(I just got the scoot yesterday, haven't had time to see if the Fram will interchange with the stock gas cap, might take a different one) I made a plug on a lathe that attached to the Fram cap and accepted the brass fitting into the 3/8 - 24 thread. The tank's output went to a hand valve then through a quick-disconnect marine connector then through a tube to an angle brass fitting that screwed into a Fram RSO-66 oil cap. I fabricated a 3+ gallon aux tank for my Silver Wing (RIP) that worked well. Not a newbie to riding or farkling (50+ years) but to Burgman 650's. So you may have to disconnect the breather line and check the flow on the valve to be certain it will work otherwise you'll have to remove the fuel tank and have a bung welded on. I am not sure if you can connect to the fuel cut valve on the top of your 400's main tank or not as I didn't get to explore this on my own 400. Now keep in mind this was installed on a 650 and has a different connection setup to the main tank via the filler neck. With the rollover valve option, the check valve and empty fuel filter can be eliminated. I could of avoided all that and had a rollover valve installed in place of the normal vent nipple my tank has, but, this tank was already made up so I went with it. Only thing i'd want to change on my own setup is to combine a pressure relief valve running parallel to the check valve on the vent line so it would take care of having any fuel spillage during a tip over and vent when the vapor pressure gets too high on a hot day so as not to cause fuel to leak from the main fuel cap. Fill main first, put the cap back on, then fill the aux. It won't overfill the fuel tank any more so then you would filling the tank yourself at the pump. But, otherwise it continuously feeds the main as the fuel level drops so long as i have my valve open. I do have a hand valve on my aux tank's outlet line but it's more or less there so I can use it just as a "gas can" when I want to to fill up other stuff and not have it feeding the main. Will have to decide on which option to go with otherwise works pretty well at extending the distance. Or, put a 3-5 psi pressure relief valve where the check valve is. So, in light of this should have went with the rollover valve option and forgone the check valve and empty fuel filter and simply just made it vent straight to atmosphere through the puke tank. Releasing the pressure on the aux tank and switching back to using the vented cap solved the problem. I quickly found out that the extra vapor pressure from the additional fuel was too much for the stock fuel cap to hold back so it was leaking around the fuel caps seal. So, came outside to go to lunch and found a small puddle of fuel under the bike. One disconcerting observation I noticed at work was made when I decided to try just the normal non-vented fuel cap on the aux tank. Interesting thing is given the long running average for the extra mileage, the computer and hand calculations agree on the mpg figure. So 45.55 mpg with a mix of rural, urban and interstate riding. Got a distance of 263.6 miles and put 5.787 gallons back between the two tanks. Finished up my first little test out of this setup running it until the gas pump icon started flashing.
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