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Old 05-06-2012, 05:47 AM
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Default Mercury Smartcraft fuel calibration

The manual describes a method for calibrating the fuel gauge for irregular shaped tanks .You begin with an empty tank, then add fuel 1/4 tank at a time until full .
Is there a way to do this without starting with an empty tank?
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Old 05-06-2012, 06:39 AM
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I hope you find out. and if you do follow that proceedure, I'd appreciate a PM letting me know how it worked out.

I already had 70 gals in each tank when I installed those gauges. So, I opted for listing the tanks at 100 gal and then reset them for a full fill up when I topped off my tanks.

The problem I have is the smartcraft gauge is now inaccurate. I have a fuel mangement gauge that tells me how much I have used. It is very accurate. but the smartcraft gauges will show 100% until I have used about 20 gals on each side. When it shows 60% (which should be 60 gals) My fuel management gauge is telling me I have only 40 gals left. The fuel management gauge is correct, the smartcraft gauge is not.

So, if you do the empty, 1/4, 1/2, 3/4, full routine, I'd sure like to know it it turns out more accuate on the smartcraft "fuel left" gauge.
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Old 05-06-2012, 07:02 AM
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if you are rectangular....
http://www.veradoclub.com/smf/index.php?topic=6191.0
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Old 05-06-2012, 09:00 AM
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I'll send the inquiry to Mercury to see what they say since my tank shape is irregular.
Starting with an empty tank is the main problem since none of us have an empty tank unless we run out .
It seems that there could be a way to fool the electronics since the "fuel used " system is very accurate . Maybe using the voltage readings from the sender at the quarter tank levels could be applied for calibration.
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Old 05-08-2012, 03:07 AM
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This is the response from Merc :


Thank you for contacting Mercury Marine Customer Service. The recommended procedure for calibration of the fuel tank is written in the SC1000 manual. This is the only Mercury recommended procedure. Another option is to have a dealer calibrate the tank for you or use the remaining fuel before calibration.

I was hoping for a more imaginative reply since there are lots of problem solvers that work for Mercury. I'll call them to see if there's an engineer type person who can help.
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Old 05-08-2012, 03:17 AM
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Originally Posted by fshmn View Post

So, if you do the empty, 1/4, 1/2, 3/4, full routine, I'd sure like to know it it turns out more accuate on the smartcraft "fuel left" gauge.
It is a lot more accurate!

´But you have to start from an Empty tank and a level boat!
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Old 05-08-2012, 03:20 AM
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Originally Posted by me00351 View Post
Another option is to have a dealer calibrate the tank for you

And we as a dealer do nothing else than drain the tank and refill it following the procedure described in the manual.

there´s no magic trick to do it
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Old 05-08-2012, 04:18 AM
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Quote:
Originally Posted by me00351 View Post
This is the response from Merc :



I was hoping for a more imaginative reply since there are lots of problem solvers that work for Mercury. I'll call them to see if there's an engineer type person who can help.
you are asking them to skirt their recommended procedure and tell you "on the sly" how to do it?


That won't happen.......
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Old 05-08-2012, 04:30 AM
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Yes there is a way. Our Merc Monitors were Callibrated in KW with 3/4 fuel. Problem is I didn't do it:/ My fraternity brother used to be a VP in the Smartcraft division at Merc. He sent me the gauges, then flew to KW to dive with us for a few days and did the install and calibration. He even changed the fuel gauges to show gallons and not % remaining. My friend left Mercury last year tho (great job at Livorsi).
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Old 05-08-2012, 04:59 AM
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pull your sending unit measure and mark your sending unit every 1/4 then just move it along with the calibration on the screen then put it back in. works like magic.
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Old 05-08-2012, 05:54 AM
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pull your sending unit measure and mark your sending unit every 1/4 then just move it along with the calibration on the screen then put it back in. works like magic.
And this is exactly what the thread says above from the club. In thinking about it, I don't see how it matters if it's rectangular or not because that sender only moves up the stick a certain way, and that is up-and-down. So marking it like Brad says above and I say in my thread seems to be the "trick" way to do it

And changing from percentage to actual is not actually a trick, as soon as tell it how many gallons are in the tank, it automatically switches from percent to actual, as the float on the stick can now tell what half of a certain amount is, instead of just 50% of travel.
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Old 05-08-2012, 07:35 AM
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Bradv & Glen...pulling the sending unit and marking it every 1/4 will still only work for a rectangular standard tank. If it is deeply v shaped or some other shape, the bottom quarter or half of the tank may only be a few gallons. The only way to really do it is to empty the tank dry, know how much gas the tank holds. Put in 25% at a time and set the gauge. This way, the gauge will do some linear math on the ohms reading and try to better estimate at the 1/4 percent true fill readings might be at non quarter places on the sending unit due to the odd shape of the tank. So to get it right, he still has to empty and fill the tank.
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Old 05-10-2012, 03:44 AM
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My initial call to Mercury provided me with the verbal equivalent of the owners manual. I'd like to find out how Thumperlove's friend calibrated his without emptying the tank.
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Old 05-10-2012, 04:00 AM
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Quote:
Originally Posted by me00351 View Post
My initial call to Mercury provided me with the verbal equivalent of the owners manual. I'd like to find out how Thumperlove's friend calibrated his without emptying the tank.
he pulled the senders.... and moved them manually .
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Old 05-10-2012, 05:04 AM
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I sent him a text with a copy of your question.

Last edited by thumperlove; 05-10-2012 at 05:26 AM.
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Old 05-10-2012, 05:27 AM
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Quote:
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he pulled the senders.... and moved them manually .
Exactly .....
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Old 05-10-2012, 06:07 AM
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Quote:
Originally Posted by SaltyG View Post
Bradv & Glen...pulling the sending unit and marking it every 1/4 will still only work for a rectangular standard tank. If it is deeply v shaped or some other shape, the bottom quarter or half of the tank may only be a few gallons. The only way to really do it is to empty the tank dry, know how much gas the tank holds. Put in 25% at a time and set the gauge. This way, the gauge will do some linear math on the ohms reading and try to better estimate at the 1/4 percent true fill readings might be at non quarter places on the sending unit due to the odd shape of the tank. So to get it right, he still has to empty and fill the tank.
This is correct. I have done it both ways. The Sender out of the tank trick is only good for rectangular or square tanks.
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Last edited by Flatout71; 05-10-2012 at 07:27 AM.
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Old 05-10-2012, 06:13 AM
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Well its quicker and easier than sitting at a gas station to do it the other way and its close enough. Its also going to be affected if u do it on a trailer vs in the water bc it won't be sitting the same way. And then if the boat is loaded heavier one day so the cg is off from when u did the calibration. Screw it there's no way to have it precise just sink the boat
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Old 05-10-2012, 06:15 AM
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Ok last option n2k into chartplotter and manually add fuel everytime u add fuel and it will subtract based on fuel burn and then u don't have to rely on sender
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Old 05-10-2012, 06:19 AM
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Are we trying just to get the guages calibrated to show an estimate of the % left in tank? Why not just zero the burn each time you fill up. That is the only way to really know. Our guages dont show % anymore, they show the full amount for each tank (100, 275, 100) and give an estimate of the remaining. But its not exact.
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