Sylvie Willis
Outboard fuel injectors are prone to problems caused by dirty or clogged fuel. While it is possible to clean injectors yourself, it is a complicated process, and incorrect reassembly can cause engine damage. Professional fuel injector services are recommended every 300 engine hours or every three to four years. This includes ultrasonic cleaning, flow testing, and the replacement of O-rings and fuel filters. To clean injectors yourself, you can use a fuel rail canister or run a cleaning mixture from a portable gas tank. You can also remove the injectors and connect them to a hose submerged in a carburetor cleaner solution.
| Characteristics | Values |
|---|---|
| Fuel Injector Problems | Dirty, clogged, gummed-up, rusty, electrical problems |
| Fuel Injector Cleaning Solutions | Use Stabilizer, Fuel Additives, Avoid Ethanol Fuel, Service Fuel System, Use Fuel Rail Canister, Use Portable Gas Tank, Use Marine Pro, Use Carburetor Cleaner, Use Simple Green |
| Professional Fuel Injector Service | Cleaning, Calibration, Repair, Ultrasonic Cleaning, Flow Testing, O-Ring Replacement, Filter Basket Replacement |
| Fuel Injector Maintenance | Annual fuel-system maintenance, frequent boat usage, proper engine winterization, fuel treatment |
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What You'll Learn
Cleaning products and methods
While it is possible to rig a simple home-cleaning method for your outboard motor fuel injector, the best remedy for dirty injectors is to have them removed and professionally serviced. Professional fuel-injector service includes cleaning, calibration, and repair, and should be done every 300 engine hours or every three to four years.
If you are intent on a DIY cleaning method, you can try a quick-fix job on the injectors after you've removed them from the engine. To do this, connect the fuel input end to a hose that's submerged. You can also try using a fuel additive such as Sea Foam's Marine Pro. To do this, add a full can of Marine Pro to a low tank of fuel (1/4 tank or so). Then, operate the engine for at least 20 minutes before adding more fuel. You can also use a fuel rail canister or, if you can access the fuel tank lines near the engines, run a cleaning mixture from a portable gas tank.
If you are going to attempt to clean the injectors yourself, it is important to take the proper safety precautions. Wear eye protection when dealing with fuel injectors, and use a sturdy glass jar, not plastic or Styrofoam. Avoid aiming a pintle at your skin, which could result in injury as the fuel spray could penetrate the skin.
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Removing the injectors
If you are a skilled mechanic and wish to proceed, you will need to first locate the injectors. They are often found behind the air silencer and the throttle bodies. Once located, you can begin the process of removing them. This will involve disconnecting any attached hoses and wires, as well as removing any mounting hardware that holds the injectors in place. Be careful not to use any power tools during this process as there will be gas present.
Once the injectors are removed, you can either clean them yourself or send them to a professional service. If you choose to clean them yourself, you can do so by connecting the fuel input end to a hose that is submerged in a carburetor cleaner or a similar solution. You can even use Simple Green! Raise the solution container above the level of the injector so that it can gravity feed, and aim the output end into a clear jar.
Next, connect the positive and negative terminals on each injector to a 12-volt battery. This will cause the injector to "fire," spraying the cleaning solution into the jar. You can pulse the voltage by alternately connecting and disconnecting the positive jumper, which will clear the injectors in a few minutes. Be sure to mark the injectors with their locations so that you can reinstall them in the correct slots.
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Sending injectors for professional cleaning
While it is possible to clean a fuel injector yourself, it is recommended to have them professionally serviced. Fuel-injector service (cleaning, calibration and/or repair) should be done every 300 engine-run-time hours or every three to four years.
There are a number of companies that offer fuel injector cleaning services, including BrucatoFIS Inc., Injector Rx, and Fuel Injector Clinic. The cost of these services varies, but it is generally much cheaper than buying new or refurbished fuel injectors. For example, Injector Rx charges $22 per manifold injector or $30 per direct injector, while Fuel Injector Clinic charges $25 per injector.
