The presence of gas (bubbles) at the outlet of the marine electric fuel pump is a problem that needs to be taken seriously, because gas entering the fuel system will affect the normal operation of the engine, and may cause insufficient power, flameout or difficulty in starting. The following are possible causes and solutions:
1. Possible causes
– Insufficient fuel in the fuel tank: When the fuel level is too low, the fuel pump may inhale air.
– Fuel line leakage: The fuel line (especially the fuel inlet line) has cracks or is not connected tightly, causing air to enter.
– Fuel filter blockage or improper installation: Fuel filter blockage or improper installation may cause the fuel pump to inhale air.
– Improper fuel pump installation position: The fuel pump is installed too high or the fuel inlet line is too long, resulting in difficulty in sucking oil and inhaling air.
– Fuel tank ventilation system failure: The fuel tank ventilation system is blocked or damaged, resulting in negative pressure in the fuel tank and inhalation of air.
– Poor fuel pump seal: The seal of the fuel pump itself is damaged or aged, causing air to enter.
2. Solution
Check the fuel level: Make sure there is enough fuel in the fuel tank to prevent the fuel pump from sucking air.
Check the fuel lines: Check whether the fuel lines (especially the inlet lines) are cracked, loose or damaged. Re-tighten all connections and replace damaged lines if necessary.
Check the fuel filter: Check whether the fuel filter is blocked or improperly installed. Replace the blocked filter and ensure that it is installed correctly.
Check the installation position of the fuel pump: Make sure the fuel pump is installed in the correct position to avoid the inlet line being too long or too high. If the installation position is unreasonable, readjust the position of the fuel pump.
Check the fuel tank ventilation system: Check whether the fuel tank ventilation system is unobstructed, clean the blocked vents or replace damaged parts.
Check the fuel pump seal: Check whether the seal of the fuel pump is damaged or aged. Replace damaged seals and replace the fuel pump if necessary.
3. Operation steps
Stop and turn off the engine: Make sure the ship is in a safe state, turn off the engine and disconnect the power supply.
Check the fuel system: Check the entire fuel system from the fuel tank to the fuel pump, focusing on the pipes, filters and connections.
Exhaust air: Open the exhaust valve of the fuel system (if any) to exhaust the air. If there is no exhaust valve, you can loosen the joint of the fuel pump outlet and let the fuel flow out until there are no bubbles.
Test run: Restart the engine and observe whether there is still gas at the fuel pump outlet.
Continuous monitoring: After running for a period of time, check the fuel system again to ensure that the problem has been solved.
4. Preventive measures
– Regularly check the fuel system: including pipes, filters and fuel pumps to ensure that there are no leaks and blockages.
– Keep the fuel tank full of fuel: avoid low fuel level.
– Use high-quality accessories: When replacing the fuel filter or fuel pump, choose reliable accessories.
– Correct installation and maintenance: Install and maintain the fuel system according to the manufacturer’s requirements.
Through the above methods, the problem of gas at the outlet of the marine electric fuel pump can be effectively solved to ensure the stable operation of the engine. Of course, you can also choose OSIAS. OSIAS’s electric fuel pumps marine not only have quality assurance, but we also have professional technicians to answer your questions.