20
Feb
Your outboard motor is the heart of your marine vessel and if it is having trouble with the fuel supply it can put a damper on your day on the lake river or ocean. The engine is not Receiving Enough Fuel.
Watching this you can check fuel flow all the way from the tank to the.
Outboard motor fuel tank problems. A blocked outboard fuel line prevents fuel from getting to the motor. It generally starts with a partial blockage where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. If theres fuel in the tank the problem may be a faulty check valve.
You can check the patency of the hose and the check valves function by doing the following. Remove the fuel hoses engine connector from the engine and stick one end of a paper clip into the steel ball end. This will open the connector to air.
Fuel system problems. The most likely problems to beset older two-stroke outboard engines are with the fuel system. Modern fuels have a shelf life of only a few months especially when mixed with two-stroke oil with the fuel leaving a black varnish or gum on the inside of the carburetor when it evaporates.
When the outboard is running normally the engines fuel pumps create a slight vacuum in the fuel hose. Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. In this case the check valves are both slightly open and allowing fuel flow at the rate that the engine is using it.
When the days boating is over most boaters disconnect the hose at the. Fuel mixture may not be according to factory specifications. So you have to check the fuel tank and change the gasoline if required.
Carburetor float level may be wrong. You should refer to the service manual to learn how to adjust the level to factory specifications. Outboard motors should be kept cool with ample.
When the outboard fuel pump is bad it operates similarly to when the boat runs out of fuel. You might notice sputtering or misfiring before the engine cuts out completely. To help you get back on the water we will talk about how the outboard fuel system works discuss ways to troubleshoot the issues and give you some expert pointers along the way.
Outboard engines lose fuel prime because of an air leak in the fuel system. Somewhere between the engine and the fuel tank. Here are the best and quickest ways to troubleshoot and resolve this issue.
What Are The Symptoms of An Air Leak. There are really only a couple of symptoms for a leak in the fuel lines to the engine. Either the engine randomly runs out of fuel and dies.
Cheap fuel lines hose clamps and connectors commonly cause problems with your outboard engine. First squeeze the ball as you watch the fitting between the engine and the line the barb and the hose the barb on either end of the ball and if its visible the fitting between the line and the tank. You can check this by pumping the primer bulb until it feels hard.
Fuel should travel easily from the tank all the way to the pump. Your outboard fuel filter located just before the fuel pump should be full. With the engine off and the cowl cover removed remove the spark plug wire boot and remove the plug.
This video will show you how to check the fuel delivery through your outboard motor. Watching this you can check fuel flow all the way from the tank to the. Ethanol-blended fuel problems.
Fuel systems that use ethanol-blended fuel can experience issues like sputtering or losing power if the fuel goes bad. Its good to have a spare filter on board as well. When this occurs the water and ethanol settle at the bottom of the tank and can be drawn through the fuel pick up causing harmful engine and fuel system problems.
Even if the water were not drawn into the motor the gas at the top of the separated fuel is now a much lower octane and can itself create issues for the motor. Common Boat Fuel System Problems. If you are having problems with your boats outboard motor the fuel system is the first place to start your investigations.
Here are some of the more common boat fuel system problems. Condensation can be a big problem with fuel tanks. If your outboard has an external gas tank there can be a number of problems between it and the motor.
Do a quick visual inspection from the tank to the motor and then run your hand along the fuel hose. Many times the problem will be very apparent when you do this. Outboard Motor Does Not Start.
Empty gas tank or dirty low-quality fuelClosed gas tank air ventClogged fuel filter or fuel line leakageDamaged batteryFaulty kill switch. Engine May Stalls Loss Power or Make Excessive Vibration. Watch our Yamaha Outboard Fuel Pump Issues video above in which we guide you through an outboards fuel system to troubleshoot possible issues that may be causing fuel pump problems.
Although were using a Yamaha 250HP motor as an example the fuel system will be very similar on any modern outboard regardless of brand or model. Your outboard motor is the heart of your marine vessel and if it is having trouble with the fuel supply it can put a damper on your day on the lake river or ocean. Two of the most common problems when it comes to fuel supply in your outboard motor are bad fuel and a bad fuel filter.
Jammed CarbeuratorClogged Fuel FilterGunk in Idle JetsPetrol Tank Vent Blockage. Crankshaft Thrust Bearing Failure. Starting IssueLack of Power.
Failed Fuel Injection SystemSome Corrosion. Hondas Design and Features. The engine is not Receiving Enough Fuel.
In some cases the engine becomes starved of fuel and fails to start. This happens over and over because of cheap quick-disconnect fittings attaching the boats fuel line to its outboard. This is also true for the boat barbs that attach the fuel lines and fittings or the hose clamps that secure them.