Ameer Randolph
Keeping your Evinrude fuel injectors clean is essential for optimal performance and fuel efficiency, especially during the busy summer boating season. Dirty injectors can cause various engine problems, from rough idling to power loss under full throttle. While there are DIY methods for cleaning injectors, it is recommended to seek professional services for more comprehensive and safe results. This involves removing the injectors and sending them for cleaning and testing, ensuring your Evinrude engine runs smoothly and efficiently.
| Characteristics | Values |
|---|---|
| Fuel injector service | Recommended once a year or every 100 hours of use |
| Fuel-system service | Should include all fuel filters and any degraded fuel line replacement |
| Professional fuel-injector service | Should be done every 300 engine hours or every three to four years |
| Fuel injector problems | Engine won't start, idles roughly, and surges through midrange and full throttle |
| Fuel spray pattern | Should be a fine mist; dirty injectors make the spray pattern intermittent and splotchy |
| Fuel injector cleaning | Can be done at home or by a professional service |
| Fuel injector additive | Some people recommend adding an additive to the gasoline to unclog the restriction |
| Fuel injector cleaning at home | Requires removing the injectors from the engine, connecting the fuel input end to a hose with a carburetor cleaner, and connecting the positive and negative terminals to a 12-volt battery |
| Fuel injector replacement | May be necessary if the injector is not working well or is damaged |
| Fuel injector maintenance | Proper engine winterization and fuel treatment are critical to prevent corrosion and expensive cleaning and calibrating |
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What You'll Learn
Fuel injector additive
Fuel injectors can become clogged with grime from exhaust gas recirculation (EGR) and algae in the fuel tank. To keep this to a minimum, they need to be cleaned regularly with products designed for this purpose.
To use a fuel injector additive, simply pour the contents into the fuel tank and drive normally. It is recommended to perform fuel injector cleaning every 3,000 miles to maintain optimal engine efficiency.
Some people recommend using a high concentration of the additive in a small tank to clean the fuel injectors. For example, one can of additive per gallon of gas. This method can help to unclog restrictions in the fuel injectors.
In addition to injector cleaning additives, stabilizers, and carbon-reducing additives are also recommended to maintain the health of your engine.
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Cleaning with carburetor cleaner
Carburetor cleaner can be used to clean Evinrude fuel injectors, but it is important to exercise caution. Firstly, it is recommended to use carburetor cleaner on disassembled fuel system components. This is because spraying carburetor cleaner down the carburetor throats with the engine running can potentially damage your engine by removing the oil deposited by the fuel/oiling system.
When using carburetor cleaner on disassembled components, it can be effective at removing gum and varnish from carburetors, VSTs, and some fuel injectors. Carburetor cleaner is typically available in an aerosol can, which can be sprayed onto the affected areas. After spraying, gently wipe away the cleaner with a clean, lint-free rag.
It is important to note that carburetor cleaner should not be used to soak fuel injectors, as it can damage certain components. Specifically, carburetor cleaner can eat away at the o-rings and brittle any plastic parts. Therefore, it is recommended to only use carburetor cleaner on metal fuel injectors and to avoid soaking them in the cleaner.
To clean Evinrude fuel injectors with carburetor cleaner effectively and safely, follow these steps:
- Disassemble the fuel system components, including the fuel injectors.
- Spray the carburetor cleaner onto the affected areas of the fuel injectors.
- Gently wipe away the cleaner with a clean, lint-free rag.
- Reassemble the fuel system components properly, ensuring all connections are secure.
It is important to consult a professional mechanic if you are unsure about the process or have no experience with auto maintenance. Improper reassembly of the fuel system can lead to issues such as a rough-running engine, fuel leaks, and potential fire hazards.
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Annual fuel-system maintenance
Step 1: Winterization and Fuel Treatment
Before the winter season, it is crucial to perform proper engine winterization and fuel treatment. This involves stabilizing the fuel with the correct treatment to prevent evaporation and varnishing. Alcohol in the fuel can have corrosive effects on hoses, filters, O-rings, and fuel pumps, leading to disintegration and debris accumulation in the injectors. By winterizing your engine and using the appropriate fuel treatment, you can prevent these issues and maintain the integrity of your fuel system.
Step 2: Fuel Filter Replacement
As part of your annual maintenance, it is recommended to replace all fuel filters. Fuel filters play a vital role in preventing debris and contaminants from reaching the injectors. Over time, these filters can become clogged, reducing fuel flow and affecting engine performance. Regular replacement ensures that your fuel system remains in optimal condition.
Step 3: Fuel Injector Cleaning or Replacement
Fuel injectors are susceptible to becoming dirty or clogged over time. This can lead to engine problems such as rough idling, surging, and reduced power. While there are DIY methods for cleaning injectors, it is generally recommended to seek professional cleaning and calibration services. These services have the necessary equipment and expertise to thoroughly clean and calibrate the injectors, ensuring they function correctly.
If your Evinrude E-TEC injectors are severely clogged or damaged, replacement may be necessary. E-TEC injectors cannot be fully disassembled for cleaning, so in some cases, a new injector may be the best solution.
