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Old 12-17-2012, 04:46 PM   #101
Sergio_Victory_SDL
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There have been some customer concerns of fuel gauge accuracy. The concern has been that the gauge is not accurate leading some people to believe replacement of the sending unit or gauge would be a prudent course of action. Let me explain what the characteristics of the Cross Country fuel gauge are. The fuel tank on this motorcycle holds 5.8 gallons of fuel when filled. There is more area at the top and bottom of the tank enclosure than there is in the center area of the fuel tank when looking at it from top to bottom.

This is due to three main factors.

First: there is a large tunnel that runs the length of the fuel tank front to back. The top of the tunnel is about 2.5” below the top of the tank. This means more area for fuel to be held at the top 1/3rd of the tank than from the tunnel down.

Second: the shape of the sides of the tank allows for more fuel to be held at the bottom of the tank on either side of the tunnel than in the center portion. Look at a tank from the bottom there are two large flat surfaces on the bottom of the tank and the distance from the tunnel wall to the outside of the tank is wider in this area than at mid tank height. This allow for more fuel capacity at the bottom 1/3rd of the tank than the center 1/3rd of the tank.

Third: is that the fuel pump is also mounted in the center rear of the tank in the area where the center tunnel is shallower. The pump itself takes up some volume for the center 1/3rd of the tank as well.

These three factors are the primary reasons the fuel gage moves more rapidly through the center of the float range; subsequently the gauge display as well.

This explains why some customers have noticed that the fuel gauge seems to stay at or near the full mark to tank, then notice the gauge falls more rapidly from approximately tank to tank of fuel. Some riders have felt that the low fuel light comes on too quickly as well. This is done to allow a more generous run time on low fuel level just in case you need the extra range. Victory engineered the tank to normally refill before the tank is completely dry in order to add to the service life of the fuel pump. The fuel pump is both lubricated & cooled by the fuel in the tank. Allowing the fuel pump to run dry on any vehicle with this type of system on a regular basis could shorten the service life of that vehicles fuel pump.
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Old 12-17-2012, 05:46 PM   #102
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That maybe then how come the owners manual says the low fuel light comes on when "This lamp illuminates when approximately one gallon (3.8 liters) of fuel
remains in the fuel tank." Are they contradicting what the owners manual states and if so why don't they change the manual. I think it is an excuse for a poor design. I guess that is what the "approximately" one gallon covers.
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Old 12-17-2012, 08:20 PM   #103
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Sergio, thanks for your contribution. I don't imagine that you are representing for Vic formally but I expect that what you are proposing reflects the groupthink in your corner of Victoryworld. Thing is it doesn't excuse the issue.
If as you and others argue it's a tank profile condition, there are easy and relatively cheap programming fixes that could flatten the highlows in the curve. The processor is already reading mileage and knows when the tank is full and when it is empty. That's enough parameters to report more accurately.
It doesn't have to report perfectly as long as it reports on a consistent curve that starts at full and signals for refill at a fuel level that actually has reached that stage. If I have a 200 mile range and I burned a hundred miles I expect the gauge to report half a tank. I don't give a hoot whether the float reports half a tank and the info is a passthrough or the programming approximates it based on data points. This ain't rocket scientry.
As it is my fuel gauge reports full accurately. Everything else it reports is disputable by my pad and pencil. Nope, not good enough.

