mercury 25 hp 4 stroke troubleshooting manual

Remember, the fuel tank air vent should always stay open and free from friction.Īnother possible reason behind this problem can be the damaged or restricted fuel lines and fuel filters. If it is not open, turn it on the open position. Therefore, check and inspect the air vent located on the fuel tank. The problem can also occur if the fuel tank air vent is closed or restricted. The fuel pump gets affected by the damaged diaphragm or one-way valves so, check them and replace the faulty part. Now, you should check the compression gauge reading, and if the gauge reading shows less or above 30 PSI, the compression gauge needs to replace.

Then, disconnect and remove the cowl cover, the plug, spark plug wire boot. The manual will guide you to select accurate specs and learn the exact procedures to follow to fix your fuel pump’s issue.įirst, start the fuel pump testing by turning off the outboard engine’s power.

It may occur when your fuel pump has low pressure, so you need to perform a test to inspect the fuel pump and fix the problem.īefore performing the test, make sure to read the repair service provided with your outboard. However, various reasons may cause this particular commotion, but first, you need to do the proper investigation. Users claimed that the outboard motor runs irregularly or unevenly while they put it neutral or out of gear. Motor May Experience Sputtering Or Powe Loss IssuesĪccording to Mercury 25 HP 4 stroke many users, sometimes the motor idles rough or stalls. Ignition system has no spark or even weak or low sparkIf the Carburetor is overflooded Low pressure on the fuel pumpFuel tank air vent is closed or restrictedDamaged or restricted fuel lines and fuel filters In this article, I will reveal the most common problems that may occur with the Mercury 25 HP 4 stroke outboard motor and let you know how to deal with those problems.

Though this advanced, compact Mercury outboard motor offers EFI that no other outboard or boat manufacturer offers at this horsepower rating, often users experience some troubleshooting issues while using it. The Mercury 25 HP 4 stroke outboard motor model delivers constant easy starting, crisp throttle response, maximized fuel economy, and overall outstanding performance.

Mercury 25 hp 4 stroke troubleshooting manual