OK so my check engine light keeps coming on and throwing the code

P0442 - Evap System Small Leak Detected Fault

I was wondering if there are any common problems to throw this code? I know if the leak is small I will probably never find the problem. Any help is appreciated.

 

and yes the gas cap is tightened correctly

 

leaks in the fuel lines to the tank and fual cap can cause this.

 

You can make a basic homemade smoke tester, you can find" how to"vids on YouTube and I think I paid 30 bucks all together, mainly on a low pressure regulator and some length of rubber hosing. It's best to do it in darkness rather than bright lighting. And you'll need a decent bright flashlight, or uv light depending on which way you choose to go. I used incense and and powerful led flashlight.
update:
I finally got my p0442 code to go away,and to be honest. I'm not sure how, I made sure no smoke was coming from the fuel lines, or tank area. I put the old gas cap that came with the truck back on,and I replaced that damn little 35$ red plastic fitting on top of the intake (I think it's the hard plastic line that comes from the brake booster). Anyway, I know it's not much to go on but one of those 3 things did the trick. Good luck

 

I'd start by replacing the vapor vent solenoid (AIRTEX/WELLS 2N1016) for around $22.00. It's located right by the cruise control pump. To look up the part cross reference it off of a 2000 Chevy 3500 Express Van with the 5.7L V8.


geez another thread from the past.

 

https://www.ebay.com/itm/ACDelco-GM-...QAAOSwud1W~r7K