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Old 12-26-2015, 09:23 AM   #21
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Ya got it to work will use sight glass from now on will not do that again
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Old 12-26-2015, 09:25 AM   #22
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I have installed them on two outboard fishing boats and my previous trawler, a Camano with a 210 HP Volvo diesel. I didn't find them difficult to install especially on the gas units. Calibrated per manual and after a few fillups found the "totalizer", fuel consumed, accurate.
This Monk 36 has sight tubes on the tanks so it is easy to keep an eye on fuel available.
I haven't installed one here yet, maybe a future project.
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Old 12-26-2015, 09:50 AM   #23
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I've set up a few boats with flowscans. They work well on engines that burn LOTS of fuel. On a trawler with a B210 running hull speed, you are down around 1-3gph and that low on the scale it is a pretty coarse reading. Also with two flow meters, you are calculating gph by subtracting two numbers close to each other, and each with an accuracy. Total "inaccuracy" then can be quite large.

My preference is dipsticks or sight level gauges. In the number of tanks needed to cal the flowscans, you can determine burn rate using sticks or sight level.

Also, the cal on the flowscan can be made accurate at one power setting, that does not mean it will be accurate at some other power setting. This is a concern down at the low end of gph flow, not so much on the mid to upper end of the instruments range.

Sticks and sight tubes rule!!
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Old 12-26-2015, 11:54 AM   #24
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A stick is what I had in mind instead of using the FloScan. We will seldom run over 7 or 8 knots.
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Old 12-26-2015, 01:52 PM   #25
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But a fuel flow meter tied to your MFD can calculate your most efficient fuel burn RPM. A dipstick cannot do that.
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Old 12-26-2015, 02:19 PM   #26
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Wes, IMHO on my boat WLL rules. The desire for greater efficiency than an approximate 1.1 factor in terms of NMPG is well down my list of important issues. Just me I'm sure.
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Old 12-26-2015, 02:57 PM   #27
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Quote:
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But a fuel flow meter tied to your MFD can calculate your most efficient fuel burn RPM. A dipstick cannot do that.
Sure it can. I take a leg of a trip at 1800rp/17kts, dip tank and log hrs and nm. End of run do a dip and a calc. Repeated for 1900/18kts and 2100/21kts. Also did for 950/7.5 and 1050/8.0.

Each leg was at least a few hours to get the granularity out of the numbers. I now know burn rate for each power setting.

It took about as many tank fills as a flowscan cal. And I check it periodically. Numbers are very repeatable.

950 1.9gph
1050 2.3
1800 8
1900 9
2100 12

Those are the only speeds where the boat feels happy, so I'm not too interested in other power settings. 2000 gives me an annoying prop tip vibe, so I avoid that. Got all the numbers I need with a wooden stick. And a gps, clock and calculator!!
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Old 12-26-2015, 03:09 PM   #28
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Originally Posted by Ski in NC View Post
Sure it can. I take a leg of a trip at 1800rp/17kts, dip tank and log hrs and nm. End of run do a dip and a calc. Repeated for 1900/18kts and 2100/21kts. Also did for 950/7.5 and 1050/8.0.

Each leg was at least a few hours to get the granularity out of the numbers. I now know burn rate for each power setting.

It took about as many tank fills as a flowscan cal. And I check it periodically. Numbers are very repeatable.

950 1.9gph
1050 2.3
1800 8
1900 9
2100 12

Those are the only speeds where the boat feels happy, so I'm not too interested in other power settings. 2000 gives me an annoying prop tip vibe, so I avoid that. Got all the numbers I need with a wooden stick. And a gps, clock and calculator!!
Damn Ski, 21kts@12gph is pretty damn awesome!!!...any of those numbers are pretty badass. I am pretty much a gallon a mile up on plane.

I do need to do something though. When my 108 gallon tanks read 1/8 of a tank, they have every bit of 1/4+ in them. I don't have the cojones to run them down to "E" so I switch over too early. Having 3 identical tanks I end up with about 80 gallons of fuel when I "think" it is time to get fuel....ie all tanks reading 1/8 of a tank. I would like to burn those tanks down a little lower with peace of mind.
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Old 12-26-2015, 03:28 PM   #29
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Fuel transfer pump, make your switch overs then pump two previous tanks
empty into the last tank.
I had a single tank on my tractor-truck, changed the sending unit three times
in the first year. They all failed. Ran it on the trip meter (same daily run with
minor variations). Won't trust them in boats or major trucks.

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Old 12-26-2015, 06:53 PM   #30
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Never bothered to calibrate my FloScan. Based on engine manufacturer's theoretical information and observed usage, I merely multiply the reading by 70 percent.
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Old 12-26-2015, 07:14 PM   #31
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Which reminds me, my calibrated sight tubes never need recalibration. Even worked well on a 30' SeaRay.
Thank God I have those and a Tank Tender. It's the fuel management data that I want though.( See Baker's post #28)
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Old 12-26-2015, 09:52 PM   #32
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For determining fuel on-board, I rely on the tank tender too.


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Old 12-26-2015, 09:52 PM   #33
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Walt

Don't your Yanmars have an on engine fuel measurement calculator? Possibly they do but not hooked up to report desired data.
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