Sylvie Willis
The Kubota ZD1211 is a lawnmower designed for professional use, with a powerful diesel engine. It is equipped with dual fuel tanks, and users have reported issues with the fuel being drawn from only one tank, usually the right-hand tank, while the other remains full. While there is no fuel valve or tank selector, there is a shut-off valve at the bottom of each tank, and the engine draws fuel from whichever tank runs dry. To switch tanks, users recommend drawing from one tank and then switching to the other before it reaches empty.
| Characteristics | Values |
|---|---|
| Fuel tank equalization | The engine draws fuel equally from both tanks. |
| Fuel gauge | Only shows the right tank. |
| Fuel switch | No switch, lever, or valve to manually switch between tanks. |
| Fuel tank venting | A pipe with a vent line connects the two tanks to allow fuel to flow from one tank to the other. |
| Fuel filter | A clogged fuel filter can cause the engine to draw fuel from only one tank. |
| Fuel shut-off valve | Located at the bottom of each tank, ahead of the back wheel. |
| Fuel valve | Ensure the fuel valve is turned on. |
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What You'll Learn
The Kubota ZD1211 mower has dual fuel tanks
There is no need to manually switch between the tanks as there is a vent line that runs between them, allowing fuel to flow from one side to the other. However, there is a shut-off valve at the bottom of each tank, which can be used to shut off the empty tank and get fuel flowing from the full tank. It is important to ensure that the fuel tank has enough gasoline and that the fuel valve is turned on.
The mower also has a fuel indicator, which shows the fuel level in both tanks. Other indicators include battery voltage, meter, coolant temperature, and warning lights for various issues such as low fuel or overheating. The ZD1211 is designed with a low centre of gravity, providing improved stability and maneuverability. It also has safety features such as an integrated roll bar and a seatbelt.
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The tanks do not equalize well
The Kubota ZD1211 has two fuel tanks, and the engine draws fuel from both tanks equally. However, there is no mechanism for the tanks to equalize fuel levels. This means that if one tank runs dry, the engine will continue to run, drawing fuel from the other tank. This can be an issue if the operator is not monitoring fuel levels, as the engine will shut down when both tanks are empty, which could be dangerous if it happens on a steep hill.
To avoid this, it is recommended to draw fuel from one tank and then switch to the other before the first tank reaches empty. This can be done by shutting off the valve on the empty tank and opening the valve on the full tank. It is also important to purge any air from the system, as this can cause the engine to shut down.
Some users have reported that their ZD1211 has run into issues with fuel equalization, with one tank being drained while the other remains full. This can be caused by a blockage in the cross-over line, or a stuck check valve. A loose or plugged fuel cap can also cause issues with fuel equalization, as it can create a vacuum in the tank, preventing fuel from flowing properly.
Overall, while the Kubota ZD1211's fuel tanks do not equalize well, there are steps that can be taken to ensure that the engine draws fuel evenly from both tanks and to troubleshoot any issues that may arise.
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Guidance from Kubota is to draw from one tank then the other
Kubota's guidance on the ZD1211 fuel tank equalization is to draw from one tank and then the other. This works best if you start with the right tank and switch to the left tank before the right one reaches empty. This is because the gauge only shows the right tank, and the grass will likely be cut before the second tank runs out.
The upper hose serves to keep both tanks equally vented. The engine must draw equally from both tanks, with no other type of equalization. There is a shut-off valve at the bottom of each tank, and the fuel can be manually switched over.
Some users have reported issues with the mower shutting down when one tank empties out, which can be resolved by shutting off the empty tank and getting fuel flowing from the full tank.
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There is no fuel valve or tank selector on the ZD1211
The Kubota ZD1211 does not have a fuel valve or tank selector. This is in contrast to the ZD300, which did have a fuel shutoff and tank selector, which were poorly designed from a consumer standpoint.
The ZD1211 has a shut-off valve at the bottom of each tank, located just ahead of the back wheel. If one tank runs dry, the engine will continue to draw fuel from the full tank. To get fuel flowing from the full tank, shut off the empty tank and purge the air.
There are check valves on each tank line at the filters, so the engine draws equally from both tanks, with no other type of equalization. The upper hose serves to keep both tanks equally vented.
If the tanks are not equalizing, it may be that the left filter is more clogged than the right, causing fuel to take the path of least resistance. Replacing the tank fuel filters may fix this problem.
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The engine may suck in air from the right tank
Another possible reason for the engine sucking in air from the right tank is a stuck check valve. Check valves are installed on each of the lines coming out of the fuel tanks to prevent fuel from flowing from the high side to the low side when the mower is used on a hillside. If one of these check valves becomes stuck, it could prevent fuel from flowing out of the left tank, causing the engine to draw fuel from the right tank until it is empty.
Additionally, the issue could be related to the fuel filters. If the fuel filter on the left tank becomes clogged, the engine may draw fuel from the right tank only, as fuel will take the path of least resistance. Replacing the fuel filters or running a single filter between the tee and the engine may help ensure that fuel is drawn evenly from both tanks.
It is also important to note that the fuel tanks on the Kubota ZD1211 do not equalize well. This means that both tanks need to be equally full for the engine to draw fuel evenly from both sides. If one tank is more full than the other, the engine will draw more fuel from that tank, which can lead to an uneven fuel level and the engine sucking in air when that tank runs dry.
Finally, there is a shut-off valve at the bottom of each fuel tank, just ahead of the back wheel. If the shut-off valve on the left tank is accidentally turned off, the engine will only draw fuel from the right tank, leading to an uneven fuel level and the potential for air to be sucked into the engine when the right tank runs dry.
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Frequently asked questions
Kubota's guidance is to draw fuel from one tank and then the other. This works best if you draw from the right tank and switch before it reaches empty, then use the left tank. There is no switch or lever to do this, but there is a shut-off valve at the bottom of each tank.
The gauge only shows the right tank, so you will need to keep an eye on the left tank. The mower will operate fine when drawing from just one tank, but it is best to switch before the tank reaches empty.
This could be due to a blockage in the cross-over line. Check that the fuel valve is turned on, and that there is no debris in the fuel select switch.
Shut off the empty tank and get fuel flowing from the full tank. Then, purge the air and all should be fine.
