Trimmer Fuel Line: Why You Should Replace With Echo

The fuel line grommet on an Echo Trimmer creates a seal between the fuel lines and the fuel tank. Over time, the grommet will deteriorate and crack due to its rubber composition, leading to fuel leakage from the top of the tank. This issue can be resolved by replacing the grommet, which is a straightforward process that does not require any specialised skills. The ethanol in the fuel will also eventually cause the fuel lines and purge bulb to crack and the fuel tank grommet to expand and become improperly sealed. This repair guide will cover the steps to replace the fuel lines, grommet, fuel filter, ventilator, purge bulb, and gas cap vent gasket in an Echo Trimmer.

The fuel line grommet deteriorates over time and needs replacing

The fuel line grommet is a rubber seal that connects the fuel lines to the fuel tank. Over time, the grommet will deteriorate and crack due to the ethanol in the fuel, causing the seal to break and fuel to leak from the top of the tank. This repair is necessary at least once during the lifetime of the trimmer.

To replace the fuel line grommet, first remove the air cleaner assembly by loosening the thumb screw, removing the air cleaner lid, and taking out the air filter. Drain any excess fuel from the tank before servicing the unit. Then, remove the fuel cap, fuel filter, and fuel lines from the grommet. Use a screwdriver to carefully pry the grommet out of the fuel tank.

Before installing the new grommet, lightly coat its edge with 2-cycle engine oil to lubricate it and make installation easier. Press the new grommet into the ridge on the fuel tank, using a screwdriver if needed. Reinstall the fuel lines, ensuring that any existing tapered ends match the new grommet. Cut similar angles on the remaining fuel lines using wire cutters or scissors if necessary. Lightly coat the ends of the fuel lines with 2-cycle engine oil before inserting them into the grommet.

Finally, reinstall the fuel filter, fuel cap, and air filter assembly. Secure the air filter lid with the thumbscrew.

Ethanol in the fuel causes cracking in the fuel lines

Ethanol in the fuel can cause cracking in the fuel lines of an Echo trimmer. This is because ethanol is a highly corrosive substance when in contact with certain materials, including rubber compounds and the zinc and aluminium alloys used in carburetors. As an alcohol, ethanol also dries out rubber components, leading to cracking and brittle fuel lines.

In addition, ethanol is hygroscopic, meaning it attracts water. When water enters fuel containers during filling, it forms a chemical mix with the ethanol that causes corrosion of internal parts. As the fuel level in a tank or container drops, water condenses on the cool surfaces of the vessel, then drips down into the fuel, where the ethanol absorbs it. This water-ethanol mix has a shelf life of about one month, compared to three or four months for gasoline, and should be bought in small quantities to avoid corrosion.

The use of ethanol in fuel has been linked to irreparable harm to gasoline-fuelled internal combustion engines, and it has been prohibited for use in small engines and power equipment. To avoid the negative effects of ethanol, ethanol-free fuel can be purchased at most hardware stores.

The purge bulb may pull excess air or no fuel when depressed

The ethanol in the fuel can also cause this issue. Over time, ethanol can crack the fuel lines and purge bulb and cause the fuel tank grommet to expand and become improperly sealed. This can lead to air leaks in the system and affect the performance of the purge bulb.

Additionally, the purge bulb itself may be faulty or weakened, which can cause it to stay depressed or return slowly. A weak or faulty bulb may not have the strength to properly draw fuel and create the necessary vacuum.

To diagnose the issue, it is recommended to perform a series of tests and checks before replacing any parts. This includes checking the fuel lines, fuel filter, carburetor, and purge bulb for any signs of damage, cracks, or blockages. It is also suggested to test the check valves and the strainer inside the carburetor, as these can become clogged or stuck, impacting the flow of fuel and the performance of the purge bulb.

If the issue is left unresolved, it can lead to starting and running problems with the equipment. The equipment may start but then die shortly after, indicating a potential issue with the fuel delivery system, including the purge bulb.

