2018 RAM 1500 Fuel Tank Fill Issue

DoneThat · Dec 27, 2021

With later fuel tanks the rollover valve is incorporated into the filler hose fitting.

horace33 · Jan 1, 2022

I've had some trouble w' my short box long cab '18. I've come to the conclusion, the nozzle is the problem, varying from pump to pump, station to station. Try it, worked for me.

dbergfalk · Jan 24, 2022

TheKid7 said:
My regular cab 2018 RAM 1500 2WD is starting to have fuel tank fill issues again. Some time back I had this issue and the Dealer (Under Warranty) replaced the fuel fill nozzle first followed by replacing the fuel tank. Now the vehicle is out of Warranty and the problem started again.

When I first start filling with the minimum flow possible, I can hear the nozzle fill up. If I keep repeating trying to add to the tank it will over flow.

I went to a different gas station. This time I would fill until the nozzle fills up/clicks off. Wait about 30 seconds for the nozzle to drain down and repeat a few times. Eventually, I could fill the truck (minimum hand pressure only) at an extremely low flow rate of maybe around 30 seconds/0.1 gallons.

Note: Normally I never top off the tank once the fuel nozzle clicks off.

My other 2018 Truck has been showing some hints of the same issue. I have never had any work done on its tank.

Note: Since New, both RAM trucks could never handle more than the lowest gas pump fill setting.

What does the fuel tank check valve look like? This may be a bad idea, but would it be feasible to use a new piece of stiff vacuum hose, run it down the fill nozzle to bump/unstick the fuel tank's check valve? I have never done this.

What is the best/recommended way to investigate/correct this issue?

Thanks in Advance.

I just found this a few minutes after making this post. It applies to a Cummins Diesel but should work for Gasoline. Any comments?

2 Gen Dodge: Slow Fuel Fill Fixed! SO EASY!

Mine's a 2002, but many of the 2gen Dodge Rams have had slow refueling issues. Fix was MUCH simpler than I thought it'd be!Subscribe for more videos! I answe...

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My 2020 ram would not fill. Dealer wanted $1000 to replace tank and neck. I left inside heated garage overnight (I live in Minnesota and this was a winter problem). The last four fills have not clicked off at all. Dealer says it still will be needed to replace. Has anyone else tried this and does it seem to be a winter problem? I hate to pay for unneeded repairs.

TheKid7 · Jan 26, 2022

The Dealer replaced the carbon canister yesterday. I picked up the Truck today and filled it up without any problems.

So I guess that the problem was the carbon canister.

TheKid7 · Jan 27, 2022

I had to take the Truck in again today because there was an intermittent clicking sound when the engine was running. They said that it was a loose clamp for the exhaust pipe/muffler and that they tightened it up. The sound is gone now.

Does the exhaust pipe/muffler have to be moved to change the carbon canister?

Thanks in Advance.

councalled · Jan 28, 2022

TheKid7 said:
I had to take the Truck in again today because there was an intermittent clicking sound when the engine was running. They said that it was a loose clamp for the exhaust pipe/muffler and that they tightened it up. The sound is gone now.

Does the exhaust pipe/muffler have to be moved to change the carbon canister?

Thanks in Advance.

The carbon canister/vapor canister sits on the gas tank, and they are on one side of the shaft. The muffler is on the other side, so answer is no. I dropped my gas tank more than a month ago to check the gas tank check valve. I learned that you just need to remove the heat shield on the gas tank, and you can change it out.

councalled · Jan 28, 2022

TheKid7 said:
I complained to RAM and was given a Case Number.

I took the truck to the Dealer for a diagnostics on the cause of the problem.

The Dealer said that the tank fill nozzle check valve was OK and that the problem was the carbon canister. They ordered a new carbon canister which may take a month or so to arrive due to parts shortages.

I still don't understand that when the fuel tank vent line was temporarily disconnected and I tried to fill the tank the problem was still there. Doesn't the tank vent line go directly to the carbon canister?

Thanks in Advance.

You're lucky. I am having trouble trying to get a vapor canister due to back order. And yes, the gas tank has a vent line to the canister. It could be that the MFCV detects a leak from the disconnected line, so it doesn't open to valve. Maybe that's why the problem is still there. I might be wrong.

Atcer2018 · Feb 10, 2022

DoneThat said:
Remove the spring from the roll over valve. It is located in the top of the tank.
It is a very light spring and can be done without removing the tank.
See my post in another thread, (Fueling issues)

So I tried the rollover valve spring removal and while it offered a little better efficiency during fueling it did not solve the issue. I must still pump the gas rather slowly and without the spring in the rollover valve gas will overflow. Definitely an improvement but not the actual fix to the problem for me. Anyone have any other ideas?

tap4154 · Feb 11, 2022

I had the filler neck replaced in my 2018 RAM, and since then it's worked great at every gas station except one. It's a really low end gas station, and it doesn't look like they maintain their equipment very well. I never top off. Once it clicks off, I pull the nozzle out.

seabrook · Feb 11, 2022

dbergfalk said:
My 2020 ram would not fill. Dealer wanted $1000 to replace tank and neck. I left inside heated garage overnight (I live in Minnesota and this was a winter problem). The last four fills have not clicked off at all. Dealer says it still will be needed to replace. Has anyone else tried this and does it seem to be a winter problem? I hate to pay for unneeded repairs.

a 2 year old truck and the dealer wanted to charge you???? It should still be under warranty!! Put the name of the dealer on here for all to see!

