Replacing The Fuel Line On John Deere Gx 335: A Step-By-Step Guide

The John Deere GX 335 is a lawn tractor with an air-cooled gas engine. If you are experiencing issues with the fuel line, it is possible to replace it. The fuel line for this model is the John Deere Original Equipment Fuel Line #AM122215. This fuel line is compatible with several John Deere riding mower models, including the GX 335.

Before replacing the fuel line, it is recommended to check other components such as the gas filter, fuel pump, and carburetor to ensure they are functioning correctly.

Check the fuel pump

To check the fuel pump on your John Deere GX335, you'll need to inspect the pump's sensor, which regulates fuel flow into the carburetor. No electronic tools are required for this process, and it should take around 15 minutes. Here's a step-by-step guide:

• Drive your tractor onto a flat surface.
• Ensure there is gas in the tank. If not, pour some gas into the tank.
• Place a pan underneath the engine to catch any spilled fuel.
• Open the hood and locate the rubber fuel line on the side of the engine. Follow this line until it goes into the carburetor.
• Unplug the pins and wiring on the fuel line.
• Connect one alligator clip to the positive terminal (+) of the battery. Connect the other clip to one of the places where the wires were connected on the fuel line.
• Connect the second alligator clip from the negative terminal (-) of the battery to the other wire connection on the fuel line.
• Drain the fuel into the pan.
• Observe the fuel coming out of the line. If the fuel is pumping out very fast, the pump is working correctly. If it is just trickling out, the pump needs to be replaced.

This process will help you determine if the fuel pump is functioning properly and whether it needs to be replaced.

In addition to checking the fuel pump, here are some general tips for replacing the fuel line on your John Deere GX335:

• Ensure you have the correct replacement parts for your specific model.
• Refer to a repair manual or seek guidance from a qualified technician if you're unsure about any steps.
• Exercise caution when working with fuel to avoid spills and injuries.
• Ensure the engine is cool before starting any work.
• Be cautious when handling sharp objects or tools.

Check the pulse line from the crankcase to the fuel pump

To check the pulse line from the crankcase to the fuel pump on a John Deere GX 335, start by locating the hose from the crankcase. This is the pulse line that needs to be checked.

Visually inspect the hose for any signs of damage, cracks, leaks, or blockages. If the hose looks damaged or worn, it will need to be replaced. If the hose looks intact, proceed to the next step.

Next, you will need to check the function of the pulse line. To do this, you can use a pulse line tester or a pressure gauge to ensure that the pulse line is functioning correctly and providing the correct pressure to the fuel pump.

Connect the tester or gauge to the pulse line and start the engine. Observe the readings on the tester or gauge. The pulse line should be providing a steady and consistent pressure to the fuel pump. If the pressure fluctuates or is inconsistent, there may be an issue with the pulse line or the fuel pump.

If the pulse line tester or pressure gauge indicates an issue, further diagnostics may be required. This could include checking the crankcase ventilation system for blockages or restrictions, as well as inspecting the fuel pump for proper operation.

It is important to note that working on fuel systems can be dangerous due to the flammable nature of fuel. Always exercise extreme caution and refer to the appropriate service manual or seek professional assistance if needed.

Check the springs on the carburettor/governor linkage

To check the springs on the carburettor/governor linkage of your John Deere GX 335, first make sure the engine is off. Check the springs for any slack, ensuring that they are not flopping loose. You can take out any slack by bending the hook, but be careful not to add tension to the springs.

Check the choke

To check the choke on your John Deere GX335, you will need to refer to the parts lookup for the GX335 model. The choke is listed under the 'Throttle & Choke Controls' section, with the part number AM123513.

Checking the choke may involve disassembling the carburettor, as the choke spring is located within the carburettor. The choke spring can be accessed by removing the carburettor plate and shaft. If the choke is not functioning correctly, it may be due to a faulty choke spring or a deformed plastic choke shaft.

To fix a faulty choke, you can try installing a heavier choke return spring with the part number MIU13934, which is available from John Deere dealers. This solution is detailed in a technical bulletin that your dealer should be able to access.

Alternatively, you can attempt to fix a deformed plastic choke shaft by polishing it before reassembling the carburettor. This solution may be more challenging and require further disassembly of the carburettor.

Check the carburettor

To check the carburettor on your John Deere GX 335, you'll first need to locate it. The carburettor is a small, metal device, usually shaped like a box or cylinder, located close to the air filter and the engine. It's secured with a few screws or bolts, and you can also find it by tracing the fuel line from the gas to the engine.

Once you've located the carburettor, you can check for any signs of dirt or restriction. Some common signs of a dirty or restricted carburettor include:

• The engine starts but stalls during use.
• Black smoke coming from the muffler.
• A significant increase in fuel consumption.
• The engine runs rough during regular use.

If you notice any of these issues, it's likely that your carburettor needs cleaning or repair.

Before cleaning or removing the carburettor for inspection, make sure to disconnect or remove the spark plug to prevent accidental starting. Also, always refer to your owner's manual for specific instructions and safety precautions.

Frequently asked questions