Fuel tank "burping"? And does a DK Custom tank lift affect it?
#21
Told you your tank burps. It only matters for what you consider full and where you think you are adding to. No manufacturer says to fill any tank to the top to allow room for expansion. All I do is fill full, wiggle it a time or two, done. That's usually before a ride not after.
Finally did tank on the trike... 32 mpg normal driving. Full tank => empty tank. Do that over several tanks, and differences on what you think is full averages out. Full tank, to empty tank. Miles/gas in. All the dinky low milage tests are not telling you anything accurate. Every error in filling to different level at different temp with small amounts is magnified.
Do several full tanks, burp it, don't burp it, but do it the same... then see how accurate your measurement is to the computer... You can make your own correction factor.... Or just use you trip computer for distances to turns or route, and not trip on what it tells you mpg is.
Finally did tank on the trike... 32 mpg normal driving. Full tank => empty tank. Do that over several tanks, and differences on what you think is full averages out. Full tank, to empty tank. Miles/gas in. All the dinky low milage tests are not telling you anything accurate. Every error in filling to different level at different temp with small amounts is magnified.
Do several full tanks, burp it, don't burp it, but do it the same... then see how accurate your measurement is to the computer... You can make your own correction factor.... Or just use you trip computer for distances to turns or route, and not trip on what it tells you mpg is.
Last edited by Powermankw; Today at 05:59 PM.
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John Harper (Today)
#22
Told you your tank burps. It only matters for what you consider full and where you think you are adding to. No manufacturer says to fill any tank to the top to allow room for expansion. All I do is fill full, wiggle it a time or two, done. That's usually before a ride not after.
Finally did tank on the trike... 32 mpg normal driving. Full tank => empty tank. Do that over several tanks, and differences on what you think is full averages out. Full tank, to empty tank. Miles/gas in. All the dinky low milage tests are not telling you anything accurate. Every error in filling to different level at different temp with small amounts is magnified.
Do several full tanks, burp it, don't burp it, but do it the same... then see how accurate your measurement is to the computer... You can make your own correction factor.... Or just use you trip computer for distances to turns or route, and not trip on what it tells you mpg is.
Finally did tank on the trike... 32 mpg normal driving. Full tank => empty tank. Do that over several tanks, and differences on what you think is full averages out. Full tank, to empty tank. Miles/gas in. All the dinky low milage tests are not telling you anything accurate. Every error in filling to different level at different temp with small amounts is magnified.
Do several full tanks, burp it, don't burp it, but do it the same... then see how accurate your measurement is to the computer... You can make your own correction factor.... Or just use you trip computer for distances to turns or route, and not trip on what it tells you mpg is.
- simply starting with a full fuel tank (filled via whatever method you want to use, as long as you are reasonably consistent on the FIRST and LAST fill),
- zeroing the trip info screen by choosing a new far-away destination that you don't intend to actually visit
- refilling the tank whenever you feel like doing so (if you are interested in ONLY getting the overall MPG for the entire test duration)
- when ready to stop the longterm test, fill up PRECISELY the same way you filled at the start of the test (if you want best possible accuracy)
- Calculate the MPG based on the TOTAL gallons you pit into the tank after starting the test
- Compare that to the MPG claimed by the HD Trip Info Screen, and decide which one you want to believe if they are different.
The flaw in that plan though is that it only gives you your average MPG for the entire test period. No breakdown by speed, which is important if your speeds and traffic situaitons during the tets period are not representative of your normal, OR if your normal is a mix of city, suburban and highway, but you are planning a long multi-day hgihway trip with minimal city or subrban riding, and at speeds that are not the same as during your test. It alos does not tell you how far you can go before running out of gas if you find yourself on a segment of highway you are not familiar with that has few gas stations.
I was hoping to get more detailed info that I could use to do some long trip planning, and to make speed versus MPG decisions.
Jim G
#23
#24
Starting in 2014 Harley began using a different filler neck on the Touring and Trike Models. Not sure about Softails, Dynas (RIP) and Sportsters (RIP).
With the change of the filler neck, the fuel gauges are much more accurate, or should I say, less inaccurate than they were before 2014.
The consequence of changing this is that the bike or trike needs to be rocked side to side to let trapped air escape and more fuel to go in. This applies, whether you have a tank lift or not.
On my Trike I normally can fit over 1/4 gallon more in by moving it side to side and letting that trapped air escape, WITHOUT it be overfilled.
Kevin
With the change of the filler neck, the fuel gauges are much more accurate, or should I say, less inaccurate than they were before 2014.
The consequence of changing this is that the bike or trike needs to be rocked side to side to let trapped air escape and more fuel to go in. This applies, whether you have a tank lift or not.
On my Trike I normally can fit over 1/4 gallon more in by moving it side to side and letting that trapped air escape, WITHOUT it be overfilled.
Kevin
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#25
Good points. How much "unused' vaolume is required? Is it too high if the fuel touches the tips of the teeth in the toothed ring inside the filler? If so, is there another easy-to-see reference point in the neck of the tnak?
The ideal reference point would be one that also ensures that there is no place in the tnak's shape that can create an air bubble that artificially inflates the apparent height of the fuel level. But it also has to be visible when filling the tank at the gas station.
Jim G
The ideal reference point would be one that also ensures that there is no place in the tnak's shape that can create an air bubble that artificially inflates the apparent height of the fuel level. But it also has to be visible when filling the tank at the gas station.
Jim G
Kevin
#26
#27
Jim G
#28
Starting in 2014 Harley began using a different filler neck on the Touring and Trike Models. Not sure about Softails, Dynas (RIP) and Sportsters (RIP).
With the change of the filler neck, the fuel gauges are much more accurate, or should I say, less inaccurate than they were before 2014.
The consequence of changing this is that the bike or trike needs to be rocked side to side to let trapped air escape and more fuel to go in. This applies, whether you have a tank lift or not.
On my Trike I normally can fit over 1/4 gallon more in by moving it side to side and letting that trapped air escape, WITHOUT it be overfilled.
Kevin
With the change of the filler neck, the fuel gauges are much more accurate, or should I say, less inaccurate than they were before 2014.
The consequence of changing this is that the bike or trike needs to be rocked side to side to let trapped air escape and more fuel to go in. This applies, whether you have a tank lift or not.
On my Trike I normally can fit over 1/4 gallon more in by moving it side to side and letting that trapped air escape, WITHOUT it be overfilled.
Kevin
Jim G
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