Simple Madass : DIY Fuel Indicator !!

I learn the idea (simple idea) after seeing how the fuel indicator from an old engine in my shop.

What a brilliant yet simple !

The idea is to have a clear tube outside of fuel tank, and connect both upper and bottom of tube back to the tank. As fuel is fluid, the level inside the tank will be the same as the level on the clear tube !!

The easiest way is to cut the fuel line after the petcock, then add T-connection, one goes to the petcock, one goes to the carb, and one goes to the clear hose. The clear hose need to be tie-wrapped to body in safest possible position, up to the tank's screw hole under the seat. from there, remove the screw, and put the hose inside, and put sealant over it. how to see your fuel level, just check the height of the fuel on the clear hose !

but i want to make it a little bit "smarter"

this will include small tube (actually, a new reaservoar tank of brake fluid).

how ?

1. from the T-junction, connect clear hose  (short) up to the place of the brake fluid container (it can be mounted at the same position as the rear brake fluid reservoar, but on the other side - left side - )

2. brake container have rubber membrane which act like a bellow, it can contract/compress depend on fluid level inside.

3. to set the level, you need to drain the fuel at specific position (hopefully at the same level as the brake reservoar tank), then open the tank cover to "equalize" the pressure. then close it.

4. at the time fuel is higher than the level set on step 3, the rubber membrane inside brake canister will push all the way to the top, this can be use to trigger switch for indicator

5. at the time fuel is lower than the level set on step 3, the rubber membran will pulled to the bottom, hopefully the switch mechanism relase and trigger a light or something.

my only problem is, this is still idea yet, still looking the right switch, T-junction, and the clear hose.

graphically, can be seen below. should be simple and "do-able"