Hookedup87 · Feb 11, 2022

That’s insane. That should be covered. How many miles on your truck? Factory warranty is 3/36 bumper to bumper isn’t it? Plus that issue is a known problem. Dealer did mine on my 2018 back in 2021 with a $100 deductible.

jmlopez1969 · Feb 14, 2022

my Ram 2018 1500 crew cab is doing this as well. I guess I better take it to the dealership. I bought the extended warranty, so I hope it covers this. Its a real pain in the hind side to fill up.

Sinistre1 · Feb 16, 2022

If you have MaxCare warranty it should be covered.... Ask me how i know.

tap4154 · Feb 16, 2022

Hookedup87 said:
That’s insane. That should be covered. How many miles on your truck? Factory warranty is 3/36 bumper to bumper isn’t it? Plus that issue is a known problem. Dealer did mine on my 2018 back in 2021 with a $100 deductible.

About a year after I bought my 2018 truck, I finally convinced the service manager to put the updated filler tube in for me, and they didn't charge me anything. Initially they played dumb like they didn't know it was really an issue, then one of the service writers told me that he actually had that problem, and that they had to send a mechanic out to pull a nozzle out of a lady's truck. My issue was only about to steep filler tube, thankfully I haven't had any of the other issues yet. I make sure to never top off, so I don't mess up the charcoal canister.

JPT · Feb 22, 2022

I just want to say thank you to this thread. I brought my truck into my local dealer, told them that I am having a hard time putting the gas nozzle in at gas stations, and sometimes it is almost impossible to remove the nozzle after filling. I brought the replacement neck tube part # and they did the swap. I also let them know I did NOT have a problem with the nozzle clicking off during filling. It was coved under Maxcare...

Here are a couple pictures AFTER I got it back and when to fill the gas.

Here is a video I made to send to my brother (he has the same problem with his '18, but also has the problem where it clicks off during fill)

The bad news, when they were replacing the filler, I think the mechanic stretched the fender liner over the bed arch. The paint got rubbed off to the primer right at the lip of the arch. I brought it back yesterday and they are going to send it to a body shop to repair.

turkeybird56 · Feb 22, 2022

Sinistre1 said:
If you have MaxCare warranty it should be covered.... Ask me how i know.

(Why I bought added Maxcare when my 3/36 expired in Aug 2021)

Revelation2212 · Feb 23, 2022

I had the problem several times in the 440,000 km now on my pickup - 2014 RAM 1500 Hemi 5.7 and discovered what a simple fix it was.
There is a small inverted canister about 2.5" diameter x 5" long with a small hose attached secured under the box beside the fuel fill pipe.
That canister has a paper filter in it that will get plugged over time, sooner if you drive dusty roads.
Then if you drive in wet humid weather, or if you wash underneath the truck - (I have a 90 degree nozzle to wash under body thoroughly from road salt), the paper filter will get wet and the dust in it turns to mud and then hardens. When filter is completely plugged you have the effect that everyone complains about - unable to fuel up at more than a trickle.
I have purchased twice but didn't like the price so the last time I pried it apart and gently washed and rinsed the paper filter, air dried with blow dryer and then reinstalled.
That's as simple as it gets but was frustrating until I figured it out.

tap4154 · Feb 24, 2022

Revelation2212 said:
I had the problem several times in the 440,000 km now on my pickup - 2014 RAM 1500 Hemi 5.7 and discovered what a simple fix it was.
There is a small inverted canister about 2.5" diameter x 5" long with a small hose attached secured under the box beside the fuel fill pipe.
That canister has a paper filter in it that will get plugged over time, sooner if you drive dusty roads.
Then if you drive in wet humid weather, or if you wash underneath the truck - (I have a 90 degree nozzle to wash under body thoroughly from road salt), the paper filter will get wet and the dust in it turns to mud and then hardens. When filter is completely plugged you have the effect that everyone complains about - unable to fuel up at more than a trickle.
I have purchased twice but didn't like the price so the last time I pried it apart and gently washed and rinsed the paper filter, air dried with blow dryer and then reinstalled.
That's as simple as it gets but was frustrating until I figured it out.

Thanks for the information. I just looked up under my truck and see that canister up there. It's just zip tied in position. If I take that down and remove it, should I expect a face full of gasoline? I've had the filler neck replaced, but occasionally it's beginning to give me fits if I fill it at a high rate.

Tony67ss · Mar 2, 2022

I just had the same issue come up on 2019 1500 with 32k miles. Just took to dealer and they said gas tank needs to be replaced. They are replacing free because it’s been less than 30 days since I purchased vehicle. The service dept said this is becoming a known issue and knew right away a new tank was required. I’ll provide updates

Update: the new tank is installed and have not had any issues filling up. They also replaced fuel pump due to pump nipple leading to vent line was broken. The service receipt states the check valve was sticking in the tank.

Wanted to include part number in case anyone wants to look it up.
Fuel tank: 68323675-AC
O ring: 55366298-AA
Fuel pump: 68399000-AB

2018 RAM 1500 Fuel Tank Fill Issue

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