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BLM Auxiliary Fuel Tank and Mount

As you can see by these first pictures this is a pillion mount system, set up for gravity feed. As I have read the modification that can be done to the main tank petcock, I figured there may be a different way and this is what I came up with. It functions by removing the vacuum from the main tank petcock. This way, the fluid flow is stopped. Then with the aux. tank "tee" installed in the main supply line between the petcock and the carb, it allows either system to supply the carb.
This shot shows the set up mounted from the left side.
 Vacuum valve in aux. position
Vacuum valve in the main position
 The system does not contact the seat.
Vent line detail
 View from the rear

Quick disconnect. Shows the system I use for the vent line as well as the routing.

The mounting system can be used with standard, off the shelf poly tanks as well as the custom aluminum ones we manufacture. System comes with all items need to install. It can be used with a pump if the rider would like to. The gravity feed system we use has proven after many thousand of miles to be very dependable. 

Visit our site at as new items are developed they are added to the site.

Article By: Bill McAvan

Updated January 2005 

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