sach22

Hi All,

Have a strange issue with my 2015 S550 4matic. Love this car.

When I go to fill gas, I place the nozzle in and click the little latch so that I do not have to squeeze the trigger continuously (This is something we all do). Now that it is a colder temperature in the Chicago area, I set the filling nozzle and go back to sit in the car while it fills. However, recently, when I set the latch so it fills, it clicks off like the tank is full with only dispensing a few gallons of gas. I have to reset it continuously in order to fill the tank. In fact, now I'm not really ever sure if the tank is truly full bc it clicks off so frequently. I just have to guess if it is full. It's annoying to have to constantly get back out to reset the latch to fill gas or have to babysit it.

Has anyone else experienced anything like this?

Appreciate your thoughts!

SW20S

Try pulling the filler neck out of the opening slightly...

bkdc

This is what happens when the tank has been overfilled. There is a charcoal filter/canister and if the charcoal gets displaced from an overfill, the gas nozzle keeps clicking off even if the tank is not full.

The solution is a replacement of the charcoal canister at the fuel tank. It’ll cost a few bucks at the dealer. Or if you’re under warranty they may do it under warranty coverage. The best way to avoid this is to NEVER TOP OFF YOUR TANK after automatic shutoff.

My problem occurred when I filled my tank with spare gas from a storage container and I inadvertently overfilled to overflowing. Lesson learned.

superswiss

Is it specific gas stations? Different car, but my current AMG is the first car I've owned that requires me to fiddle with the nozzle every time before it starts properly. It's specifically at Shell stations in my area. They all have awkward nozzles now that don't seem to fit properly, and it's difficult to make a good seal. If the seal is not proper, then the pump clicks off. I had no issues with their previous nozzle design and I also did European Delivery with no issues fueling all across Europe. Shell is my preferred brand, but their nozzles are really annoying me. Once the tank is full, I also have to twist and pull to get the nozzle off. It first doesn't make a proper seal, but once the seal is good, it's so good that there's a vacuum and the nozzle can't be removed easily. What seems to work most reliably is if I hold the nozzle in place for a bit before letting go. That seems to seal it properly and then it won't click off as soon as I let go. One of the pumps at the station I frequently fuel, still has the previous nozzle design and I always use that one if its free. Never having issues with that one. I was trying to find a picture on Google, but haven't found one. The nozzles that are giving me trouble are those that have like a rubber snorkel on them and the nozzle only sticks out at the very end of it, so you have to push it in and compress the snorkel. Don't know what they are called.

BenzV12

I have also learnt that you should not overfill your fuel tank after the system shutoff . Perhaps, a stupid idea but give your car a jiggle and try again

cfmistry

My car did it as well. As I was about to clean the charcoal filter (there are instructions on the “other” MB forum), I decided to try another gas station. Seemed the problem was limited to that first station after all. Haven’t had that issue since in about 20 fillups.

daddcap

This happened to my 2014 S550 when it was still under the extended warranty. They had to replace the charcoal filter/canister and they would not cover it since it was operator error. I think it was around $650 parts and labor.

The only way I could fill the car was very slowly no matter what gas station I went to, or any fiddling with the gas nozzle.

MBS63AMG

Ditto. That is what I was going to say. Certain nozzles may have a steeper curve in them so that when the nozzle is fully inserted, it is spraying the fuel directly on the lower wall of the neck of the tank. This causes a backup of the flow resulting in the handle shutting off as it is signaled that the fuel tank is full. When you pull it back out around 3 inches or so, the fuel will flow freely.

sach22

Thanks all.

I'll see what adjustments I can make at the next trip to the gas station.

I definitely do not want to spend $650 to fix a filter problem.... Can I do this myself?

Thank you all again!

Detailingdoc

Interesting you bring this up. I just had my 2015 in for service and this was one of my issues.
i have to fuel very slolwy or it will keep going off.

The dealership said there was nothing to fix and put a bulletin sheet in my car and some other material regarding thr fuel neck and the filler flap which i havent fully read.

It is interesting to hear about the charcoal filter being the cause. Unfortunate if it is not covered under extended warranty.

Jay04SL

Have the same thing going on with my 2015. Dealer is saying it's from a cracked filler-neck and entire tank needs to be replaced. $5,400. How could the filler-neck be broken and there's not a trace of gasoline smell?

badq45t

Time to go to a good Indy mechanic and see what workaround there may be. One thing about the stealership, they are only interested in the most expensive solution.

vatakle

This has happened on multiple cars for me. I have noticed it happens a lot if I go to fill it up when the gas is quite low, there is lot of air which needs to escape. Need to keep a gap between the rubber housing and fuel hole to let the air out. It does mean I have to hold on to it but now I don't let it go low on all my cars. Would fill it up at around 25% and no issues. Gas station attendant confirmed this could be one of the reasons.

Tom in Austin

Good info, thanks for posting. I'm a habitual 'over-filler' on my other cars but for some reason have always stopped on the first click on the S550. Maybe just can't bear to see the dollar total on the pump go any higher ... LOL