Slight rust in gas filler tube

[52Cadillac]

When I had the fuel tank gas fill neck tube apart I noticed some corrosion starting to form. On my old motorcycles I would line the gas tank with a coating made for this purpose, but was pricey. I only need to do the fill neck tube, as gas tank is new.. What have you guys used for this? One thing leads to another.
Thanks, Mike

[TJ Hopland]

Antique engine people deal with this stuff all the time.  Probably similar to the motorcycle people.   There tends to be a lot of buzz on the forums about various products and how they deal with modern fuels.   In many cases it appears they don't deal with it and the stuff ends up coming loose and causing more serious issues in the rest of the fuel system.   

[52Cadillac]

Roger that

[gary griffin]

  Possibly some "Heet" once in a while so the moisture is burned out with the gas. There will always be some moisture in a tank because some comes with the gas and some comes from the air that replaces the gas as you use it.

   Heet is basically a product you can buy at most auto supply dealers and includes alcohol that absorbs the moisture and mixes with the gas and burns off during combustion.

   

[52Cadillac]

Heet, how often is it used? Wouldn't a good fuel additive cleaner do that as well?
Thanks, Mike

[gary griffin]

Heet simply mixes with the water and the gasoline so it can be burned in the engine. How much to use depends on humidity in your area and how much water is in your gas. all gas contains a minute amount of water which eventually causes problems in the bottom of your tank because it is heavier than the gasoline. I would try a bottle of it and see what happens. If you have a good amount of water it may take more than one application.

[52Cadillac]

Maybe for future. Just installed new fuel tank.

[TJ Hopland]

Most gas now days has alcohol in it already.  Ethanol likes to suck up moisture like its relatives.   I don't know that I would want to add any more.   

[52Cadillac]

Does the grade of fuel we use make a difference in moisture content?

[gary griffin]

Yes and the time of the year does also. Summer gas has ethanol which brings water and lots of problems.  If you can find a 100% gas station use it.   l had one  near but it is closing.

[TJ Hopland]

The ethanol rules vary state to state.  One if the more interesting rules is that not all states require vendors to label the fuels that contain ethanol.   You may be getting it now and not know it.   In Minnesota they started using it 20 ish years ago.   Originally it was only in what they called the 'greater metro area' and just the winter months.  At some point they made it state wide,  year round, and in a grades.  I'm thinking that was more than 10 years ago now too.  Groups lead by the Minnesota Street Rod Association went to the state and got them to allow vendors to apply for a special license that would allow them to sell a premium grade fuel without ethanol.  So not every station has it but if they do its premium.   Some stations have both ethanol premium and the non ethanol premium so you really have to look for it. 

Originally there were issues due to the way they were making the blends and cleaning the tanks.  There were cases where people were only getting like 40% gas, the rest was water and alcohol.  Have not heard of that happening lately.  Hopefully the industry learned from the mistakes of the early adopters.  I am told that the blend happens at the local terminal when the tankers get filled that deliver to the stations.  Most areas only have one supply of raw 'gas'.   They take this raw gas and blend it with what ever combination of additives and ethanol the buyer wants.  This is how they get Branx X super gas and Brand Z regular.  Brand X may have a completely different additive package or it could even be the same package as Brand Z.