The fuel tank grommet expands and becomes improperly sealed

The fuel tank grommet is a rubber seal that creates a seal between the fuel lines and the fuel tank. Over time, the grommet can expand and become improperly sealed due to the ethanol in the fuel. This can cause the grommet to deteriorate, crack, and leak.

If you suspect that the grommet is the culprit of a fuel leak, you will likely see fuel leaking from the area where the fuel lines connect to the tank. This can pose a serious safety hazard and lead to costly repairs.

To fix a leaking fuel tank grommet, follow these steps:

Step 1: Gather Your Supplies

• New Fuel Tank Grommet: Ensure you get a grommet specifically designed for your vehicle’s make and model.
• Fuel Line Wrench: This specialised wrench is necessary for safely loosening and tightening fuel line connections.
• Safety Glasses: Protect your eyes from potential fuel splashes.
• Gloves: Protect your hands from fuel and dirt.
• Clean Rags: Wipe up spills and clean surfaces.
• Fuel Line Disconnect Tool: This tool helps to safely disconnect fuel lines without damaging them.

Step 2: Prepare Your Vehicle

• Park on a Level Surface: This ensures stability and prevents fuel spills from spreading.
• Turn Off the Engine and Disconnect the Battery: Prevent potential ignition.
• Release Fuel Line Pressure: Before disconnecting the fuel lines, release any remaining pressure by starting the engine and letting it run until it stalls.

Step 3: Disconnect the Fuel Lines

• Locate the Fuel Lines: Identify the fuel lines connected to the fuel tank.
• Use the Fuel Line Disconnect Tool: Carefully insert the tool into the fuel line connector and pull to disconnect.
• Release the Fuel Lines: Gently pull the fuel lines away from the tank.

Step 4: Replace the Grommet

• Remove the Old Grommet: Carefully remove the old grommet from the tank.
• Clean the Area: Use a clean rag to thoroughly clean the area around the fuel tank opening and the new grommet.
• Install the New Grommet: Insert the new grommet into the fuel tank opening, ensuring it sits securely and flush with the fuel tank.

Step 5: Reconnect the Fuel Lines

• Align the Fuel Lines: Carefully align the fuel lines with the grommet and the tank openings.
• Use the Fuel Line Wrench: Tighten the fuel line connectors using the wrench, but avoid overtightening.

Step 6: Test for Leaks

• Reconnect the Battery: Reconnect the battery terminal.
• Start the Engine: Start the engine and let it run for a few minutes.
• Inspect for Leaks: Check for any fuel leaks around the fuel lines and the tank. If leaks persist, tighten the connections further or replace the grommet again.

The fuel lines can be replaced with a Repower Kit

The fuel lines in an Echo trimmer can be replaced with a Repower Kit, which is available from a variety of online retailers. The kit includes all the parts required to replace the fuel lines, including a grommet, fuel filter, ventilator, purge bulb, and gas cap vent gasket. This repair is necessary when there is cracking in the purge valve, the fuel tank grommet is leaking, or the purge bulb is pulling excess air or no fuel when depressed. The ethanol that exists in fuel will eventually cause this repair to be necessary at least once during the lifetime of the trimmer.

The repair process is straightforward and can be completed in a few simple steps. First, remove the air filter by twisting the knob counterclockwise. Then, disconnect the fuel lines from the carburetor by pulling them firmly and gently prying them off if they are stuck. Next, pry the grommet from the gas tank using a flat-head screwdriver or a pair of pliers. When installing the new grommet, oil or grease its perimeter to ease installation. Insert the fuel filter through the small hole in the gas tank and reset the grommet into the fuel tank using your fingers.

Reattach the fuel lines, ensuring that the black line is firmly attached to the inner hose attachment and the yellow line to the outer hose attachment. The black hose with the white attachment is a vent cap and can be placed in a different spot if needed, as long as the vent hose is not kinked. Finally, replace the purge bulb and vent cap gasket, and reassemble the device by following the previous steps in reverse.

It is important to note that ethanol-free fuel is available at most hardware stores in pre-mixed cans and can help prolong the life of the fuel system components.

Frequently asked questions