Well, as I think about it, the EVAP test only happens between 1/4 and 3/4 full. And it happens periodically, not sure how often.
So if the tank is really full, the test is suspended due to the fact that you have too little air in the tank for a good test.

Drive the car and let it get down to 1/2 tank and you should, eventually, see the CEL and get a code, if there is a leak.

No matter the level in the tank or the condition of the EVAP test, the car should run fine, the fuel pressure is regulated to 58psi, so the engine should never see variations in what is going on in the tank.
Now, if pump or filter/regulator are screwy, then the pressure may vary and SURE the car will act up then. The engine will idle down to about 20-25psi, and you can drive the car down to 35-40psi, but it won't run right and it wont like throttle positions beyond maybe 1/4 open. Ask me how I know!

This is the one I have:
https://www.summitracing.com/parts/o...apHx7F7TXogjjc

Measuring fuel pressure is easy - the kits are $30-90 and are easy to use. I have one at home and have used it three times in five years.