Charlie, hi, Thanks for your comments. My tank is also a very odd shape. My use of “measurement “ is probably a bit misleading. “Calibrate” would be better.
Simply stated, I want to avoid overfilling, and spilling diesel fuel. I have never been able to get an accurate reading from my gauge, and I have done a poor job of estimating how much fuel to add, when needed. I have a yanmar 2gm20, and, at a quart of fuel per cylinder hourly, my consumption estimate is apparently too conservative. Just haven’t been able to calibrate better. Pete W Siren Song C&C30-2 Irvington, Va Sent from my iPad > On Jun 27, 2023, at 10:44 PM, cenel...@aol.com wrote: > > Unless your tank is a rectangular cube, any measurements based on the > height of fuel in it will be approximate at best. And even then, if it is not > ‘level’ on any axis, it won’t be accurate. > > For instance, my tank’s bottom is shaped to follow the hull shape for a > secure fit. Of course, when down to 1/4 ‘full’ by a level sensor, it has much > less than 1/4 tank by volume.(The same is true for automobile fuel tanks and > this is why most tank gauges fall much faster from 1/2 full to empty than > from full to 1/2 empty.) > > There are gauge calibrators available the correct for this. AFAIK, they are > calibrated by adding fuel in known increments to an empty tank so that the > fuel gauge reflects the correct amount of fuel, not the height of the fuel. > (The calibrator is inserted in the fuel sensor wiring to change the level > sensor resistance to match the fuel volume instead of the fuel level). > > This is likely more accuracy than typically necessary for recreational > boating—adding fuel when a level gauge reaches ~ 1/4 tank will prevent the > tank from ever going empty no matter what the gauge reads. > > II am not a pilot but suspect that given the consequences of running out of > fuel at 10,000 feet, a different technology is used for airplane fuel > tanks—if not, I am sure such tanks are calibrated more accurately than most > boat fuel tanks! > > Charlie Nelson > Water Phantom > C&C 36 XL/kcb > > > Sent from the all new AOL app for iOS > > On Tuesday, June 27, 2023, 9:34 PM, Peter W. via CnC-List > <cnc-list@cnc-list.com> wrote: > > Possibly. I’ll investigate. Thanks. > > Sent from my iPad > > > On Jun 27, 2023, at 8:14 PM, Korbey Hunt via CnC-List > > <cnc-list@cnc-list.com> wrote: > > > > Can you add a sight guage? Tap holes at bottom and top of tank. Add an > > elbow fitting with clear fuel line material. > > > > -----Original Message----- > > From: Tom Buscaglia via CnC-List <cnc-list@cnc-list.com> > > Sent: Tuesday, June 27, 2023 12:52 PM > > To: Peter W. via CnC-List <cnc-list@cnc-list.com> > > Cc: Tom Buscaglia <t...@sv-alera.com> > > Subject: Stus-List Re: Accurate Fuel Tank Measurements > > > > I use my Hobbes meter. I take a picture at each fill-up and try to keep > > the tank at least 1/2 full. I have a pretty accurate picture of my per hour > > consumption. Seems close enough for me. > > > >> On 6/27/2023 11:08 AM, Peter W. via CnC-List wrote: > >> I like to keep my fuel tank as full as possible as the best way to keep > >> out water. > >> > >> Can anyone share their procedure to determine (with reasonable accuracy) > >> how much fuel their tank holds, at any given time? > >> While I have a fuel gauge, it isn't very accurate as it under-estimates > >> how much fuel is in tank (by several gallons). > >> I'm thinking of trying to use a wood or plastic dowel, but that would > >> require a "straight shot" to the tank bottom (I.e., no bends or > >> obstructions). > >> Any thoughts? > >> > >> Pete W. > >> Siren Song > >> C&C 30-2 > >> Irvington, Va > >> > >> Sent from my iPad > >> Please show your appreciation for this list and the Photo Album site and > >> help me pay the associated bills. Make a contribution at: > >> https://www.p/ > >> aypal.me%2Fstumurray&data=05%7C01%7C%7C611b354ad52e4baad33e08db77480dd > >> 3%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C638234923578751716%7CUn > >> known%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haW > >> wiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=K%2F2MOZ%2FYuWsk9GmmWQRi7lbCZYe > >> QLMP9jj1XIfyy5hA%3D&reserved=0 > >> Thanks for your help. > >> Stu > > > > -- > > (\ > > Tom Buscaglia > > SV Alera > > C&C 37+/40 > > Vashon Island WA > > (305) 409-3660 > > http://www.sv-alera.com/ > > Please show your appreciation for this list and the Photo Album site and > > help me pay the associated bills. Make a contribution at: > > https://www.paypal.me/stumurray > > Thanks for your help. > > Stu > > Please show your appreciation for this list and the Photo Album site and > > help me pay the associated bills. Make a contribution at: > > https://www.paypal.me/stumurray > > Thanks for your help. > > Stu > Please show your appreciation for this list and the Photo Album site and help > me pay the associated bills. Make a contribution at: > https://www.paypal.me/stumurray > Thanks for your help. > Stu
Please show your appreciation for this list and the Photo Album site and help me pay the associated bills. Make a contribution at: https://www.paypal.me/stumurray Thanks for your help. Stu
