15
Jul
You may have put gas into the fuel tank that is tainted or it may actually go bad inside the motor. The fuel pump is the very thing that fuels your vehicle.
Originally posted by rodbolt17 View Post.
How to tell if outboard fuel pump is bad. Slowing Stopping or Sputtering. Another common symptom of a bad fuel pump is sputtering or misfiring. If youre experiencing a bumpy ride or possibly losing speed altogether it could also be a sign of a clogged fuel filter that wont allow a consistent flow.
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.
Water in the fuel may also cause a bad or failing fuel pump. If you find water in your fuel you may want to check that the pump is in good condition. You can perform a mercury outboard fuel pump test by removing the spark plug wire boot from the spark plug and then removing the spark plug with a plug socket and wrench.
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.
How To Tell If Fuel Pump Is Bad On Outboard 15 PDF How To Tell If Fuel Pump Is Bad On Outboard Gas Age- 1894 Includes summaries of proceedings and addresses of annual meetings of various gas associations. Set includes an index to these proceedings 1884-1902 issued as a supplement to Progressive age Feb. How to Test an Outboard Fuel Pump.
Turn off your main electrical cutoff switch that governs motor ignition. Screw a compression gauge hose into the spark plug hole. Refer to your owners manual for the correct psi your engine needs.
Check to make sure you have enough gas in the tank to be picked up by the sump. Bad Fuel Pump Symptoms. DT40 its pulling more fuel than it can deliver when you shut the engine off the fuel that was sucked out is replaced with air as everything balances out again.
Rebuild your fuel pump. The only other plausible cause would be a fuel line restriction. The fuel pump takes over drawing fuel from the tank.
The bulb will go soft. If you have to keep priming it the fuel pump is obviously not doing the job. That does not mean either the pump or the primer bulb is failing.
The most likely cause is air leakage into the fuel lines probably at a connector with worn out O rings at the tank or at the motor. Boat surges and slows or has trouble accelerating over a certain speed. Sometimes misfiresbackfires when having these other symptoms.
Your fuel pump is whining. Well I have found that in the majority of the cases I have seen the actual problem is the very small filter on the fuel intake side of the fuel pump. In this manner how do I know if my outboard fuel pump is bad.
From smooth sailing to a bumpy ride Sputtering or misfiring is another sign that the fuel pump may be on its way out. When the pump is not providing fuel consistently you will experience sputtering and may even find that the engine dies while the machine is still in motion. Check the fuel pump fuse.
Often its not the pump itself that fails to function but the power that supplies it. Check in your owners manual for the location of the fuse box then find the fuse that corresponds to the fuel pump. Pull it out and inspect it for signs of failure.
If the fuse is blown it will be broken or burned. If the mechanic used YDIS to measure the TPS voltage he could have seen the fuel pump output pressure. No mention of the mechanic taking parts from the good motor to try on the bad motor.
Just a trend of throwing parts at the problem. Originally posted by rodbolt17 View Post. Loss of fuel in the VST AND excessive fuel in the oil sump.
A quick test you ask. Simply unbolt it leaving the fuel lines attached. If fuel leaks its ruptured if it doesnt its ok.
How do I know if my outboard fuel pump is bad. From smooth sailing to a bumpy ride Sputtering or misfiring is another sign that the fuel pump may be on its way out. When the pump is not providing fuel consistently you will experience sputtering and may even find that the engine dies while the machine is still in motion.
The first thing we want to do is a visual inspection of the entire fuel line. Starting at the engine. Follow along the fuel line moving it around and looking at it.
Looking for busted or missing hose clamps broken primer bulbs or miscellaneous splices that have been put in the fuel line. How to check a fuel pump in your car DIY with Scotty Kilmer. How to tell if your cars fuel pump is bad and needs repair.
Some simple tests a. 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. How Should You React If You Detect A Bad Yamaha VST Filter. You know the nature of a faulty VST filter of the Yamaha outboard engine.
And it is time to take some actions to solve it. First of all buy a fuel pressure gauge which should cost you no more than 50 bucks. Connect the gauge to the Schrader valve tire stem.
The fuel pump is the very thing that fuels your vehicle. If you see any of the signs of a bad fuel pump you need to test the fuel pump first in order to repair or replace it as soon as possible. Now that you know how to test a fuel pump you will be able to diagnose the issue right after seeing major red-flags and prevent further complications.
Most mechanical fuel pumps have a weep hole on the bottom of the unit. When the internal diaphragm leaks fuel escapes through the weep hole to notify the vehicle owner of a malfunction. This is one of the more common fuel pump problems found in classic cars that are between 30 and 60 years old.
Another common place for a fuel leak to develop. Getting bad gasoline in your outboard can mean two different things. You may have put gas into the fuel tank that is tainted or it may actually go bad inside the motor.
When trash or water gets into the fuel supply it can clog the system or at least cause it to run improperly.