Step 4: Fuel Pump Inspection
Fuel pumps are another critical component of the fuel system. It is important to monitor their performance and keep them well-maintained. If you notice any signs of fuel pump issues, such as a decrease in fuel pressure or unusual engine behaviour, have them inspected and replaced if necessary.
Step 5: Use Fuel Injector Additives
Consider using fuel injector additives as a preventative measure to keep your injectors clean. Additives such as Seafoam, Techron, or Berryman's can be added to the fuel tank to help prevent clogging and maintain the performance of your injectors. Always research the specific recommendations for your engine before using any additive.
By following these annual fuel-system maintenance steps, you can help ensure the reliability and performance of your Evinrude engine. Regular maintenance not only keeps your fuel system in optimal condition but also helps prevent costly repairs and unexpected breakdowns.
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Professional fuel-injector service
Evinrude E-TEC injectors are a welded assembly and cannot be taken apart for cleaning or servicing. However, the aluminium housing can be removed to access the fine screens that can be cleaned.
- First, the injectors are Ohm tested to determine their current resistance capacity. Injectors that pass the test are externally cleaned and inspected for visible external damage.
- In the second step, viable injectors are loaded into a computer-controlled testing machine and tested for reluctance. During the testing, the injectors are pressurised to +/- 45 psi / 3 bar and checked for leaks.
- The injectors are then pulsed at various rates to ensure complete results.
- After an ultrasonic cleansing, a high-pressure back-flush is performed to remove any remaining particles and flush out the cleaning fluids.
- The injectors are then retested for leaks, spray pattern, and flow, and the results are recorded.
- New filter baskets, O-rings, and pintle caps are installed if needed.
- Finally, the injectors are lubricated and placed in sealed poly bags. A comprehensive test report is prepared and returned with the injectors.
The company also offers an expedited or next-day service for $30.00 per MPI injector or $35.00 per direct injector, with a minimum charge of $60.00.
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Engine winterization
Winterizing your Evinrude engine is essential to protect it from freezing temperatures and corrosion during the winter months. Here is a detailed guide to help you through the process:
One of the most important steps in winterizing your Evinrude engine is to address the fuel system. Modern fuel often contains ethanol, which, while suitable for automotive engines, can cause issues in smaller engines like Evinrude's. Ethanol breaks down much faster than petroleum-based fuel, leaving behind cellulose residue that clogs fuel lines, intakes, and injectors. To prevent this, use a high-quality marine-specific fuel stabilizer such as the Evinrude 2+4 Fuel Stabilizer. Pour the stabilizer into your fuel tank and run the motor with a hose attached to your water pump until the stabilized fuel circulates throughout the engine.
Fogging:
Fogging is another critical step in the winterization process, helping to prevent freezing and corrosion. It involves adding a thin coating of oil to the engine's interior parts. For older two-stroke Evinrude motors, use canned fogging oil, spraying it into the carburetors as the motor idles out of fuel. Newer Evinrude E-TEC motors have a built-in fogging feature, automatically adding the necessary layer of oil through digital control.
Fuel Injector Maintenance:
If your Evinrude engine is experiencing performance issues, dirty fuel injectors could be the culprit. While E-TEC injectors cannot be fully disassembled for cleaning, you can remove the aluminum housing to access and clean the fine screens. Additionally, fuel injector additives can be used to unclog any restrictions. Always exercise caution when using fuel injection cleaners, as incorrect usage can lead to severe engine damage.
Other Considerations:
Before storing your Evinrude engine for the winter, ensure you have addressed any fuel delivery problems. Slowly pull back on the throttle, and if the engine starts to make power or run smoothly, maintain that throttle position to avoid engine failure. Once ashore, remove the injectors and send them for professional cleaning. Consider replacing all fuel filters in the fuel system. Additionally, check the in-line filters between the pump and fuel pressure gauge, replacing them if necessary.
By following these steps, you can effectively winterize your Evinrude engine, ensuring it remains in optimal condition during the cold months.
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Frequently asked questions
If your engine won't start with a quick key flick, idles roughly, and surges through midrange and full throttle, your fuel injectors are likely dirty and in need of cleaning.
It is recommended to have fuel-system service once a year or every 100 hours of use. Professional fuel-injector service should be done every 300 engine hours or every three to four years.
Yes, you can clean them yourself, but it is recommended to send them to a professional. If you want to clean them yourself, you can try a fuel injector additive in the gasoline or a home-cleaning method using a hose submerged in carburetor cleaner.
First, remove the injectors from the engine. Then, connect the fuel input end to a hose that's submerged in carburetor cleaner. Raise the solution container above the level of the injector and aim the output end into a clear jar. Connect the positive and negative terminals on each injector to a 12-volt battery. The injector will then spray the cleaning solution into the jar.
The cost of cleaning Evinrude fuel injectors can vary depending on the service provider and the extent of the cleaning required. Some companies offer affordable outboard fuel injector cleaning and reconditioning services. The parts and labor for replacing an Evinrude fuel injector can cost around $695.
