced the pump. The work order says he replaced the assembly and I figure that means the gasket as well but I'll ask him when I go over there.
I mainly wanted to know if there was anything else that could allow/cause this to happen. I guess the gasket and that large black screw are the next culprits?

p.s. Sorry Klaus, I should've specified that the hose was broken by me exercising my learning curve in the picture. :^)
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According to your picture, I wouldn't even start the engine. Send this picture to the mechanic, ASAP. The nipple is broken off, and he did it!

Why did he replace the sender?

Klaus

Please tell me that photo was taken BEFORE the mechanic repaired it, and not after.

If he replaced the entire sender unit, then every connection there is his responsibility. Also, it might be that he just didn't get the large bunk nut tight or the rubber seal isn't in quite right.

Unless one of the hoses is leaking somewhere away from the connection to the sending unit, then he just needs to go back in and correct his error at no charge.

I would top the tank off and have another look-see to determine where it's still leaking BEFORE you take it back to him. That way you can point it out to him and he can't pull the wool over your eyes.