‘Splain me about that suzuki gas gauge – the hull truth – boating and fishing forum gas leak east los angeles


Frankly I am a bit confused as to why I am asked to enter a gallons of fuel added when I key on the ignition. What is my c10 displaying for fuel level? Is it a measured fuel level from the sending unit? Some calculated useage from fuel used since a fill up?

I find myself always second guessing the level, not something I am used to.I’m thinking to program/calibrate it for your particular gas tank, in terms of gallons for a more accurate indication. Such as possible distance left for fuel aboard considering mpg, or what speed your cruising at. If it is for calibrating your gauge to tank size then you have to know two conditions—when empty and when full. Not all tanks hold their stated capacity correctly, in that you cant get it full for whatever reasons (on a slope while filling-trailer tongue high etc..). Having said this, you probably need to fill it up as much as possible boat level; then go from there. How to determine actual empty is run it low then get near the launch till she acts up. THEN take her and fill it up, enter your data then. All I’m stating is just a s.w.a.g of course, but it fits the reason if for no other.

It is a display that gets its data from several sources or sensors on a network, one of which is the engine. So, any information that’s available on the network can be displayed on the C10, such as a whole list of engine info (rpm, temp, voltage, trim level, etc), as well as fuel data such as fuel used since last fill, seasonal fuel used, fuel flow rate, fuel economy in mpg, fuel remaining and so on. Therefore, it is far more than just a gas gauge!

1. Fuel level, sourced from a traditional sender unit installed on the tank that is connected to the network via a sensor. This gives you a fuel level in a similar way to the traditional fuel gauges and sender units, with the level measure by a float in the tank. The electric signals from the tank sender are converted to electronic data by the sensor.

2. A calculated fuel level. The engine’s computer tells the gauge how much fuel it’s burning every millisecond and the C10 uses that data to calculate the amount of fuel burnt, and subtracts that from the fuel tank capacity, and then puts it on the display for you to see. The tank capacity has to be entered into the system when it is set up. This fuel data is then incredibly accurate, once it’s been set up and calibrated.

Your dealer should have done this for you when the engine, network and C10 display was installed. and should have walked you through how to use it. They should have set it up with the correct software on the display and the engine interface to work properly together.

1. turn the engine key to "on" (engine doesn’t have to be running) then go into the C10 setup menu, and complete the boat setup by selecting your boat/engine setup (ie 1engine with 1 tank or whatever you have) and enter the tank capacity. Note: it then assumes the tank is full! So if not full, go and fill it up before your next trip. That should stop it asking you to do it every time the key is turned on. It will also mean that the fuel remaining figure will be correct.

2. Then go into the network menu and find the data sources menu, open that, and there you will see all the data sources for the different things. For fuel level you will see either something like "Suzuki" or "global" which will mean it’s coming from the engine, or EP60 which means it’s coming from the tank sender.

As I also mentioned , there can be problems with the C10 display if it is not running the right software version that matches your engine. There have been some software updates to both the engine interface cable software and the C10 display recently and if, after you’ve done the setup pro press it is still flaky, then the SW might need to be updated.

Really, unless you’re confident with this stuff, it’s best done by a Suzuki dealer, and it’s not good enough for them to pass the ball to you on a wing and a prayer and hope it works or that you can figure it out. I would be insisting that they sort of out properly for you and make them get Suzuki support if that’s what they need.

If there is a super accurate usage info from the ecu, and a sending unit in the tank what purpose is there in entering how much fuel I add to the tank?The "sender unit" that you refer to – possibly, that is the Suzuki engine interface cable? It is the all-important cable that links the engine’s computer to the network, and thru that, to the gauge

Because the sender unit in the tank is rediculously inaccurate as it works off a float which varies like crazy when the fuel sloshes around! So the ECU ignores it as far as fuel levels are concerned. Most of us don’t bother with a tank level sender unit once we’ve got the Suzuki network set up, because it’s pretty well redundant. The only thing it’s useful for is to alter you to the possibility that someone has stolen gas from your tank – you will see the fuel level as empty or low.

It’s simple to do. You go into the C10 menu, open the fuel menu, and tell if if you’ve filled it to full or just added X amount of gas. It then adjusts its internal memory to reflect what you’ve just told it. Say your tank holds 200 gallons. You use 100 gallons. You go to the gas station but rather than fill up, you just add 50 gallons for whatever reason.

Let’s say you use the 100 gal then go to the gas station and fill’er up to full. You then fire up the C10 and in the fuel menu, select the "set to full" or equivalent option. Now, the system resets itself and knows that it’s got 200 gals left in the tank.

That’s why it is critical to do the initial setup process and to tell it how much fuel your tank holds. That way, if you tell it you’ve filled to full, it then knows to reset itself to the correct number of gallons as per the initial tank capacity setup.