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Wow! This is one bad @$$ gauge! Keep it up, man!

Hi guys, I've tested the functionality of our dual-tank project on a long distance drive and I can say that it was a success!

Here are some pics of the system we've made:


This is where we put the gas tank.


This is the fuel switch we installed


This is what it looks like inside my utility box


This is the "T" connection which links the two gas tank

A vented cap may solve the problem of undesired transfer. I visualize your system as the fuel path from each tank goes to a "T" and then to the vacuum valve and then to the carburetor. The pressure in the auxiliary tank (with no vent to atmosphere) pushes the fuel into the main tank. Am I on track, so far?

You have a great idea to extend the limited range of your scoot. It is also a great idea for several models including the People GTi300 which will go 100 miles with a TINY reserve. It is a great cruiser but with about 2.4 gallons is limiting options for refueling thus requires a red plastic gas can strapped on somewhere. All kinds of specialty shops make aux tanks but it is up to the installer to make it work. You are, so far the pioneer in developing a usable system.

Most aircraft have two or more fuel tanks plus a system of selecting tanks to feed the engine(s). Each tank is vented independently. On, off and crossfeed is a manual function of the pilot. The basis of these systems is simplicity.

Karl

Hi Karl,

Thank you!

Yes, you are right! The upper and the lower tank meet at a "T". What we did now is we installed an on-off fuel switch but instead of putting it in the fuel hose, we installed it on the vacuum's breather hose. In that way, the fuel pump's vacuum won't be working if the breather is shut. I'll be testing the system for a long ride the day after tomorrow. I'll be having them full tank and we'll see how it goes. I'll be sharing some pics later for others to visually understand what we're talking about, Karl.

I haven't found any vented fuel cap as of the moment.

Thank you for your time!

I will bet your lower tank has a non-vented cap or no vent whatsoever.

Karl

HI Karl,

So what you are suggesting is to change my tank cap to a vented one?

We're planning to put a switch so that I can close the vacuum from the fuel pump. I'll be using the higher tank first and when it goes empty, that's the time I'll be switching on the vacuum to trigger the fuel pump.

Any thoughts, guys? 

Hi guys, I would just like to ask if there is such thing as one way fuel valve?

We have successfully installed an additional 5 liter fuel tank on my 150 and I tested it for 2 days. What I've observed is the fuel from my under tank flowed up to my upper tank, hence, it over spilled after using it for 2 days.

Any thoughts? Thanks!

I'm from the Philippines and I use Mizzle M89 130/14. It's a good all-around tire.