Yanmar fuel gauge

[Rsmitshoek]

My yanmar fuel gauge permanently reads full. Not sure steps to determine where the problem lies

 

[knotflying]

Is this issue when at the dock as well as when underway? When underway the gauge always seems to read full because of the attitude of the boat. If your problem is also when the boat is not in motion then it sounds like a stuck float. Andrew should be able to tell you where it is and how to get to it. I would say you may have to cut a hole in the deck to get to it depending on where it is.

Let us know the end result.

 

[Osprey]

On a R27 one reaches the fuel sender through the cabin step hatch. No cutting required. It is the near the fuel turn off ball valve. The R25 is likely the same.

 

[Rsmitshoek]

It reads full both underway as well as at rest. It was working fine but when we lasted fueled up it went to full and is not showing fuel level decreasing. Suspect your conclusion is correct that float is stuck.

Andrew if you can give me some idea where to access the float that would be helpful. I will be traveling for work for a few weeks so won't be able to try but will do so as soon as I am back.

Thanks

 

[Stevan47]

Hi all: Would also be interested to know how to adust the sender on my fuel gauge so that it reads more accurately. It currently reads at about half even when the tank is full. I have an R21-EC, 2010 model. Regards

 

[daviduphoff]

Hi all: Would also be interested to know how to adust the sender on my fuel gauge so that it reads more accurately. It currently reads at about half even when the tank is full. I have an R21-EC, 2010 model. Regards

I can get up to 3/4 on my 21 when full to the top. I thought there was so much slosh from side to side that the sender had been knocked out of adjustment. I'd love to know how to adjust it too. For now I'll keep using the lift the cushion then lift the cover and take a looksie gauge.

 

[Namaste]

I have same problem with 2010 R-25. Fuel gauge reads full after many hours of running at dock and underway. Any help would be appreciated.

 

[Kenny Marrs]

On the R-25sc models the fuel tank sender is located in the aft section of the tank. If you open up the access hatch on the step the sender will be just off to the port side of the tank. All you need to do is remove the 6 screws holding the sender in place, then pull the unit out to inspect. Hope this helps.

Thanks,
-Kenny

 

[Just Dreamin']

Kenny, is this fuel sender location same for the R25 Classic?

 

[knotflying]

Just in case you did not realize it; if you have the Garmin Chartplotter using the fuel gauge and fuel flow on that unit is far more accurate than the float gauge. You need to set it up so the max capacity is in. Each time you get fuel just enter the fuel added or if you topped off hit filled tank. Your fuel remaining is almost perfect.

 

[Kenny Marrs]

No, on the R-25 the sender is located more towards the center of the tank.

 

[Boont Boater]

Thanks Knotflying. That's one lesson I hadn't got yet. I didn't reset the Garmin now it keeps warning me about low fuel. I wish that I wasn't so paranoid about spilling a drop of diesel in Washington. I don't know how to completely fill my tank.

 

[aussie]

I purchased a fuel whistle installed it,and really don't worry about spilling fuel by over filling the tank 🙂 it works great 🙂

Cheers
Peter and Ronie B

 

[knotflying]

Thanks Knotflying. That's one lesson I hadn't got yet. I didn't reset the Garmin now it keeps warning me about low fuel. I wish that I wasn't so paranoid about spilling a drop of diesel in Washington. I don't know how to completely fill my tank.

Once you set up the Garmin properly you will forget you have the Yanmar gauge. I installed the fuel whistle as well and it definitely prevents you from spilling. wear ear plugs when filling. It is loud. Sometimes people tell me I have an alarm going off.

 

[Boont Boater]

Thanks for the info.

 

[daviduphoff]

We discovered Friday night that it is more important where the pickup is in the tank than how full the gauge reads or how much much fuel you can see in the tank.

We were on out way to the fuel dock when suddenly our engine quit running. We knew we were low on fuel and had called the fuel dock to find out how late they were there and make sure they would wait for us. I jokingly said "if you don't see us in ten minutes we ran out". My next call was to ask if they could see us and if anyone could bring us some fuel. They could but there was no one at the dock with a boat. We honked our horn a couple times and waved our arms and a sailboat came to our rescue. Fortunately they were only a few hundred feet away and towed us to the fuel dock. I now have to take back many of the things I have said about what I often refer to as "blow boats". Just FYI an 8hp Yanmar can move a 26' Hunter and a 21' Ranger upriver in the Columbia at just under 1 knot. That's a long trip with as much water as there was in the river because of all the recent record rain. After we fueled up we headed back to the moorage. Going down river we actually were moving at 12MPH in our little tug at only about 3400 RPM. That's a lot of water in the river to be going that fast. I believe I will keep a 5 gallon can of diesel in the dock box to top up my tank from now on.

We have learned two things from this experience.

1) One oar is not enough. If you don't have two oars on your boat you should!

2) The pickup is about 1 1/2" above the bottom of the tank. As a matter of fact we only took about 14 gallons in an 18 gallon tank.