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You might not need to replace the whole tank, it's more likely that one of the pumps or level gauge has come loose and is leaking. I had that happen a while back. It wasn't a fast leak, so left it until I had the front wheels off for something else. The tank can be accessed if you pull back the wheel well lining on the passenger side. I took a photo at the time.
You can see there's a couple of pumps vertically secured - one for the headlights, one for the windscreen, and to the bottom there's a horizontally secured level gauge. In my case, that one was leaking fluid. I took it out, cleaned it and shoved it back in and used some fresh sealant, and it worked.
Now, I put the bloody thing in upside down the first time - leading to a warning light for 'low fluid' when it was full. I had to do it all again and this time, make sure it was installed the right way...If you do end up doing something similar, learn from my mistake and make sure the 'floaty-flap bit' of the level gauge will rise when submerged (face up).
Not for what I needed to do, which was access the pumps/level sensor and check for leaks. Not sure what you'd need to do if you actually had to remove/replace the whole tank, but I doubt you'd need to take the door off. You should have all the access you need from the wheel well and the engine bay
The “filler neck seal” is known to leak. As outlined in the workshop manual, this is easily corrected by replacement of the seal via access behind the “fender splash shield” in the “wheel well”.
Removal of any door would be irrelevant as these components cannot be reached from the door opening.
If it's like the leaky filler seal in the X100 models, then that is about a third of the way down the tank so the fluid leaks until the tank is 2/3 full.
In Bob's case, the tank is apparently emptying completely (different thread) so it must presumably be one of the lower seals for the pumps or level sensor.
That happened to me a long time ago, and there was a crack in the plastic tank. You might be able to repair it with epoxy. I had my dealer do it and they replaced the tank.
That happened to me a long time ago, and there was a crack in the plastic tank. You might be able to repair it with epoxy. I had my dealer do it and they replaced the tank.
Unfortunately, epoxy might work for a short while on polypropylene or polyethylene but it will start to leak again, as mine did when cracked. However, you can buy special two part adhesives/fillers which are designed for low surface energy PP and HDPE. The glue, such as Infinity Bond MMA500, tends to be expensive but you only need a small amount and you don't need a cartridge gun as you can measure and mix the stuff manually.
