[scottynoface]

Yup, don't run the pump dry. Just drain the tank and the fuel lines, the 636 pumps are finnicky no reason to throw more stress at it. It primed when you turn the key so no worries when you go to start of again.

[loudnlow7484]

You don't flush with water. You purge with diesel fuel or just let the inside of the tank dry out through evaporation and then swish enough motor oil around to wet the entire inside surface. About half a cup of oil should give you enough to get the job done pretty quickly. You're draining the excess back out, anyway so in the end you'll end up with a couple tablespoons in there, tops.

Note: If you actually purge with diesel then you shouldn't need to coat with oil. The diesel should provide enough coating for rust prevention.

Alternatively, you could try using fogging oil that they use in marine engines during storage. That should do the trick pretty effectively.

[Wild-Bill]

Never tried that stuff. Does it come in an aerosol or something?

[loudnlow7484]

Never tried that stuff. Does it come in an aerosol or something?

I've seen in in aerosol and in plastic jugs.

[Wild-Bill]

Reason I was asking about an aerosol is the name "fogging" oil. It'd sure be nice if you could just spray it in the tank and get a fog of oil that would hit even the top of the tank.

[loudnlow7484]

Reason I was asking about an aerosol is the name "fogging" oil. It'd sure be nice if you could just spray it in the tank and get a fog of oil that would hit even the top of the tank.

I think they call it that because they spray it into the engine while running to coat the cylinders, not because it actually makes a fog when it sprays. Its whole purpose though is to protect metal parts while sitting, though, so I'd expect that it would be a good choice for fuel tank protection.

[numus]

This isn't fully correct... yes, it does create a preventative coat. It does NOT stop oxidation from occuring. Put a piece of aluminum in water, and come back 3 days later. You will have a nice fuzzy bar.

Never leave aluminum in direct contact with water.

Getting all the water out of a tank is near impossible with out using something else that would be better to flush with anyways,... this is why you don't want to flush with water. If any is left inside, that spot will continue to corrode... and can form a hole.

Krey

It stops oxidiation from occuring in the bare metal under the aluminum oxide.. which is what i originally stated...

[Kreylyn]

It stops oxidiation from occuring in the bare metal under the aluminum oxide.. which is what i originally stated...

No, it doesn't stop it. It can slow it down for air exposure, but direct contact with water sitting on it will continue to corrode the aluminum.

If it did stop it, then polished rims would turn dull (oxidiation) but wouldn't pit... unfortunately for those who polished their rims, they find out soon enough that oxidation layer alone isn't good enough to prevent them from pitting.

Krey

[numus]

No, it doesn't stop it. It can slow it down for air exposure, but direct contact with water sitting on it will continue to corrode the aluminum.

If it did stop it, then polished rims would turn dull (oxidiation) but wouldn't pit... unfortunately for those who polished their rims, they find out soon enough that oxidation layer alone isn't good enough to prevent them from pitting.

Krey

Thats due to the alloy composition...
Find a scuba diver with a DOT rated 3AL tank that has been submerged in salt water for hours or longer at a time.. Or that has been sitting with moisture in the tank... Then clean off the aluminum oxide and see how much pitting was done.... I have an E6498 with a 3AL overstamp, Original manufacture date of 1981, that no one will recertified eventho the 3AL overstamp means the tanks is certified past the expiration of the E6498 exemption that you can have if you want to do some tests....

[loudnlow7484]

Thats due to the alloy composition...
Find a scuba diver with a DOT rated 3AL tank that has been submerged in salt water for hours or longer at a time.. Or that has been sitting with moisture in the tank... Then clean off the aluminum oxide and see how much pitting was done.... I have an E6498 with a 3AL overstamp, Original manufacture date of 1981, that no one will recertified eventho the 3AL overstamp means the tanks is certified past the expiration of the E6498 exemption that you can have if you want to do some tests....

I've never seen a motorcycle that used a scuba tank as a fuel tank.

[numus]

I've never seen a motorcycle that used a scuba tank as a fuel tank.

The point was alloy composition. Rims are very low aluminum content because they would fold under the weight of the car. Aluminum is very malleable.

[scottynoface]

The DOT approves scuba tanks?

Is that for guys who want to use them in the soapbox derby?

[Wild-Bill]

Yes, the Department Of Transportation specifies standards for pressurized vessels. (Like SCUBA tanks.) It's a matter of packaging pressurized gasses for transportation. Conveniently, the same standards can be applied to rating them for use.

[numus]

The DOT approves scuba tanks?

Is that for guys who want to use them in the soapbox derby?

They are actually the only agency that has any regulations over pressurized vessels. Everything from Propane tanks to aircraft oxygen storage bottles, from Fire extinguishers to firefighter SCBAs are regulated by DOT.

Yes, the Department Of Transportation specifies standards for pressurized vessels. (Like SCUBA tanks.) It's a matter of packaging pressurized gasses for transportation. Conveniently, the same standards can be applied to rating them for use.

Yup you use to be able to look up alloy specifications based upon the exemption number, but now with the 3AA steel and 3AL aluminum ratings, you only know the rough composition of the alloy.

[Kreylyn]

Thats due to the alloy composition...
Find a scuba diver with a DOT rated 3AL tank that has been submerged in salt water for hours or longer at a time.. Or that has been sitting with moisture in the tank... Then clean off the aluminum oxide and see how much pitting was done.... I have an E6498 with a 3AL overstamp, Original manufacture date of 1981, that no one will recertified eventho the 3AL overstamp means the tanks is certified past the expiration of the E6498 exemption that you can have if you want to do some tests....

This is relevant to the this board discussion, parts on any motorcycle, or in anyway dismisses my point... "don't leave water on your motorcycle aluminum parts"... How?

Krey