Rusty,Scott, on my B7500 a few ounces of fuel spills out while unscrewing the fuel bowl. Actual fuel flow stops before the bowl is completely unscrewed. I place a container below the bowl to capture the leakage. I empty the bowl, remove the old filter element and wipe it clean before reassembly of the new element. Fuel starts flowing again while I am screwing the bowl back on (container still below bowl). Usually, the bowl is full of fuel and leaking before I get it on tight. Trapped air has never been a problem for me. Note correct installation of the small and large O-rings during disassembly. Don't lose them, as they don't come with the filter cartridge. I bought spares when I bought my last filter. I also bought a spare filter in case I ever have to do an emergency field replacement.
Thank you very much for following up with the extra information, I appreciated it. My tractor has very low hours and I haven't changed the fuel filter on it yet. Using a bright flashlight I can see a couple small bits of sediment at the bottom of the bowl and the filter looks very good.
I bought a new filter last week to change this weekend. As you mentioned, it didn't have the O-rings in the box. I didn't notice this until I got home and was wondering if it was a mistake and they were left out. I wish either the dealer would have told me or that I would have just opened the box while I was there.
From past experiences I don't trust used O-rings. I'm going to wait to change the filter until I can get a new set of rings.
Thank you,
Scott