Gascap, ESIM question... 08 Ram 4.7L

[AdventureDad]

I keep getting the "gascap" code on my 08 Ram 4.7 4wd. Ive inspected all the hoses, and everything looks clean. I had a crack in my fresh air filter just upstream from the charcoal canister. The filter was full of pebbles and dust. I cleaned it with compressed air, and patched the hole. (It's a new to me truck). On the ESIM valve, the white thing attached to the charcoal canister, I took it off, and cleaned the gasket. I Ohmed it out and I get OL no matter which way I tilt the thing. It has a weighted valve in it, that makes a vacuum seal during the evap test. Does anyone know how to better test this thing? I assume that when the weighted thing slides one way or other, it makes a connection. I read somewhere online that there should be 1 Ohm of resistance (unlike the NVLD system that has 130 Ohms). Nonetheless, I am getting OL, meaning there is no connection. Am I far off base with testing this?

 

[SYKRAMMAN]

I keep getting the "gascap" code on my 08 Ram 4.7 4wd. Ive inspected all the hoses, and everything looks clean. I had a crack in my fresh air filter just upstream from the charcoal canister. The filter was full of pebbles and dust. I cleaned it with compressed air, and patched the hole. (It's a new to me truck). On the ESIM valve, the white thing attached to the charcoal canister, I took it off, and cleaned the gasket. I Ohmed it out and I get OL no matter which way I tilt the thing. It has a weighted valve in it, that makes a vacuum seal during the evap test. Does anyone know how to better test this thing? I assume that when the weighted thing slides one way or other, it makes a connection. I read somewhere online that there should be 1 Ohm of resistance (unlike the NVLD system that has 130 Ohms). Nonetheless, I am getting OL, meaning there is no connection. Am I far off base with testing this?

I’ve read it could be a bad integrity module, also the pressure relief valve when the gas gets warm. The valve is on top of tank iirc.

 

[fastf]

You may still have a leak somewhere if you are inventive or want to buy or borrow yourself a evap smoker that smoke doesn't lie.

 

[AdventureDad]

I fixed it. The gasket from the esim valve to the charcoal canister was not put in correctly when the dealership I bought the truck from replaced it...due to a gas cap and P0440 code. I guess they did the diagnosis for me. I don’t trust mechanics so I retraced their steps. Success!