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General Forum : More Gas Tank Issues - Euro 316 e21

- BMW E21 Community
   - General Forum
      - More Gas Tank Issues - Euro 316 e21
  Posted Tuesday, May 1st 3:07am [Edit] [Quote] [IMS] [View car]

Post nr. 6


When filling up my tank - it would appear that only one of the two tanks are filling because it only takes $35 of gas and the gas meter only records half full.

And then it leaks out the front of the dual tanks!

There is no gas around the O-ring.

Any thoughts?

Peter


  Posted Tuesday, May 1st 9:52am [Edit] [Quote] [IMS] [View car]

Post nr. 547


as I understand it, there is a rubber hose that connects the 2 tanks. Likely yours has been clogged/blocked somehow. Others will ahve to give you details on how to replace it, though.

  Posted Tuesday, May 1st 5:31pm [Edit] [Quote] [IMS] [View car]

Post nr. 333


I was thinking along those lines as well, but he the OP said that the gauge was showing 1/2 tank after filling up. If the hose between the two tank was plugged than it should show a full tank.

I can tell you that the leaking fuel is more than likely deteriorated vent lines between the two tanks. I had the same problem and had to drop the tanks to replace them. If you go through that trouble then you can check the hose between the two tanks at that time.

  Posted Thursday, May 3rd 3:02am [Edit] [Quote] [IMS] [View car]

Post nr. 203


Yeah I seem to leak fuel when I fiil up only, I came go to 3/4 but on full it drip's out.....Unsure where from though as the leak was to high up and I couldn't get to it......

  Posted Thursday, May 3rd 5:18pm [Edit] [Quote] [IMS] [View car]

Post nr. 279


Used to have a leak on top of the LHS tank. Only discovered it after the breather hose got plugged up and decided at the same time to check the condition of the tanks.

Luckily I had a donor car to cannibalise.

You might want to check it out.

Good luck!

  Posted Friday, May 4th 7:47am [Edit] [Quote] [IMS] [View car]

Post nr. 206


That's weird, depending on what way the breather line's flow, unless their free-flowing ( both way's instead on only one flow directon ) because it's my right hand tank just a little behind the driver's door (RHD). I haven't checked the hose's yet......

  Posted Friday, May 4th 4:39pm [Edit] [Quote] [IMS] [View car]

Post nr. 280


I believe it needs to go both ways - to let excess pressure as the fuel expands as the day heats the car up.

It also needs to let air in so that it does not create a vacuum as the fuel is used up.

The most obvious symptom of a blocked breather hose is when there is a pressure release when you open your fuel cap. One time, I had a nearly full tank and the pressure had built up - fuel spurted out the fuel filler when I opened it.


  Posted Sunday, May 6th 11:41am [Edit] [Quote] [IMS] [View car]

Post nr. 208


Damn.....That'd be intresting, you go to put fuel in and it spit's it out at you......You'd be like WTF??? Hahaha, yeah I think they go both way's too.....

  Posted Sunday, May 6th 1:09pm [Edit] [Quote] [IMS] [View car]

Post nr. 23


yeah i get the fuel leaking out the front end of the tank when filled up, makes a nasty mess and is more importantly costing me money.


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