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1996 G36 fuel leak while filling up - Help
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Posted 5/28/2022 2:00 AM
VanillaGorilla
Member


Date registered: Mar 2021
Location: St.Gallen Switzerland
Vehicle(s): 2005 G55K AMG
Posts: 8

1996 G36 fuel leak while filling up - Help

I just aquired this 1996 G36 AMG, beautiful car in superb condition.

The only problem the car has:

When filling up, there is a pretty big amount of fuel running out of the big hose / tube that goes over the fuel tank.

I made a short video:

https://www.youtube.com/shorts/rMgEhv49mDw

Things i have noticed:

- I can not fill it with the nozzle "fixed" until it clicks when it is full
- I can not fill up the tank 100% - 75-80% max
- When the fuel gauge is at about 50% the needle starts to "wiggle" very nervous between empty and half full when driving over bumps ect.
- The dripping

Does somebody have a idea where to start? Air in the tank?

Thanks!
#243615
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Author
Posted 5/28/2022 9:54 AM
J.R.
Elite Veteran




Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
500
Re: 1996 G36 fuel leak while filling up - Help

OP,

Video helps. The fuel is running out very close to the exhaust pipe so I would recommend not driving it until the issue is resolved.

There are several vent lines that you will want to take a look at because at least one is no longer attached or has broken.
- There is one about half way up the filler neck that goes to the tank.
- There is one that goes up and over the rear door from one corner of the tank to the other.
- There should be a vent line related to fuel tank gas evaporation management that goes through a system and then is drawn into the engine when it is running.

Then there is the return fuel line.
#243616 - in reply to #243615
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Author
Posted 5/28/2022 11:52 AM
VanillaGorilla
Member


Date registered: Mar 2021
Location: St.Gallen Switzerland
Vehicle(s): 2005 G55K AMG
Posts: 8

Re: 1996 G36 fuel leak while filling up - Help

Thanks, yes i will have it checked at MB the next few days.
It is only while filling up - as soon as i drive off, it stops. Also no dripping when i stop and park the car.

Regards

Ben
#243617 - in reply to #243616
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Posted 5/28/2022 2:51 PM
VanillaGorilla
Member


Date registered: Mar 2021
Location: St.Gallen Switzerland
Vehicle(s): 2005 G55K AMG
Posts: 8

RE: 1996 G36 fuel leak while filling up - Help

Problem solved - there is a cracked hose.

Thx
#243618 - in reply to #243615
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Author
Posted 5/29/2022 10:07 PM
J.R.
Elite Veteran




Date registered: Apr 2006
Location: Southern Maryland
Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold)
Posts: 828
500
RE: 1996 G36 fuel leak while filling up - Help

VanillaGorilla - 5/28/2022 2:51 PM

Problem solved - there is a cracked hose.

Thx


Which one? Pics would be great to help others in the future.
#243623 - in reply to #243618
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Posted 5/30/2022 1:27 AM
VanillaGorilla
Member


Date registered: Mar 2021
Location: St.Gallen Switzerland
Vehicle(s): 2005 G55K AMG
Posts: 8

RE: 1996 G36 fuel leak while filling up - Help

It was probably a very specific problem on my car (I've only had the car for a week).
There is an additional tank installed under the car. From the filler neck for the tank goes a second line to this additional tank. This line was connected with a hose and clamps. The hose had a crack. When refueling, gasoline ran into this line and dripped through the crack.
#243624 - in reply to #243615
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