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gas tank filling problems

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My 2001 SLK320 shuts off the gas station nozzles just as though the tank were full. This causes me to only be able to get about 0.1 to 0.2 gal of gas in at a time. That makes filling up the gas tank a very time-consuming and frustrating job. This happens no matter how empty or nearly full the tank is. It happens at all gas stations, and is especially bad at some older stations that pump at a higher rate.

Some other makes of cars have had problems with a ORVR system (Onboard Refueling Vapor Recovery).
Othersd have said it might be a fuel limit vent valve.
Are these the same thing?
Where are they located?
How do I get this solved?
Thanks, cwsaylor

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Re: gas tank filling problems

Hi I would have your Tech check the fuel tank pressure line/vent valve operation and the charcoal canister.If all is well you may need a new tank not uncommon.Tech 08

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Re: gas tank filling problems

Tech 08;177221 wrote:
Hi I would have your Tech check the fuel tank pressure line/vent valve operation and the charcoal canister.If all is well you may need a new tank not uncommon.Tech 08

Wow! I am amazed that it could be the tank, itself. What aspect of the tank would make this happen?
I took a look inside the filler neck of the car. There is a black plastic "sleeve-like" thing just inside that is sort of funnel shapped and looks like it is snapped into place. I think it would guide the gas station nozzel to the middle of the filler neck. It has some small slots around it. around it, there are two fork-shapped black plastic segments of it that should snap it into place, I think. There are two larger segments - going around a little over 90 degrees of the periphery that comprise the funnel/guide part. There is something at the top which looks like it could be a sensor of some kind. I can see that one of the larger segments which is the one toward the top has a piece broken off of it about 1/4 inch by 1/2 inch. The 1/4 inch bevelled part is broken off for about half inch around the periphery right below what I think might be a sensor. Do you know if it is actually a sensor?
How do you go about replacing this thing?
Of course, I also wonder if the piece that is broken off could be down in the tank causing problems there.

I sincerely appreciate your help and guidance. Thanks,
CW Saylor

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1982 380SL
Re: gas tank filling problems

charlessaylor;177201 wrote:
My 2001 SLK320 shuts off the gas station nozzles just as though the tank were full. This causes me to only be able to get about 0.1 to 0.2 gal of gas in at a time. That makes filling up the gas tank a very time-consuming and frustrating job. This happens no matter how empty or nearly full the tank is. It happens at all gas stations, and is especially bad at some older stations that pump at a higher rate.

Some other makes of cars have had problems with a ORVR system (Onboard Refueling Vapor Recovery).
Othersd have said it might be a fuel limit vent valve.
Are these the same thing?
Where are they located?
How do I get this solved?
Thanks, cwsaylor

You might also check the insert in the filler tank neck for proper operation and orientation. I've heard of them, at least on other models, somehow being out of position and causing similar issues.

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Alan

Some times you just need a bigger hammer.

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Re: gas tank filling problems

Mercedes dealer said there are only three replacable parts pertaining to the gas tank.
1.)gas cap, 2.) the black plastic funnel-like guide inside the neck, 3.) the fuel pump.
Otherwise the whole tank and filler neck system has to be replaced for about $1500.00 (I remember when that was a lot of money!)
I bought the funnel-like part which is now made of white plastic. I am almsot certain it will not fit my car!!
I took some of the clues here on this discussion site, and I got a three foot length of hose - it is gas line hose and kind of stiff. I stuck it into the tank. It met with some resistance about 10 inches in and about 18 inches in. I rotated the hose while sticing it in past the slight resistance place at 18 inches so that I could push on "Whatever" all the way around. It is into gasoline at or just beyond that point. I then went to the gas station and has no problem putting gas in for the first time in a year!!!! Thanks for the clues. I hope I continue to have no more problems. I used 5/16 inch hose(inside diameter). The outside diameter is about a half inch.

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