Replacing Scag Turf Tiger Fuel Pump: Step-By-Step Guide

The Scag Turf Tiger is a lawn mower that has been discussed on forums such as LawnSite.com, where users have sought advice on replacing the fuel pump. Scag Mower Parts offers a range of fuel pumps for different Scag models, and ScagParts.com also provides fuel system parts for Scag mowers. ScagPartsonline.com offers the electric fuel pump with SKU 483768, which is designed to fit lawn mowers specifically. This part is also available on Amazon.com for a higher price.

Check the fuel tank is full

To check if your Scag Turf Tiger fuel tank is full, there are a few methods you can use. Firstly, you can observe whether the handle of the fuel pump clicks and causes the pump to shut off—this is an indication that the tank is full. This automatic shut-off feature utilises the Venturi Effect, which creates a temporary low-pressure spot in the pipework as fuel is pumped in, causing a difference in pressure that eventually shuts off the flow of fuel when the tank is full.

Another way to check is by taking note of the amount of fuel you have put in. Over time, you will get to know your vehicle and how much fuel it typically takes. For example, you may notice that your Scag Turf Tiger's tank is usually full after putting in £70 worth of fuel.

Additionally, you can try using an external gas can to supply fuel to the engine. If the engine runs with fuel supplied from the external source, then the issue may lie with the fuel pump or the fuel tank being empty.

Finally, you can try manually checking the fuel tank. Open the fuel tank cap and use a dipstick or a similar tool to measure the fuel level inside the tank. This will give you an accurate reading of how much fuel is in the tank.

Check the shut-off valve is working

To check if the shut-off valve is working, you will need to locate it and ensure it is in the correct position. The shut-off valve on your Scag Turf Tiger is likely located near the fuel pump and carburetor.

First, find the fuel line that runs from the fuel tank to the carburetor. The shut-off valve should be positioned along this line. It is usually a small, cylindrical device with a knob or lever that can be turned or flipped to control the flow of fuel.

Once you have located the shut-off valve, make sure it is in the "on" or "open" position. This will allow fuel to flow through the valve and to the carburetor. To do this, simply turn or flip the knob or lever on the valve.

If your Scag Turf Tiger still won't pull fuel, there could be an issue with the valve itself, or another component in the fuel system. It is important to ensure that the valve is working properly, as a faulty shut-off valve can prevent fuel from reaching the engine, causing performance issues or even engine damage.

If you suspect the shut-off valve may be faulty, you can try cleaning it or replacing it with a new one. Additionally, you should also check the fuel filter and fuel lines for any signs of clogs or damage, as these can also impact fuel flow.

Check the fuel solenoid is clicking when the key is turned

To check if the fuel solenoid is clicking when the key is turned, follow these steps:

• Locate the fuel solenoid: It is usually attached to the bottom of the bowl, which is situated under the carburetor. The fuel line is typically connected to the carburetor above, supplying fuel to the bowl through the float needle valve.
• Listen for a click: Turn the key in the ignition and listen carefully for a clicking sound coming from the fuel solenoid. This indicates that the solenoid is functioning correctly.
• Observe the rocker arm: Ensure that the rocker arm is moving the lever on the fuel solenoid. The rocker arm should be activating the lever, creating a vacuum from the lifters.
• Check for suction: Place your finger on the inlet side of the fuel pump. If you don't feel any suction, it could be due to insufficient contact between the rocker arm and the lever, preventing the creation of a vacuum.
• Manually activate the solenoid: With the ignition key in the "ON" position, manually activate the solenoid by applying 12 volts directly to its terminals. You can do this by connecting a separate power source, such as a battery. If you hear a distinct click, the solenoid is engaging properly.
• Verify fuel flow: Disconnect the fuel line from the solenoid and place it in a container. Re-energize the solenoid and observe the fuel flow. If the fuel flow is strong and consistent, the solenoid is functioning correctly. However, if the fuel flow is weak, inconsistent, or non-existent, the solenoid may be faulty and requires further inspection or replacement.
• Inspect for fuel leaks: A damaged or cracked solenoid may cause fuel to leak, creating a potential fire hazard. If you notice any signs of leakage or smell fuel, have the solenoid inspected and repaired immediately.
• Test with a multimeter: Set a multimeter to the appropriate voltage range. Connect the positive lead to the solenoid terminal and the negative lead to a ground source. With the ignition key in the "ON" position, measure the voltage across the solenoid terminals. A reading close to the vehicle's battery voltage indicates that the power to the solenoid is functioning as expected.
• Check wiring connections: Inspect the wiring connections leading to the solenoid for any loose or damaged wires, frayed insulation, or signs of corrosion. Ensure all connections are secure and clean. Address any issues and retest the solenoid after fixing the wiring.

