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  #1 (permalink)  
Old 12-08-2015, 02:22 PM
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aluminum vs steel for gas tank

What are the pros and cons on aluminum vs steel for a gas tank. I can weld either one so that's not a major consideration.

Do they both need a coating on the inside?

Is finishing either one a concern?

What gage is normal for either?
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Old 12-08-2015, 08:27 PM
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Aluminum takes special etching primers..I proved that on my shovel the first time I painted it..It will lift off after a few years..I still have the original paint on the rear steel fender but not my aluminum tank..as far as the inside I think aluminum is good to go..I would go with steel because of the paint...
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Old 12-09-2015, 06:37 AM
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coating the inside of the tank either steel or aluminum could be a good idea to make sure it is sealed and that there are no pin holes or other leaks in the welds that could make a mess of your paint further down the road.
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Old 12-09-2015, 02:44 PM
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vibration stresses can be an issue with either, but obviously more with aluminum. doesn't mean it will be a big problem or soon, but a design that develops stress cracks over time in steel (as many do), will suffer these problems sooner in aluminum.

that said, a well designed and mounted aluminum tank is pretty cool, and i'd consider it. especially polished.
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Old 12-09-2015, 04:22 PM
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if the tank is made well and welded properly it shouldn't leak, if it does on test, re-weld till it's sound.... dont use a sealant as they all react with modern ethinol fuels and peel or. flake off.... residue will get into and bugger ya carb AND can fuck the top end of ya motor.... best thing to stop a steel tank rusting (which takes years anyway in the worst case) is to use the damn bike..... (1000 miles a year is NOT useing it!!)........ and who paints an aluminium fuel tank???.... pointless to use Aluminium if it's to be painted....
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Old 12-09-2015, 06:32 PM
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What Pete said. Also if you use thick enough aluminum and rubber mount it, it should last forever and also have no corrosion issues. If you can weld aluminum it's a no brainer.
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Old 08-20-2017, 09:28 PM
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Keep in mind that aluminum condensates 3.75 times more that a steel gas tank.
Do you want that moisture problem inside the fuel tank?
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Old 08-23-2017, 11:42 AM
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I love aluminum tanks. No need for a liner.

Beautiful polished or, for my taste- scotch brite finish.
For sheet metal , whenever I can I always use aluminum.
Stress fractures? Good design and rubber iinsulation is the key. And without paint - easy fix.
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