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Oct
If the engine stalls for any reason the ECU is supposed to shut down the pump. Your Yamaha outboard engine has a vapor separator tank next to the electric fuel pump.
The other pump - low pressure aka lift pump -.
Yamaha outboard fuel pump problems. 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. Generally fuel pumps themselves should be replaced as needed but Yamaha specifically recommends that outboard fuel pumps should be replaced every 3 years.
With regular maintenance the proper kit for your Yamaha or Mercury model and the right set of tools most outboard issues are fully preventable. Still there are a few specific ways to keep your outboard. Yamaha Outboard Wont Start Fuel Pump Failure Stalling - YouTube.
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.
The fuel pump sounds like it is working. Put the key in the on position you hear it come on and prime or attempt to prime. Youve got two electric fuel pumps what you hear at key on is the pump inside the VST pressurizing the fuel rail.
The other pump - low pressure aka lift pump -. Long story short Ive narrowed it down to the fuel pump. When I pump the primer bulb and start the motor it will run until about 3000 rpm and up it will surge.
Also if I accelerated to quickly it would act very sluggish. When I shut it off then start it up in a few minutes it will run for about 30 seconds and all have to pump the bulb again. Anyone ever have problems with the VST on their Yamaha 4 Stroke.
My port fuel pump went this weekend on a engine with only 95 hours. The dealer is saying they need to replace the pump and VST. They are doing both engines and charging 1200 to replaces both VST filters.
Price seems steep to change a few filters. A problem in the fuel compression or ignition systems can cause poor starting loss of power or other problems. This basic troubleshooting and possible remedies and covers all Yamaha outboard motors.
Therefore some items may not apply to your model. If any more questions please consult your Yamaha dealer or the experienced service shops. My 2001 Yamaha F-100 outboard has frequent fuel problems.
I drain the tank every year use good Chevron gas use Yamaha fuel stabilizer replace the fuel filter and water seperator 2x per year and yet I must still get the 4 carbs cleaned and synced every year. Your Yamaha outboards fuel system is an electronically-controlled system that injects a precise amount of atomized fuel into the engines cylinders. Main components within the fuel system include the fuel pump fuel filter check valves fuel hoses fuel pump diaphragm injectors and more.
The first step in this process is to start the engine and disconnect the fuel line. Then let the engine idle until it runs out of fuel. Next place a rag under the carburetor and open up the carb drain screw.
Once all the remaining fuel has drained away the engine can sit for several months without any issues. It may be that when your Yamaha outboard motor begins to sputter and cough particularly at high speeds you think somethings obviously wrong with the fuel pump. You can test that theory without taking the fuel pump off your motor and without returning to shore.
If you think you have a problem with your. Your Yamaha outboard engine has a vapor separator tank next to the electric fuel pump. The filter in VST treats the fuel before sending it to the next component in the system.
Due to various reasons it can get clogged and cause some issues. In this article I am going to talk about Yamaha VST filter symptoms and signs along with possible solutions. The fuel pump relay turns the fuel pump on and off.
If the pump is running the relay is working. That engine also has a fuel pump that runs at 2 different speeds by controlling the voltage to it. If the fuel pump runsyou can hear it but its pressure is low or non existent the filter could be clogged on that pump or the pump is bad.
It seems like the engine is starving for fuel or the fuel pump stops working or there is a blockage in the supply line. If the engine is not used for long runs there is no problem. The engine also will sometimes stall when it is brought to an idle after running for a short while.
Fuel Pump May Turn Bad. Another common problem that few users have already encounter with Yamaha VMAX SHO motors is the bad fuel pump issue. According to those users after using it for years sometimes they experience that the outboard engine starts sputtering or act like out of fuel and does not run smoothly like before.
Im having an issue with fuel supply to the motor. This is on a 2013 HB PRO with 2012Yamaha F70LA fuel injected outboard 180 hrs. Motor runs fine for first part of day I usually run about 15-20 min to my first fishing spot.
When I go to jump on plane to hit spot 2 I get up and can usually run before the motor starts stalling and I lose RPMs. The outboard fuel pump has a sensitive diaphragm that receives a suction signal from a piston cylinder so the pump can deliver fuel. If the cylinder has a leak the pump pulse signal will not be strong enough to send the proper amount of fuel to the cylinder.
Outboard fuel pumps rarely fail and diagnosing a fuel problem involves checking other components that can be easily mistaken for a bad check valve or diaphragm in a fuel pump. 2002 Yamaha 150 OX66 Fuel Problems on that motor at key on the pump runs for a few seconds if the ECU doesnt get a pulser coil signal indicating the flywheel is moving it turns off. Once running the pump always runs or the engine wont.
If the engine stalls for any reason the ECU is supposed to shut down the pump.