Mold/mildew around fuel fill? - Toyota RAV4 Forums
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post #1 of 14 (permalink) Old 08-24-2014, 05:55 PM Thread Starter
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Mold/mildew around fuel fill?

How come there is mold or mildew around the fuel fill area on my super white '11 base? I washed it today to get rid of the mold/mildew and general grime.

My guess is that this is the result of my using ethanol and Toyota having a fuel system vent near here. I understand that I can quit using gas containing ethanol, but I don't understand a gas vent here. I thought the fuel system was vented through the charcoal canister to prevent vapors escaping to the atmosphere. And if there is still pressure in the system, why not vent it somewhere else when then fuel filler cover is released?
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post #2 of 14 (permalink) Old 08-24-2014, 09:13 PM
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Weird space for mold. This area dries fast is just metal/paint.
Are you sure someone did not spray grease/oil in the area to protect from rust?

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post #3 of 14 (permalink) Old 08-24-2014, 10:16 PM
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Our '06 has it too. Even has black blotches on the red paint around the rear end of the gas door. Almost like evaporating fuel causes it but my cap is tight and I don't spill gas when filling.

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post #4 of 14 (permalink) Old 08-25-2014, 01:57 AM
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So far none of that on my RAV. Maybe caused by rainwater, snow melt, etc. accumulating and not evaporating under the fuel filler door?

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post #5 of 14 (permalink) Old 08-25-2014, 02:03 AM
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If it is indeed mold, clean it up and wipe some grease/silicone grease.

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post #6 of 14 (permalink) Old 08-25-2014, 02:22 AM
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Yeah, this area under the fuel filler door gets filthy fast. It's an easy spot to miss after a car wash. Doesn't seem like mold to me, it's just road grime. It seems like the gas fumes attract it. And it happens on my other car too.

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post #7 of 14 (permalink) Old 09-10-2015, 10:27 PM
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I am also having this black substance that looks like mold appearing on, in and around my fuel fill door. I've also seen it on my 1996 Avalon XLS and my friend's Mercury. I do wash it off as best as I can but it reappears quickly and is unsightly.

Does anyone know how to prevent this?
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post #8 of 14 (permalink) Old 09-10-2015, 10:40 PM
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Quote:
Originally Posted by David in NC View Post
How come there is mold or mildew around the fuel fill area on my super white '11 base? I washed it today to get rid of the mold/mildew and general grime.
I have the same model and had the same condition. It is not mold or mildew, but just dirt that is not cleaned out with a normal wash. I wiped mine out with Armor All and it has stayed clean for a long time.
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post #9 of 14 (permalink) Old 09-17-2015, 08:11 PM
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Originally Posted by pico View Post
I have the same model and had the same condition. It is not mold or mildew, but just dirt that is not cleaned out with a normal wash. I wiped mine out with Armor All and it has stayed clean for a long time.
Thanks for this tip, Pico! I just happened to have a container of those Armor All wipes and sure enough, 2 of them were more than enough to take that grime off easily. I never would have thought of using them for that. Much easier than doing it with a soapy rag like I did before. Hopefully the protectant will help keep it clean. Thanks again!

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post #10 of 14 (permalink) Old 09-18-2015, 08:32 AM
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For those that don't use Armor All products (contain silicone):
- spray inside fuel filler cavity & door with glass cleaner foam & wipe off with a clean paper towel
- won't hurt or contaminate paint
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