To send your injectors for professional cleaning, you will need to fill out a form and package your injectors carefully. Make sure to include any necessary information, such as the make and model of your engine, and any specific issues you are experiencing. You will also need to provide payment information and return shipping information.
Once the company receives your injectors, they will typically perform an initial flow test to check for any issues. If your injectors are functioning properly, they will contact you to authorize the cleaning. The cleaning process usually involves an ultrasonic bath that helps to remove any dirt or debris from the injector. After the cleaning, the injectors will be tested again to ensure they are performing optimally. Finally, the company will return your serviced injectors to you via your chosen shipping method.
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Reinstalling the injectors
Before beginning the reinstallation process, ensure that you have marked the injectors with their respective locations to facilitate correct placement. It is also important to verify that the injectors are clean and free of any debris or blockages.
Firstly, carefully align the injectors with their designated slots, referring to the markings made during disassembly. This step is crucial as incorrect placement can lead to improper fuel delivery and engine issues. Secure the injectors firmly in place, ensuring they are seated correctly and no gaps or misalignments are present.
Next, proceed to reconnect all the necessary hoses and lines to the injectors. Ensure that all connections are secure and tight to prevent any leaks. Pay close attention to the fuel input end, ensuring it is properly connected to the fuel supply line.
After the injectors are securely connected, it is important to verify their functionality. Connect the positive and negative terminals of each injector to the 12-volt battery, which can be sourced from the boat. This will cause the injectors to "fire," spraying fuel into the engine.
Finally, once the injectors have been tested and are confirmed to be functioning correctly, reassemble any remaining components that were removed during the disassembly process. Ensure that all parts are securely fastened and that there are no loose connections or obstructions.
After completing these steps, your outboard motor fuel injectors should be successfully reinstalled. It is important to consult a professional or a mechanic if you encounter any issues or complications during the reinstallation process.
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Preventative measures
To prevent issues with your outboard motor fuel injector, there are several measures you can take. Firstly, it is important to keep the fuel injectors clean. This can be done by using a fuel additive such as Sta-Bil, Star Tron, ValvTect, or Gas-Shok Plus on a regular basis. These additives help prevent condensation and debris buildup, avoiding potential problems. It is recommended to double or triple the dosage of these additives before storing your boat for longer than a month.
Additionally, it is advisable to avoid using ethanol-blended fuel as it can cause fuel system degradation. While "straight gas" is an alternative, it may not be available everywhere and tends to be more expensive. Proper engine winterization and fuel treatment are critical, especially for those in northern regions. Failing to do so can result in the need for costly fuel injector cleaning and calibrating.
Another preventative measure is to service your fuel system regularly. This includes maintaining the fuel filters and replacing any degraded fuel lines. It is recommended to have professional fuel injector service, including cleaning, calibration, and repair, performed every 300 engine-run-time hours or every three to four years. However, defects in quality can shorten this service interval, so discuss any issues with your boatyard service manager or technician.
Finally, it is worth noting that fuel injectors can be difficult to access and remove, especially for those who are not already skilled mechanics. Therefore, it may be best to leave the disassembly and servicing to professionals, ensuring that your outboard motor fuel injector is properly maintained and calibrated.
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Frequently asked questions
It is recommended that you seek professional help to disassemble an outboard motor fuel injector. However, if you are intent on doing it yourself, you can start by removing the injectors from the engine. You can then clean the injectors by connecting the fuel input end to a hose that's submerged in carburetor cleaner or a similar solution.
There are several ways to clean an outboard motor fuel injector. One way is to use a product such as Marine Pro, adding a full can to a low tank of fuel and operating the engine for at least 20 minutes. Alternatively, you can use a fuel rail canister or run a cleaning mixture from a portable gas tank if you can access the fuel tank lines near the engine.
There are several signs that your outboard motor fuel injector may be dirty or clogged and in need of cleaning. These include the engine running smoothly but the watercraft struggling to reach full throttle, the engine struggling to start, and the engine idling roughly and surging on its way to full throttle.
