Question about 2005 Harley Davidson FLSTF - FLSTFI Fat Boy

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Does 2005 Fatboy have a reserve gas tank?

Does the 2005 Fatboy have a reserve gas tank when the main gas tank runs dry?

Posted by Anonymous on


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Hi Anonymous, no but it does have a warning light that activates when fuel gets down to approximately 1/2 gallon. Have nice day.

Posted on May 27, 2015


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SOURCE: can a 2000 year fatboy gas tank fit on a 1997

Some american parts are interchangable ,but get some expert advice before you buy .

Posted on Mar 13, 2010

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SOURCE: I have a simple question. I bought a used 1998

Depends on how you view the handle. Look closely on the handle and you should see an arrow. On most petcocks the "off" position is in the middle with "on" and "res" on either side. If "off" is horizonal, then "on' should be down and "res" should be up. Depending on how you look at the lever handle. Look for the arrow.

Good Luck

Posted on Oct 29, 2010

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My bike bike runs on main tank even on low somtimes shows some missing. I think my reserve tank doesn't work.Any suggestions?

Check the reserve fuel line and the main fuel line to make sure they haven't been switched. I purchased a Suzuki Intruder and was riding all the way to reserve to check the mileage and when I ran out I couldn't start it even though I switched to reserve. Turns out that someone had the tank off to service the air cleaner and had reversed the two fuel lines so the fuel valve was running the bike on the reserve tank tube. so when I switched to the reserve position it was hooked to the taller brass tube in the tank and the gas level was already below it. The tanks just have two brass tubes, one taller than another so gas cannot be sucked below the taller tube when on main and then when switched to reserve it sucks from the shorter tube allowing the remaining gas to be used.

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Which way to turn the gas shutoff valve for reserve on 92 harley fatboy

Hi Anonymous, if you have a carbuerator the petcock/fuel valve is located on bottom rear of the left side of the fuel tank. With the long end of the lever pointing straight back the fuel valve is in the off position and no fuel will flow to the carbuerator, with it pointing straight down the valve allows fuel flow from the gas tank to the carbuerator, with it pointing straight forward it is in reserve mode and you have roughly 1/2 to 1 gallon of fuel left in the gas tank. If you are fuel injected the is a low fuel warning light either on the dash or speedometer. If you have a fuel gauge refuel before it hits empty just like your car. Good luck and have nice day.

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1 Answer

Reserve fuel tank question...

Check that fuel valve, pull out that output fuel hose, turn the valve to "reserve", if fuel flows, that means it works( fuel valve ), if no fuel flows, that valve has STUCK valve flow.

Most bike problem is in that fuel valve.

Hope that helps!

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Hello, I have an 03 600R and when lower on gas, if will shut off with any throttle at all....Normal? cuz my gas light never comes on. Is that have like an automatic reserve?

try turning the fuel tap to reserve and see if it runs, DONOT presume that because the light does not come on you are not running out on main tank. the bulb may not be working. the light is just a warning that main is running out and to switch to reserve, if the bulb has blown it cannot warn you.

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I have a 2000 yamaha r6 do i switch the fuel reserve on or off to get it started ? it has about 3 gallons of gas in it

a fuel reserve is just that...reserve incase you run low in your main tank.
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Aug 06, 2011 | 2000 Yamaha YZF-R6

1 Answer

Reserve fuel does not work. Rand tank out of gas, switched over to reserve and could not start it. Had to refill gas tank and switch back to normal then it ran. Have to only run by mileage on main tank...

With the age of your machine , you should drain the tank and remove the petcock. If you can take it apart rebuild it. If you have no reserve , either the reserve tube is broken off or the petcock is plugged. It is possible the four hole washer the seals the the lever and diverts the fuel is damaged , worn , or broken. Depending on the over all condition of the petcock replacement of the entire unit may be the best option. At any rate an new fuel petcock would definitely fix this issue. Rebuilding your old petcock is only an option if all the parts you need for it are available.

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1 Answer

How find out reserv or main at petrol tank

Do you have a petcock on the bottom of the gas tank? If so, if you have a "reserve" the petcock will have three positions, off, regular and reserve. If you only have a two position petcock you have no reserve function. Petcocks work by taking the gas in the petcock tube higher up in the gas level, once the gas level drop below a certain level on the gas tank pickup tube, the petcock has to be switched to reserve where the tube picks up gas at a lower level. Hope this is not too confusing.

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When you have it on main there is a little pipe that sticks higher up into the gas tank and once the gas get down below the top of the pipe it will start to make the engine sputter and you have to flip the lever over to reserve so the rest of the gas can be used. But once you have used up all the gas in the tank you will be empty. So when ever you flip it to reserve you will only have about a 1/2 gallon of gas left to get you to a gas station to get it filled back up. No there is not a separate tank in side the main tank.

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1 Answer


It’s a Main/Reserve fuel valve. Its purpose is to select which of two tubes the fuel pump uses to get fuel from the fuel tank. One of the tubes is at the bottom of the tank; the other is about an inch higher. The normal “On” position gets fuel from the tube with the higher opening. When it runs dry you switch to “Reserve” which gets that last gallon or so from the bottom of the tank. That gives you enough range to make it to the next gas station for a fill-up. ,

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