Dumbazz question
Thread Starter
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Road Warrior
Joined: Mar 2009
Posts: 1,471
Likes: 9
From: Toledo, Ohio
Dumbazz question
Clear this up for me once and for all please. So when one switches over to fuel reserve, there is an internal valve that transfers to a lower section in the fuel tank in order to draw remaining fuel? I'm trying to visualize otherwise i.e. if you were to fill up at the pump with a completely empty tank, where does the fuel go, to two different compartments, or just one main tank? I've never tried or forgotten to move the petcock back to main after a being bone dry and filling up. But would you only be able to go a short distance utilizing only a reserve compartment? I know I've heard not to forget switching back to main after refueling or there just won't be any reserve, so I'm confused on the internal workings.
Cruiser
Joined: Mar 2006
Posts: 168
Likes: 16
From: MAINE
Clear this up for me once and for all please. So when one switches over to fuel reserve, there is an internal valve that transfers to a lower section in the fuel tank in order to draw remaining fuel? I'm trying to visualize otherwise i.e. if you were to fill up at the pump with a completely empty tank, where does the fuel go, to two different compartments, or just one main tank? I've never tried or forgotten to move the petcock back to main after a being bone dry and filling up. But would you only be able to go a short distance utilizing only a reserve compartment? I know I've heard not to forget switching back to main after refueling or there just won't be any reserve, so I'm confused on the internal workings.
http://w6rec.com/duane/bmw/petcock/petcock13A.jpg
Seasoned HDF Member
Joined: Apr 2011
Posts: 6,186
Likes: 2,135
From: W. Texas
Attached above the petcock there are 2 tubes standing up into the tank. The tubes are of different lengths.one is taller than the other. When the lever is in the on position the fuel is taken into the taller tube. As the fuel gets used and the level drops, the taller tube becomes uncovered and the fuel doesn't go into it. This is when we would go to reserve and the lower tube will allow the remaining fuel in. Ya won't ever have a completely dry tank but it'll be close. Not a 2 compartment tank but the petcock has 2 ways of allowing fuel through it.
Hope this helps WP
Hope this helps WP
Cruiser
Joined: Mar 2006
Posts: 168
Likes: 16
From: MAINE
Attached above the petcock there are 2 tubes standing up into the tank. The tubes are of different lengths.one is taller than the other. When the lever is in the on position the fuel is taken into the taller tube. As the fuel gets used and the level drops, the taller tube becomes uncovered and the fuel doesn't go into it. This is when we would go to reserve and the lower tube will allow the remaining fuel in. Ya won't ever have a completely dry tank but it'll be close. Not a 2 compartment tank but the petcock has 2 ways of allowing fuel through it.
Hope this helps WP
Hope this helps WP
Thread Starter
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Road Warrior
Joined: Mar 2009
Posts: 1,471
Likes: 9
From: Toledo, Ohio
ok…so when someone says you just won't have any reserve….what they really mean is there will be no warning, when you're out, you're out. Clear pic in my noggin now WP, thanks
Seasoned HDF Member
Joined: Apr 2011
Posts: 6,186
Likes: 2,135
From: W. Texas
Your Welcome Sir
WP
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Tourer
Joined: Feb 2014
Posts: 327
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From: Vine Grove KY
This thread actually was useful looking back at my sporty it didn't have the two tubes only the longer one. So hypothetical speaking you take the smaller one out you would get more out of the reserve?
Or so I was told.