Just a quick video showing how I found a large evap system leak on a 1999 Dodge RAM 1500 v6 Magnum with error codes PO443 and PO455. (Not the Gas cap)
The Check Engine Light would turn on after a short drive after the owner had cleared the codes. The codes were not present when I did this repair because the battery had died right before he brought the truck to me.
The owner had also already replaced the gas cap.
I had carefully looked at each hose in the diagram shown in the video to make sure there were no splits or cracks and made sure that they were all connected.

You will see in the video where I found the leak just above the charcoal canister.

It wasn't necessary to take down the entire canister bracket/assembly, but it made it a lot easier to show/film the repair. I was unable to find the small 3way rubber piece of that evap harness. I did find the entire harness listed, but it was shown as discontinued so I made it work with some 5/16" hoses and a plastic T fitting.

https://amzn.to/3KEczvm Motorad Replacement Gas Cap
https://amzn.to/3OWPh7l Blue Silicone Hose I used in the video
https://amzn.to/37aGk9g Black Silicone Hose I used in the video
https://amzn.to/3LFYleM 5/16 Fuel Hose
https://amzn.to/3FaGNEW 5/16 Plastic T fitting

This DIY Smoke Machine has been amazing at helping find evap leaks.
Smoke Machine components:
https://amzn.to/38Geyyf Cheap Soldering Iron
https://amzn.to/3mL3qVO LocTite 5 minute epoxy
https://amzn.to/3mZLAi5 Bic Pens
https://amzn.to/34M58zW Mineral Oil
Here's a link to the YouTube video I watched to make this simple but effective DIY Smoke test evap machine:

   • BEST automotive smoke machine you can...  

Or you can buy a smoke machine on amazon here: https://amzn.to/3vEz5Qn

It's been a week since I fixed this, and the Check Engine Light has not come back. The owner just checked and there are no codes pending and all of the monitors and tests are complete. It is now ready for California Smog test.

Thanks for watching!
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Dan the Fix it Man
www.danthefixitman.org
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Song used in the video:
'Love the Messenger' by Freedom Trail Studio

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