Hi,
If you notice the smell only when you exceed a specific amount of fuel being added, then chances are the tank has a leak.
It is possible, based on where you live, rust may have caused a leak. Also, it isn't uncommon for the seal where the pump is mounted to leak.
If you look at pic 1, I circled where the pump mounts and highlighted where the filler tube enters the tank. Crawl under the vehicle and inspect around where the filler tube enters for evidence of a leak. Also, check the filler itself for possible rust issues
Next, you can not see the pump mount from under the vehicle, so we need to check it a different way. If you remove the rear seat, there is a service port that can be removed to replace the pump. Remove it and inspect around where the pump mounts for evidence of leaks. (See Pic 2)
I am basing this on the idea that it only smells when you add fuel over a certain level. If that is wrong, let me know.
Also, let me know what you find or if you have other questions.
Take care,
Joe.
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Tuesday, November 24th, 2020 AT 7:55 PM