________________________________________________________________________________________
| Home / Outboard Engines / Mercury Engines / Mercury 20 ELPT |
Mercury 20 ELPT Troubleshooting
| Engine hard to start or will not start |
Gas tank is empty - Add fuel.
Low-quality gasoline - Change fuel.
Fuel system clogged - Repair or replace.
Spark plug wiring connection is defective - Check the spark plug wire connection, repair or replace.
Faulty spark plug - Replace spark plug.
Plugged fuel filter - Fuel filter needs changing.
Fuel lines are clogged - Clean fuel system lines.
Drained or worn battery - Battery needs to be recharged or replaced.
Wiring harness connections are damaged - Check wiring harness connections.
Ignition system is damaged - Check ignition components and replace if necessary.
Damaged pulse fuel pump - Change pulse fuel pump.
Faulty electric fuel pump - Change electric fuel pump as required.
Electronic control modul failure - Change electronic control modul.
| Engine starts and then stalls |
Defective spark plug - Install new spark plug.
Ignition coil is not working - Replace ignition coil as necessary.
Defective pulse fuel pump - Pulse fuel pump need to be replaced.
Fuel system is clogged - Service fuel system.
Plugged final fuel filter - Install new final filter.
Electric fuel pump is faulty - Install new electric fuel pump.
| Rough engine running |
Ignition system malfunction - Check ignition and replace faulty components.
Fuel pump is faulty or clogged - Check fuel pump and replace if necessary.
Fuel lines are clogged - Fuel lines need to be cleaned.
Fuel filter is clogged - Fuel filter needs to be replaced.
| Engine overheating |
Engine is running overloaded - Reduce load.
Wrong ignition timing - Adjust ignition timing as required.
Faulty thermostat - Replace thermostat.
Defective water pump - Change water pump as required.
| Engine noises or knocks |
Stale or low octane fuel - Use correct gasoline.
Excessive engine load - Reduce the load.
Low idle speed setting is not correct - Correct the settings.
Clogged or damaged fuel pump - Inspect fuel pump and change as required.
Worn crankshaft or main bearings - Crankshaft or bearings need to be replaced.
Worn piston rings or cylinder bore - Change defective parts.
| Engine power is insufficient |
Fuel pump is damaged or dirty - Check fuel pump and replace if necessary.
Ignition system is defective - Check ignition system and replace faulty parts.
Damaged powerhead parts - Defective parts need to be replaced.
Failed switch box, stator, or coil - Replace damaged components.
Low compression - Normalize compression.
Fuel supply problem - Check fuel system.
Manifold is leaking - Repair leaks.
Vapor separator flooding over - Check and correct malfunction.
| Excessive fuel consumption |
Loose or defective spark plug - Re-tighten or replace spark plug.
Worn piston, rings, or sleeve - Change defective parts.
Engine overload - Reduce load.
Dirty or damaged fuel injectors - Check fuel injectors and replace if necessary.
| Trim motor runs but system does not move |
Oil insufficient - Checking oil level and add if necessary.
Pump assembly faulty - Check pump and change if required.
Leakage of manual drain valve - Valve need to be closed or changed.
Motor or pump driveshaft faulty - Replace worn component.
| Trim cannot be fully up or down |
Damaged pump assembly - Change pump.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Tilt ram piston O-ring is worn - Change O-ring.
Oil level is low - Fill up oil to required level.
Lower check valve is not properly secured in port side trim ram - Install valve correctly.
________________________________________________________________________________________
________________________________________________________________________________________
| Engines Technical Specifications |