Gas Gauge

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TheBlueStreak

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Gen II owners, when one bar is flashing how much gas is left in the tank???

 
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1.3 gal i think... figure 40 easy miles and then next 20 are iffy.. after that you need a 1 - 800 to a prayer tower.

 
Rode South Dakota 34 at 0' dark thirty for 48 mile with one bar flashing, wheeeeeeeew!

 
IIRC, the tank holds about 6.5 gals. The gauge counts down the first 5 gals. The last bar starts flashing at the end of those first 5 gals and reverts to "reserve" where the odometer resets to zero and starts counting up indicating how far you've traveled on reserve. Depending on what your gas mileage has been will determine how far you'll go on reserve. I'd think 40 miles would be comfortable, over 60 would be pushing it a bit. ( No pun intended )

 
I can confirm at least 25 miles after the reserve flashing countdown begins. I estimate 40 to 50 miles total on reserve.

 
BUT your question, now answered, deserves a more lengthy answer (and every knows I'm good at that!).

You should have enough gas, while the "reserve" is flashing, to travel 40-60 miles, or more, to refuel. Prudence would dictate that this should not be a habitual modus operandi. The gas in the tank also cools the fuel pump. If one were to ride their bike well into reserve every tankfull, it might be assumed the heat and possible added stress could shorten the fuel pump life cycle.

(Just one man's opinion)

 
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:blink: I have gone 23 and 28 miles after the flashing bar, but that isn't something I do with any regularity at all as I know the fuel pump uses the gas to keep itself cool.

Being the type 'A' person I am and keeping records of everything, I know that my average mpg is somewhere in the 44-45 range. I know that when I am getting after it in the hot and heavy range at various SFO gatherings and I'm in third gear 90% of the time and my rpm's are running 6,000-8,000 range trying to keep Tony and Frances in sight or trying to keep up with Renee, I'm only going to get 35.64 mpg.

Quick calculation in my brain lets me know that I will hit reserve around 220 miles in cross-country highway mode and I will hit reserve around 175 miles in adrenaline dump mode in the twisty turnies chasing Tony, Frances and Renee.

Scott

 
I know it will do 25 even in slow traffic/stoplights, etc. That was scary enough.

Question: if you run the bike dry, can you restart it? Or do you need to release air pressure somewhere on the fuel rail first?

 
The fuel level's affect on pump/motor cooling is likely a red herring. The pump assembly is vertically mounted in the tank and as the fuel level drops a larger and larger portion of the pump assembly is exposed to the air/fumes in the tank. When the fuel gauge begins blinking the fuel level float is at its lowest position.

The fuel passing up through the pump/motor may have a cooling effect as it's pumped out to the fuel rail. So as long as the pump is moving fuel it's getting cooled. If it runs dry the pump could be damaged and the motor might possibly overheat.

One might see this effect when the engine is running with the front of the fuel tank elevated, i.e., during a throttle body syncing session. The pump's fuel inlet in the bottom of the tank might be above the fuel level in the tilted-up tank. If you hear some unusual sounds coming from the pump you might guess that the pump's about to run dry.

 
I have a new 07 AE with only 490 miles on the odo. Just filled up for the second time (fully).

First fill up with 1 bar showing (not flashing), it took 4.48 gals to fill it up. That's 2.1 gal left in the tank. Traveled 172 miles at 38.4 MPG.

Second fill up (today) I was on reserve. 1 bar flash started at 200 miles on the trip meter. at F-29 after traveling 229 miles it took 5.41 gals leaving 1.2 gals left in the tank. That calc's to 42.3 MPG.

I was nervous about running out but at 42.3 MPG I could go 279 miles before running out of fuel.

 

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