By performing these steps, you can effectively check if the fuel solenoid is clicking when the key is turned and diagnose any potential issues with the solenoid or related components.

Check the height of the gas can

To check the height of the gas can, consider the following methods:

The Float Test

Place your canister in a pot of water, ensuring that any air bubbles from underneath are removed. An empty canister will float higher, with more volume above the water's surface. A fuller canister will sink lower in the water. You can use the water line to judge the amount of fuel remaining. This method can be done anywhere with a water source and is a good alternative if you don't have access to a scale.

Using a Kitchen Scale

Weigh an empty canister, then weigh a partially used canister. By subtracting the weight of the empty canister from the weight of the partially used one, you can determine how much fuel is left.

Hot Water Gas Bottle Test

Fill a bucket with hot tap water and slowly pour it down one side of the gas bottle. A line of condensation may appear as the gas bottle level indicator. If not, wait a few seconds and then run your hand down the same side. You should feel a noticeable temperature drop at the level of the gas. The point where the temperature changes is an indicator of the gas level.

Ultrasonic Gas Bottle Gauge

An ultrasonic unit sits under the gas bottle and checks the gas level via Bluetooth, which is then displayed on a mobile phone app.

Traditional Gas Bottle Gauge

Please note that a traditional pressure gas bottle gauge will not indicate the gas level or tell you how much gas is left. This is because LPG is a liquified gas, not a compressed gas, so the pressure remains the same until all the liquid LPG is vaporized. The gauge will only move when the bottle is empty.

Other Methods

• Shake the canister and judge the amount of fuel by how much you can feel and hear moving around inside.
• Place the canister on a scale and compare it to the tare (empty) weight stamped on the neck ring.
• Listen for the fuel pump to provide enough suction to supply fuel.
• Observe the rocker arm to see if there is full movement. A collapsed lifter may be the issue.
• Check that the fuel pump is installed correctly.
• Try to gravity feed the carburetor by setting the gas can higher than the carb and starting a siphon.
• Check the valve train for any potential issues.

Remember to always handle gas carefully and follow safety guidelines when working with gas cans and pumps.

Check the fuel pump is installed correctly

To check that the fuel pump is installed correctly, first, locate the fuel pump and identify its inlet, outlet, and vent. Next, examine the fuel pump's positioning and ensure it is installed securely and correctly, following the manufacturer's instructions. Check that the fuel pump is mounted properly on the valve cover and can only go in one way.

Inspect the connections to the fuel pump, including the fuel lines and hoses, to ensure they are attached firmly and correctly. Check for any signs of damage or wear, such as cracks or leaks, and replace any faulty components.

Verify that the fuel tank is adequately filled and that the shut-off valve is functioning correctly. Ensure the fuel solenoid clicks when you turn the key. If the fuel tank is not the issue, try bypassing the tank and supplying fuel directly to the pump to identify any potential issues with the tank or fuel line.

Finally, observe the rocker arm and ensure it has full movement. Check for any signs of a collapsed lifter or other valve train issues that may impact the fuel pump's performance.

Frequently asked questions