Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
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If they did check the pump seal for leaks as well as a vacuum test on the evap fuel vapor system and no leaks were found one of the most common leaks I have found is leaking fuel pressure line at the fuel pump.It may not leak to where it is seen to drip but will leak around the seal in the line that connects to the fuel pump and cause this here.In order to check to see if this is the cause as well as any other fuel line connections they need to run their fingers over the line where it connects to the pump and where any intermediate connections are located including at the fuel rail on the engine.This needs done after the vehicle has ran for a period of time (10 to 15 minutes).If any fuel is found on their fingers when they do this the affected seal or fuel line needs replaced to correct this here.
I find this is one of the hardest leaks to find and just this small of a leak will cause the smell you have.I suspect with all that has already been checked over and found o.k. this will be the case here.
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If the catalytic converter is partially restricted it is due to to much fuel in it and can give off this odor as well.I would have this checked as these can restrict over time and cause an issue like this here.