Dirty stain inside gas tank door

Roger T · Apr 26, 2014

Okinawa said: ↑

How about the outside door to gain access to the gas cap. Did you fully close it the last time you gassed up?
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Yes i did.

wjtracy · Apr 26, 2014

Got me to thinking, why is road dirt so black in color? Tire particles?
Nope they say brake particles:

Green Car Congress: Study estimates the composition of non-exhaust atmospheric particulate matter from traffic

Study estimates the composition of non-exhaust atmospheric particulate matter from traffic

11 June 2012

A study by a team of researchers in the UK has estimated the contributions of brake dust, tire dust, and resuspended dust to non-exhaust traffic particles as 55.3 ± 7.0%, 10.7 ± 2.3%, and 38.1 ± 9.7%, respectively, at their sampling site at Marleybone Road, London.
Increasingly stringent environmental regulations have resulted in substantial reductions in the exhaust emissions from road traffic, the team notes in a paper describing their work in the ACS journal Environmental Science & Technology. However, these reductions in combustion emissions have not been accompanied by similar reductions in nonexhaust emissions—i.e. the abrasive emissions from brake, road, and tire wear, and the resuspension of materials from the highway surface. As a result, these non-exhaust emissions make up a similar proportion of the airborne particulate matter (PM) resulting from vehicle use as exhaust emissions.
A separate study has predicted that in central Europe, the contribution of nonexhaust PM to total traffic emissions will increase to 80−90% by the end of this decade. ALthough the aerodynamic diameters of these non-exhaust particulate emissions tend to be larger than those of exhaust emissions, they still can enter the respiratory system and possibly lead to adverse health impacts. Sources and types of non-exhaust atmospheric particulate matter include:

Iron, copper, antimony, and barium from brake operation.

Road surfaces are generally composed of either concrete or aggregate with a bituminous binder and abrasion of such a surface is likely to result in particulate matter of mineral origin.

Tire wear is likely to result in predominantly carbonaceous particles, although small quantities of metals, in particular zinc which is used as a vulcanization activator, may be present.

Material resuspended from the road surface may include all types of vehicle abrasion debris, in addition to material from non-road sources which has been deposited on the road surface. This may include mineral dust from the local environment, typically including silicon, aluminum, calcium, and iron—particularly in arid locations. Within the United Kingdom, winter maintenance procedures involve spreading deicing salt on roadways, but the practices that are common in some northern countries of sanding roadways and fitting studded tires are not adopted.

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El Dobro · Apr 26, 2014

Sniff the rag and rub the residue between your fingers and you'll know if it's from gas or not.

Roger T · Apr 26, 2014

El Dobro said: ↑

Sniff the rag and rub the residue between your fingers and you'll know if it's from gas or not.
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Does not smell like gas... In fact I did.

Fore · Apr 29, 2014

Well what ever it is wipe it good and clean then add some car wax in the compartment to protect it and see if it happens again.

Dirty stain inside gas tank door

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