This has probably been a subject of many questions in the past.
I recently performed an injector balance test. After the initial pressurizing of the rail I let it sit 30+ seconds to see if the pressure had any bleed down (for all 6 cyl). It did not.
Injector Balance results:
Cyl
1 58psi 42psi
2 58psi 42psi
3 58psi 43psi
4 58psi 42psi
5 58psi 42psi
6 58psi 42ps

I also performed the cylinder power balance test several times; there were zero misfires reported.

I checked for fuel odor around the tank and vapor canister; nothing.

I can detect a very slight fuel odor in the engine bay while it's running. I'm assuming there are no leaks in the injector/FPR system, or it would have shown as a drop in pressure during the injector balance test (correct??).

Where else could fuel cause an odor in the engine bay?

 

I had this happening last week and found a fuel leak due to a loose connection on the stainless steel fuel line(s) at the back of the engine compartment.

It was only visible with the engine running- I could see it dripping with a flashlight.

Tightening the nut solved the issue.