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Hey everyone. I'll be converting a 2 gallon 2014 Sportster Tank from EFI to use on my 81 GS450S. I know I'll need to fabricate an adapter to fill the sporty's old hole with a hole for the original petcock. The petcock on my GS450 is vacuum operated and has the gas and vacuum hoses on them. Does anyone know if the original stock gas cap was vented or nonvented? Will I need to use a vented or nonvented gas cap on the new sporty tank? The sporty tank has a gas overflow tube that dumps out of the bottom. Will this be as simple as fabricating the adapter and mounting the petcock to the new tank? The original GS tank didn't have an overflow tube. Will I need to seal up the overflow tube on the sporty tank? Does the vacuum line on the GS petcock have anything to do with the tank being vented or nonvented? Or does it have more to do with activating the diaphragm so gas can flow into the carb? Any help is appreciated! Thanks!
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The "overflow" tube is most likely a drain from the filler cap area, not an overflow from inside the tank.
The Sporty tank has to be vented to some degree, although it may not be enough for a gravity flow system.
The vacuum tap has nothing to do with the venting of the tank - it just shuts off the tap when the engine is not running.Current:
Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha
)
Past:
VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
And a bunch of other crap Yamahas.... -
The sporty overflow definitely comes from the filler cap area. My guess is that would be enough of a vent for a gravity flow system to work but I could be wrong.Originally posted by hillsy View Post
Good to know. This was some of the confirmation I was looking for. I didn't want to be a mile down the road on a maiden voyage with this new tank and get stuck because of fuel starvation. Does anyone know if what I'm attempting will work with just an adapter?Originally posted by hillsy View PostComment
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It wont be a vent to inside the tank - it will be a drain to remove rainwater / spilt gas that sits in the filler cap area. IE: outside the tank.Originally posted by Milge View Post
If you mean an adapter to mount your GS fuel tap, then yes it should work....depending on the venting of the Sporty tank.Originally posted by Milge View PostCurrent:
Z1300A5 Locomotive (swapped my Intruder for it), GS450 Cafe Project (might never finish it....), XT500 Commuter (I know - it's a Yamaha)
Past:
VL1500 Intruder (swapped for Z1300), ZX9R Streetfighter (lets face it - too fast....), 1984 GSX750EF, 1984 GSX1100EF (AKA GS1150)
And a bunch of other crap Yamahas....Comment
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Considering that you are installing a 2-gallon tank, you won't get too much farther down the road before you will be looking for a fuel station, anyway.Originally posted by Milge View Post
Good thing it's only a 450, you might actually make it to the city limits with your limited supply.
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Originally posted by Steve View PostConsidering that you are installing a 2-gallon tank, you won't get too much farther down the road before you will be looking for a fuel station, anyway.
Good thing it's only a 450, you might actually make it to the city limits with your limited supply.
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