Join Date: Apr 2007
Location: Oxnard, CA, USA
It's a gravity feed, no pump. Much simpler and more reliable that way. There's a manual ball valve at the front left corner, which must be closed before filling the aux tank or else all the fuel will simply overfill the main tank and run out the normal overflow.
When the low fuel light comes on I reach back with my left hand, flip the lever 90*, then watch as the main tank slowly refills and the light goes out.
It takes about 20 minutes to transfer the 5 gallons through the 1/4" hose, but that isn't a problem as you can't burn the fuel up that fast anyway. Although fuel starts to flow as soon as the lever is flipped, it can take 5-8 minutes for the main tank gauge to register a change. That can be unnerving the first few times.
The real trick is knowing when the aux tank is full and when it's empty. Nothing worse than riding through the low fuel light and reaching back, only to find that you've already flipped the lever 200 miles ago . . .
'13 Dark Graphite Metallic K16GTLD, 24K miles and counting...
'09 Magnesium Beige Metallic K13GT, 60K miles miles and counting...
'02 Mauve Metallic K12LTC, 106K miles and sold
BMWLT#145, IBA# 366, MOA# 111996, SCMA# 24032
All lower 48 states plus Alaska on the K13GT in two weeks . . .
Some people see the gas tank as half empty. Some see it as half full. All I care is that I know where the next tankful is coming from...
Last edited by Meese; Jan 18th, 2010 at 11:00 pm.