Found this through Google. Directed me back this way.
bikedave99
Well-Known Member
JoinedSep 7, 2007Messages394Reaction score3Location
AR
Sep 29, 2010
No worries man, here is how it works. There is no actual reserve tank, only the main tank under the seat. There is a sensor in the tank that tells the fuel pump controller when their is only
.8 (ish) gallons left. The fuel pump controller then turns on the red low fuel light in the instrument cluster and begins to intermittently shut off the fuel pump. This causes the bike to surge and sputter and guarantees that you realize you are real close to pushing your 800lb behemoth home. When you flip the switch on the handlebar from on to reserve, you are forcing the fuel pump to run normally again. Don't forget to flip the switch back when you get gas!
Hope this helps!
This is a flawed explanation in several ways.
The 'fuel pump controller' is actually just a circuit in the ignition box.
The sender in the fuel tank changes its resistance when it's no-longer immersed in fuel. This change in value is read-by the electronic ignition box, and it shuts-off power to the fuel pump, period. There is
no "intermittently shuts-off the fuel pump" function. The pod switch once thrown to
'reserve,' restores electrical power to the fuel pump. If you leave it on 'reserve,' and re-fill the tank, you can run the tank dry, and never see the low-fuel lamp illuminate. Get in the habit of pulling to the gas pump, and switching the reserve switch back to the main tank, and turn-off the ignition.
I don't-own an
800lb behemoth and neither do-you, assuming we're both speaking of the Gen. 1 VMax. The Service Manual from Yamaha rates the USA-market bike at 624 lbs. filled with oil, water, and gasoline. A weight-gain of 176 lbs is what happens when you marry the prom queen, and 10 years after that dance, she's put that on, and maybe a bit-more, the trailer floor is going-soft on the side where she sits on the couch all-day, and the queen-size bed mattress is shot, on her side, causing you to have nightmares of rolling-towards a warm pit, which is what's happening, every-night.
Learning the proper function of your bike is important to understanding what's happening when it's
not properly-functioning. It's kinda-like a teen marriage on the rocks, someone's gonna-get a double-wide. Or a big repair bill, if you cannot troubleshoot things properly.