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Converting EFI Tank

  • Thread starter Thread starter Milge
  • Start date Start date
M

Milge

Guest
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!
 
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.
 
hillsy said:
The "overflow" tube is most likely a drain from the filler cap area, not an overflow from inside the tank.
Click to expand...

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.

hillsy said:
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.
Click to expand...

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?
 
Milge said:
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.
Click to expand...

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.



Milge said:
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?
Click to expand...

If you mean an adapter to mount your GS fuel tap, then yes it should work....depending on the venting of the Sporty tank.
 
Milge said:
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.
Click to expand...
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. :oops:

Good thing it's only a 450, you might actually make it to the city limits with your limited supply. :-\\\

.
 
Steve said:
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. :oops:

Good thing it's only a 450, you might actually make it to the city limits with your limited supply. :-\\\

.
Click to expand...


Hahahaha :D
 
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