Check Gas Cap - Eval Valve fixed codes, but created new problem...EDIT: Fixed Maybe?

[Gwerner74]

I'm hoping someone here can point me towards the next thing I should look at to resolve my issue. 2018 RAM 2500 with the 6.4L Hemi, I've got the dreaded Check Gas Cap and P0455/P0456 codes. I replaced the EVAP Valve pictured below based on what I found here on the forum, and while it did fix the Check Gas Cap, the codes and the check engine light, with the new valve installed I can't fill the gas tank. When I put the old EVAP Valve back in, I can fill the tank again, but the codes and errors come back.

What else should I be looking at now that I know the EVAP valve isn't the only problem? Thanks in advance.

 

[tones2SS]

I had this issue on my 2005 Ram Daytona way back. (Glad to see that Ram FINALLY fixed this issue. Seems like a common issue on the Ram trucks for some reason. So sad actually. LOL)
I had my gas tank removed, replaced along with fuel pump, O ring and a couple of other goodies. It was all covered by warranty by the dealership.
Fixed the issue for me.

Good luck and keep us posted.

 

[Rado]

Please keep us UPDATED !!!!! Thanks

 

[04fxdwgi]

I'm hoping someone here can point me towards the next thing I should look at to resolve my issue. 2018 RAM 2500 with the 6.4L Hemi, I've got the dreaded Check Gas Cap and P0455/P0456 codes. I replaced the EVAP Valve pictured below based on what I found here on the forum, and while it did fix the Check Gas Cap, the codes and the check engine light, with the new valve installed I can't fill the gas tank. When I put the old EVAP Valve back in, I can fill the tank again, but the codes and errors come back.

What else should I be looking at now that I know the EVAP valve isn't the only problem? Thanks in advance.

View attachment 572152

Dorman made in china part.... 1st suspect to new problem that showed up when new part installed.

 

[crackerjack1957]

More Information for MOPAR 4861963AD

 

[Gwerner74]

Dorman made in china part.... 1st suspect to new problem that showed up when new part installed.

That was my first thought, 3 different valves, same problem.

 

[crackerjack1957]

That was my first thought, 3 different valves, same problem.

Maybe check for debris in the filler neck vent filter

 

[MOPAR78]

I had a similar experience, mine was the filter at the underside the gas fill neck. Opened it up and it was stopped up. Cleaned it with an air compressor and all was good.

 

[Gwerner74]

Maybe check for debris in the filler neck vent filter

I had a similar experience, mine was the filter at the underside the gas fill neck. Opened it up and it was stopped up. Cleaned it with an air compressor and all was good.

Thanks, I'll definitely check that this evening. Dumb question though, wouldn't a clogged vent filter cause the gas tank fill problem all of the time, regardless of the EVAP valve?

 

[DILLIGAF]

My fill problem was cause by this. So I cut it off....

I did an entire EVAP delete.

 

[MOPAR78]

Thanks, I'll definitely check that this evening. Dumb question though, wouldn't a clogged vent filter cause the gas tank fill problem all of the time, regardless of the EVAP valve?

Not sure, I was trouble shooting several issues at the time, clearing code's but cleaning the filter done the trick for me. Good luck!

 

[PA Ram]

Had same issue and replacing the ESIM fixed my issue. My truck's a 2017 Ram 1500 5.7. I used the dorman part and have zero issues. Could be the part you got was bad from factory.

 

[Gwerner74]

So I "think" the problem is fixed. Quick recap for anyone who didn't read all the way through, had the 0456 and 0457 codes along with the Check Gas Cap message. Replaced the cap, no joy. Replaced the Evap Leak Detection Valve and it cleared the codes, but then couldn't get gas into the tank faster than a trickle without the pump shutting off. 3 different Dorman valves, same result.

On a whim 2 weeks ago I went and grabbed a Duralast version of the valve and immediately noticed that it has a completely different internal design to the Dorman. It is also an exact match to the internal design of the stock valve. Not sure why that didn't register in my mind previously, but oh well. Every parts supplier I can find lists the Dorman 310-218 as an exact fit for my truck.

Slapped the Duralast valve in there and headed to the pump, no issues filling the tank. Cool, just gotta ride it out now to see if the codes pop again. 2 weeks in now and so far no codes and no problems at the pump. First fill attempt was from 3/4 tank, second was from 1/2 tank, and today's third fill was from 1/4 tank. Probably irrelevant, but I like data points to confuse myself with later.

So for now I'm calling it fixed, and just accepting that for whatever reason, my truck in particular didn't like the Dorman version of that valve. It is entirely possible that the Dorman valve fully exposed a problem elsewhere that the Duralast valve is masking until it fails like the OEM one did, but I guess only time will tell.

Dorman 310-218 on top, Duralast ESM1000 on bottom. Externally they are identical, internal is a completely different design.

 

[Bigskyroadglide]

In my humble opinion, Dorman hard parts (bolts, wheel studs, exhaust manifold bolts) tend to work better than dorman soft parts, like the aforementioned evap valve.

Sometimes they are the only thing you can find, unless you go to MA Mopar.

 

[Grams]

Had same issue and replacing the ESIM fixed my issue. My truck's a 2017 Ram 1500 5.7. I used the dorman part and have zero issues. Could be the part you got was bad from factory.

will someone please decipher “ESIM” for me?

 

[PA Ram]

will someone please decipher “ESIM” for me?

Evaporative System Integrity Module