Fuel Cell/Bladder in Tank

Stephen Hill · Mar 15, 2022

The fiberglass tanks on Commandos have a pretty bad rep. And the replacement tanks from India often have their issues. Ethanol is hard on steel tanks. Makes me wonder why we aren't putting an internal fuel cell (or bladder) inside the stock Commando tank?

lazyeye6 · Mar 15, 2022

Let us know how that works for you. I'd take my chances on a steel replacement tank with no enhancements.

Tornado · Mar 15, 2022

How would a bladder setup work with the two petcocks?

Onder · Mar 16, 2022

Airplanes often have bladders. They do work. But yes there would have to be fiddle for the petcocks. Anything is doable at some level.

jan nelder · Mar 16, 2022

cost!!

EstuaryBoy · Mar 16, 2022

At the wrong side of 65 I don't view bladders with the same confidence that I used to!

Stephen Hill · Mar 16, 2022

EstuaryBoy, perhaps a little Caswell tank liner with your morning coffee??

EstuaryBoy · Mar 16, 2022

Stephen Hill said:
EstuaryBoy, perhaps a little Caswell tank liner with your morning coffee??

It's the preparation that puts me off!!

outawack · Mar 16, 2022

My tank is baffled so you could never get a bladder in there. A lot of the dirt bike guys use filter bags in the tanks.

Tornado · Mar 16, 2022

outawack said:
My tank is baffled so you could never get a bladder in there. A lot of the dirt bike guys use filter bags in the tanks.

I believe many dirt bikes have all vent/feed lines running out near or through the filler cap, no? Would be easier to work a bladder that way.

rweb · Mar 17, 2022

It seams to me the easiest fiberglass tank save would be to make a plastic tank with petcock bungs and a filler to mate with the original cap. Make it slightly smaller so you could cut the bottom out of the fiberglass tank and fit it over the plastic tank.

texasSlick · Mar 18, 2022

rweb said:
It seams to me the easiest fiberglass tank save would be to make a plastic tank with petcock bungs and a filler to mate with the original cap. Make it slightly smaller so you could cut the bottom out of the fiberglass tank and fit it over the plastic tank.

What plastic would you use that would be impervious to ethanol?

Slick

cliffa · Mar 18, 2022

texasSlick said:
What plastic would you use that would be impervious to ethanol?

Slick

The same plastic that petrol containers are made of should work

I think it's polythene.

Craig · Mar 18, 2022

Whatever Acerbis uses in their upsized dirt bike tanks would work , some swelling reported but no leaking ….

Fuel Cell/Bladder in Tank

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