[stroguy]

An innocent question because I don't know. As part of my winter painting plans for the bike I want a black gas cap. This may only be accomplished by cutting out the OEM filler neck and and cap assembly. My painter is a well accomplished welder and I have no fears that he would do a perfect job welding in a replacement cap. But when I quizzed him at what needs to be done to protect the new welded area from corrosion he looked at me like I just kicked his dog. He shook his jowls and said 'that is a great question'.

So the question is how does the inside of a fuel tank prevent corrosion? Galvanized coating? Gas is not a corroding fluid?I really haven't a clue.

 

[///Matt]

'Rust' is caused by the oxidation of a ferrous (iron-containing) metal. In order to oxidize, the metal must be subject to oxygen. Gasoline is composed of primarily carbon and hydrogen (C8-H18), and as such cannot directly oxidize a ferrous metals.

Most gas tanks that rust do so because water gets into the tank (H2-O) which of course contains oxygen.

Once your tank is finished being welded, obviously the outside will be painted to protect from corrosion.

 

[disgruntled0311]

If left just sitting there for an extended period of time, it eventually would corrode. If motors are going to be static for an extended period of time, the fuel is flushed from the system and and a preservative ( oil based) is put in. When your ready to operate it, you flush the system with fuel again.

 

[///Matt]

it will eventually corrode in the areas not saturated with gasoline. Storage periods add a whole other problem with gasoline, which is that it basically degrades into varnish. Clearly, you don't want varnish in your tank, fuel pump, fuel lines, or fuel injectors.

 

[stroguy]

'Rust' is caused by the oxidation of a ferrous (iron-containing) metal. In order to oxidize, the metal must be subject to oxygen. Gasoline is composed of primarily carbon and hydrogen (C8-H18), and as such cannot directly oxidize a ferrous metals.

Most gas tanks that rust do so because water gets into the tank (H2-O) which of course contains oxygen.

Once your tank is finished being welded, obviously the outside will be painted to protect from corrosion.

Pfffffft........is that the best you can come up with?



J/K sounds great, thanks.