I used to have a ‘06 Colorado with evap code problems. Ended up having to replace fuel pump and pick-up in the gas tank.
Take a close look at it. It’s a real design flaw. Plastic tank with the pump top mounted in a depression or recess that is a perfect place for dirt and road salt to collect. Which causes rusty pin hole and bingo.... Evap code!

By the way; it was a fairly expensive part because it came as one entire unit. Even though it was just the metal top mount that was the problem. Not the pump itself.

Ive been a professional auto tech for 12 years and could probably count on two hands the number of fuel caps I've replaced that were confirmed to be leaking. Typical issues are degraded hoses, and leaking/stuck open purge valves and vent valves. The OP never stated the code, but a P0449 code as shown in the video absolutely cant be caused by a failed gas cap. The code description is "EVAP vent solenoid control circuit malfunction". It's caused when the PCM detects that the control circuit for the vent valve solenoid is not in it's commanded state (circuit is open or shorted to power or ground.) No code can give you an exact part to replace, just a good starting point on your diagnostic path. But a vent valve would be a good guess for that code.

Loosegoose I've been an auto tech for 29. He never said what the code was other than an EVAP code.

The shop Say it one of two things, say mostly likely solenoid, I believe, say if not want to get fixed now,that it really does nothing except for emissions an cause my check engine lite to be on, I would put in but considered well have trouble with something, the way the vid shows

Jesse, I didn't mean to imply that you were wrong, sorry if that's how you took it. Just that it's not a typical cause that I've seen. It seems different areas of the country see different issues sometimes. When I was in Illinois, I used to replaced rusted out fuel and brake lines literally every other week, did tons of jobs where every single line got replaced. Used to do fuel pumps every week too. Since moving back to Nebraska, I've probably done 5 brake lines in the last 5 years, and maybe a couple dozen fuel pumps. I do a lot of wiring issues though. Part of that comes with the territory of building police cars, but I do lots of non-aftermarket wiring repairs too. coonman, it sounds like your shop is guessing at the cause of your problem if they're saying it's most likely a vent solenoid. They should be able to say definitively one way or the other. But yes, EVAP codes wont affect gas mileage. The EVAP system keeps fuel vapors from leaking to the atmosphere, it's an emissions control system is all.

Could that cause u to smell gas? I not sure, if exhaust or gas but after park in carport,i sometimes smell gas, lightly, I have gas can in carport to. Not sure but if go to tailgate an stick head in, I smell gas, unless I smell exhaust, after shut off , no leaks nowhere

I suppose, but not usually. If it's just a vent valve stuck open the fumes pass though a charcoal canister, and if it's got a leak, typically the leak is so minisucle that you'd never know. Do you know the code that was pulled?

Can't rember what he say but he say almost for certain a valve or solenoid

That code is the least of your worries Coonman. forget about it and take care of more important things.

Did ya ever find the girl that went missing?