The other thing is the fuel pump going kaput under low fuel conditions. Let's say that I go along that. If it is true then I do not have a 5.8 gallon fuel capacity on my Cross Country Tour. What I have is a tank with a 5.8 gallon reservoir of which 4.8 gallons (or some amount that has yet to be disclosed) is the fuel capacity and the final gallon is a cooling reservoir to keep the pump lubricated and cooled. In that case the gauge can and should report to that set of parameters and the specs on the machine should be written to reflect that. Further, Victory should slap on yet another big label on the tank warning us simpletons not to try any distance runs lest we fry our pumps. It should be a big part of the buying experience to get schooled that you will frag your fuel pump by running the tank down, or could it be that it just ain't likely?
Sorry. I'm not hanging it on you Sergio. You stepped up and that is appreciated. I'm just one of those whiny little s**ts that has nothing better to do than expect the systems, all the systems that I paid for to function acceptably.
That is not a universally shared concept I see. My life would be easier if some of these more accepting folks were my clients because the ones I am stuck with actually expect everything I provide them to work.
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Old 12-17-2012, 09:02 PM   #104
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From a R&D standpoint this is child's play. The variation in the crossectional area of the tank from full to empty doesn't mean squat. Put 1 gallon in the tank and take a measurement from the sender... add a gallon, take another measurement... keep going till full. Test ten senders in this way. If you want to do a real good job use 1/10 gallon increments and test 100 senders. Use the info to program the guage to ACCURATELY display how much fuel there is in the tank. Could probably release a software update for the bike to fix this problem, and a few others, and not charge us for it. Then we could all complain about something else.
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Old 12-17-2012, 10:12 PM   #105
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Since the tank is a strange shape a float sounds like it might not be the most accurate.
Maybe a manometer might be a better way to go. A manometer registers pressure and the pressure would not be affected by the shape of the liquid. Washing machines use a manometer to control the water level.
My fuel light comes on at more like 2 gallons left.
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Old 12-18-2012, 05:02 AM   #106
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Exactly what I was getting at Pop. They love to advertise the 5.8 gallon tank and they also love to advertise the cross bikes as long haulers. If the last 1 gallon is to cool the fuel pump (which is hogwash, Sergio just repeating what has been said before) then I guess my 800 suzuki with a 4.2 gallon tank is a long hauler as well.
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Old 12-18-2012, 10:21 AM   #107
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I don't disagree with any of you. I too feel that the fuel level metering system needs improving. If it means revising the Float system then so be it or using a different type of float system might help. There are multiple options Ma' Vic can go with. If i do hear of a fix for the tanks i'll let you all know.
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Old 12-18-2012, 10:29 AM   #108
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Quote:
Originally Posted by TNXR View Post
That maybe then how come the owners manual says the low fuel light comes on when "This lamp illuminates when approximately one gallon (3.8 liters) of fuel
remains in the fuel tank." Are they contradicting what the owners manual states and if so why don't they change the manual. I think it is an excuse for a poor design. I guess that is what the "approximately" one gallon covers.
From a personal standpoint i believe that a manufacture should be able to stand behind their product. Especially with published material that comes with a new unit.

From a Dealer standpoint i can understand why they have it set up so that we can protect the consumer from having fuel pump failures while they are out enjoying the great product that is Victory Motorcycles.

back to your original quote about the low fuel light coming on with "approximately one gallon" I'll inquire with victory and see what they say.
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Last edited by Sergio_Victory_SDL; 12-18-2012 at 11:34 AM.
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Old 01-03-2013, 03:46 PM   #109
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Default Fuel / Gas Gauge Inaccurancy

My take is that if what Sergio says is true (and I assume it is seeing that after numerous emails/phone calls to Victory from myself and my Dealer here in San Diego) did they finally fess up to this whole "2.5 gallons" left in fuel tank vice "1.0 gallon" left like the Owners Manual states when the LFL comes on.

The other point is, why didn't my Dealer know this before and after I bought my 2012 CCT?

I still have no trust in anybody from Polaris/Victory.

It is a shame that paying this kind of money for a US made bike, and with the technology we have today, there wasn't a better design/effort put forth by Victory.
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Old 01-03-2013, 04:03 PM   #110
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C'mon guys, you're overworking a non problem for which the solution is oh so simple. The fuel light goes on with 1 to 1-1/2 gallons left - that's 40 to 75 miles, depending on your fuel mileage. Note the ODO and proceed accordingly.
I too, had to learn the difference between a problem and an inconvenience, but learn it I did.
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