Gas Gauge Calibration Gateway Boats ( 2005 in my case )

[Stevemo14]

I installed a new Fuel Tank Sender this spring, and was wondering if there is any way to calibrate it. the Gauge is new also.

I was granted the opportunity to do a 5 Gal on the water refill yesterday, and was surprised to say the least. I went out with the gauge level just a slight bit under half, and didn't make it an hour till she quit.

I put approx 16 gallons in the boat after it was dry, and the sender was reading about 5/8's full. According to my math it should have taken 23 gallons to read this much. So is there any way to adjust this?

[James]

I don’t believe there is any way to calibrate the sender. Are you sure you installed the correct length sender. Generally the sender should be 1 inch shorter than the depth of the tank.

[Stevemo14]

I messaged Nautique Parts about which to get for my boat, https://www.nautiqueparts.com/produc...nit-9-nss-san/ is the link they sent me, and what I ordered. Looked the exact same as the one I pulled out.

I have a firend with an 03, and his reads pretty accurate, if anything he has a more than the gauge says. Just thought maybe there was an adjustment somewhere. It seems the sender is working fine, or way better than the old one which would bounce from full to empty all the time.

[James]

Probably within reason for a boat. As long as you have a few gallons in the tank to get to a marina when the gauge reads “E” you should be good to go

[Stevemo14]

I did not have a few min, It started flashing low fuel, and it started sputtering withing 5 min. I can just do the 1/2 means "have" to fill up, bu ti was hoping there was a way to make it correct.

[core-rider]

I would remove the sender and measure the depth of your tank, then compare it to the sender length to the tank and the old sender. Looks like they offer several different lengths... maybe you just have the wrong part.

[Stevemo14]

I do not have the old one anymore, I pitched it. I did put the 2 next to each other when i did the install, and they looked identical. I have messaged Nautique Parts to make sure they suggested the correct part.

[James]

I would also pull the sender and measure the depth of the tank as Core-Rider suggests. Your tank should be 10” deep for a 9” sender. While the sender is out turn the ignition to “ON” to activate the gauges without starting the engine. Remember you will have a lot of gas fumes in the bilge with the sender out. The sender is a potentiometer. If my memory serves you right the sender should read 33 ohms when the float is at the top (full) and 240 ohms at the bottom (empty). You can use a VOM to check it. Slide the float up and down the reed while observing the fuel gauge. The gauge reading should correspond to the position of the float on the reed, ie when the float is at the bottom of the reed the gauge should read “E” and you should still have 1 inch of gas left in the tank. You mentioned you have a new gauge. It it OEM? If not it may be a miss matched gauge/sender giving an incorrect reading.