Sylvie Willis
Owning a boat with a Suzuki outboard motor? You're probably aware that keeping your fuel system in good shape is essential for a smooth ride on the water. While Suzuki outboard fuel pumps are built to last, they may eventually need to be replaced due to normal wear and tear or other issues. In this article, we'll provide a step-by-step guide on how to replace the fuel pump in your Suzuki outboard engine, ensuring your boat runs reliably for years to come.
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What You'll Learn
Drain the fuel tank
To drain the fuel tank of a Suzuki outboard motor, you must first clamp off any hoses connecting the fuel tank to the outboard. This is important because, if the fuel lines are not properly clamped, fuel will siphon off and drain as you service the engine.
Next, you will need to remove the fuel from the tank. One way to do this is to use a hand-crank pump to pump the tank down as much as possible. Alternatively, you can disconnect the fuel lines, drop the tank, and then drain it.
It is important to drain your Suzuki outboard's fuel tank periodically to remove any trapped particles and contaminants that may have entered your fuel system. These particles can cause damage to your engine, so it is also recommended that you replace the fuel filter every 100 hours or annually, whichever comes first.
Additionally, keeping your fuel tank as full as possible will help to avoid condensation from entering your fuel system. However, it is important to leave a little capacity to accommodate fuel expansion if the temperature warms.
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Disconnect the fuel outlet hose
Disconnecting the fuel outlet hose is a crucial step in replacing the fuel pump on a Suzuki outboard motor. Here is a detailed guide on how to do this:
First, it is important to relieve the fuel system pressure and disconnect the battery cable for safety. This will ensure that there is no risk of fire or explosion during the process. Make sure you are wearing appropriate safety gear, such as gloves and eye protection.
Locate the fuel outlet hose – this is usually found connected to the VST (Vapor Separator Tank) and the powerhead on 90/100/115 hp (1950cc) and 100A/115A/140/140A (2044cc) models. Using a pair of wrenches, carefully loosen and detach the hose from the VST and powerhead. It is important to do this gently to avoid damaging the hose or the surrounding components.
Once the hose is disconnected, set it aside and ensure that the area is clear of any debris or tools. You may want to label the hose and any other components you remove to make reassembly easier.
If the fuel outlet hose is still connected to the VST and intake manifold, be sure to disconnect it before attempting to separate the VST from the manifold. This will ensure that you can safely and easily separate the two components without causing any damage.
Now that the fuel outlet hose is disconnected, you can proceed with the next steps of replacing the fuel pump. Remember to refer to a qualified mechanic or a detailed guide for the next steps, as replacing a fuel pump can be a complex process.
It is important to note that working on a fuel system can be dangerous, and it is always recommended to consult a professional or a detailed guide for the full procedure.
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Remove the intake manifold
To remove the intake manifold of a Suzuki outboard motor, follow these steps:
- Relieve the fuel system pressure and disconnect the battery cables from the battery.
- Remove both side covers of the outboard motor.
- Remove the flywheel cover.
- Remove the air duct by loosening two bolts.
- Remove the evaporation hose from the cylinder head cover.
- Disconnect the fuel outlet and inlet hoses from the low-pressure fuel pump.
- Loosen the clamp and place a large cloth over the end of the fuel feed. Pull the fuel feed hose from the fuel delivery pipe. Drain any excess fuel into a small container.
- Disconnect the four fuel injector connectors.
- Disconnect the high-pressure fuel pump connector.
- Remove the intake manifold.
It is important to relieve the fuel pressure and disconnect the battery before beginning any work on the intake manifold. Additionally, make sure to drain any excess fuel and disconnect all relevant hoses and connectors to avoid leakage.
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Loosen and remove mounting screws
To loosen and remove the mounting screws of your Suzuki outboard, you will need to follow these steps:
First, clamp off any hoses connecting your fuel tank to the outboard. This is important because, if the fuel lines are not properly clamped, fuel will siphon off and drain as you work on the engine.
Next, locate the mounting screws. There are normally three on most motors, but some late-model 60/70 hp/1298cc powerheads have four bolts. Loosen these screws or bolts, and then remove them.
Now that the mounting screws have been loosened and removed, you can continue with the process of replacing the fuel pump on your Suzuki outboard. Remember to consult a professional mechanic if you are unsure about any of these steps.
As a word of caution, always disconnect the negative cable of your battery before performing any maintenance work on your outboard motor. This will prevent electrical shock or accidental starting.
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Check for leaks
Checking for leaks is an important part of maintaining your Suzuki outboard fuel system. Here is a step-by-step guide to help you check for leaks when replacing the fuel pump:
Before beginning any work on your Suzuki outboard fuel system, it is essential to clamp off the hoses connecting the fuel tank to the outboard. Failing to do so will result in fuel siphoning off and draining while you service the engine.
Next, you will need to relieve the fuel system pressure and disconnect the negative battery cable. Refer to your Suzuki outboard manual for specific instructions on relieving fuel system pressure, as the process may vary depending on your model.
Once the fuel system pressure is relieved and the battery cable is disconnected, you can proceed to drain the fuel from the vapor separator tank into an approved container. This can be done using the drain screw located at the bottom of the tank and a drain hose.
Now that the fuel has been drained, you can inspect the fuel lines, fuel tank, and fuel filters for any signs of leaks or damage. Look for cracks, wear, or evidence of leakage in the fuel lines. Inspect the fuel tank for any signs of degradation or contamination. Check the fuel filters for debris or clogging, which could indicate a leak in the fuel system.
If you find any leaks or damage, they should be addressed before returning the engine to service. It is important to refer to your Suzuki outboard manual or seek the advice of a qualified marine mechanic if you are unsure about any part of the process.
After making any necessary repairs or replacements, you will need to reconnect the negative battery cable and properly pressurize the fuel system. Again, refer to your Suzuki outboard manual for specific instructions on pressurizing the fuel system.
Finally, check the system for leaks once more. If no leaks are detected, your Suzuki outboard fuel system is good to go!
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Frequently asked questions
If your engine is stalling, slowing, stopping or sputtering, this could be a sign that your fuel pump is faulty. Other signs include rapid fuel use, a rise in temperature on your gauge, and a quieter engine (the sound of the fuel pump engaging is missing).
First, check the rest of the fuel system for cracks, leaks and wear. Then, pump the primer bulb until it feels hard. If the fuel is travelling from the tank to the pump, and the outboard fuel filter is full, the fuel pump is likely not the issue. Next, remove the spark plug wire boot and the plug itself, and attach a compression gauge to the spark plug hole. Twist the throttle position wide open and either pull the rope start or turn the starter over several times. If the PSI is low (under 30), there is a compression issue. If the PSI is adequate, the fuel pump is faulty.
The diaphragm and the one-way valves.
You will need a pressure gauge. First, remove the fuel pump. Then, attach the pressure gauge hose to the outlet and seal the inlet with your thumb. If you pump the pressure gauge and the pressure releases, the inlet is faulty.
You will need two 10-24 bolts, four washers, a hose clamp, and the fuel line. Clamp and tighten the pump using the bolts and washers. Attach the fuel line to the inlet and outlet, clamping off the outlet tightly. Prime the bulb and watch the diaphragm (visible through a hole in the back of the pump). If fuel is leaking through the hole, the diaphragm is faulty.
This will depend on the model of your Suzuki outboard. You can find a range of replacement fuel pumps for Suzuki outboards online.
