If the motor will run while the primer ball is continuously pumped then that is a pretty good indication that the lift pumps are failing/have failed. Lean fuel mixtures tend to burn more slowly. Fuel pump factory. When you go to start the engine, it simply clicks. Your outboard may be stalling & running out of fuel due to three issues. If you are having trouble starting the engine, put fresh fuel in the tank and try again. 6 Causes of Low Fuel pressure The in-line filter further separates smaller contaminants from the fuel before getting to the VST. With your other hand, pull the rope start, or turn the starter over to turn the engine over four or five times. Take the spark plug wire boot off the plug tip. However, if you want to get right to the outboard fuel pump, we have the steps you need to know.if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-bornagainboating_com-box-4-0')}; Another form of testing to see if there are fuel tank issues is to pressure test your fuel tank to find leaks, which we cover in this article here. To understand what you are looking at, you must first know the components of the outboard fuel system. Watch our Yamaha Outboard Fuel Pump Issues video above — in which we guide you through an outboard's fuel system — to troubleshoot possible issues that may be causing fuel pump problems. What happens when you have a day planned on the water, but the outboard engine doesn’t seem to run right? Check the high-pressure fuel pump oper- 5-18 ation using the YDIS. Typically, what you think is a fuel pump issue is generally another component failing, such as a fuel pump diaphragm or bad check valve. Check your fuel filter to make sure it’s not clogged and restricting flow. Not at all! When the outboard is running normally, the engine’s fuel pumps create a slight vacuum in the fuel hose. Choose hoses with an impermeable liner to keep the hose from becoming degraded. … Pressurize the fuel system with the priming bulb. No mention of the mechanic taking parts from the good motor to try on the bad motor. Page 19 Features and benefits Low-pressure fuel pump The F225 has adopted a newly developed, low-pressure electrical fuel pump, in place of the low- pressure mechanical fuel pump used in the previous electronic fuel injection system. This sounds like the same problem I am having! All times are GMT-5. There was no sound coming from the fuel pump (was not priming). Normal fuel pumps will put out between five and seven PSI. If the mechanic used YDIS to measure the TPS voltage he could have seen the fuel pump output pressure. Marine Mechanic. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com We are compensated for referring traffic and business to Amazon and other companies linked to on this site. If the compression seems okay, you can reinstall the spark plug and perform the same test on the other cylinders. Have a Yamaha 2002 F225. Often, other fuel system components are easier to troubleshoot and eliminate. Fuel pump factory. Letting you know that the fuel pump diaphragm is bad! A blocked low-pressure fuel filter causes hard starting, stalling, misfire or poor performance. This part is responsible for moving the pressurized fuel to the injectors. Went down to boat today and replaced the lp pumps. If your outboard motor has a mechanical fuel pump. Today, he spends his time freelance writing and consulting. just before the fuel pump, some clear hose also at the fuel pump inlet and a pressure gauge at fuel pump outlet. However, you can’t judge simply based on this fact, as slow speeds will naturally improve fuel economy, but also cause the motor to run longer, putting more age on the engine. You want to run your outboard motor at its peak efficiency. Connect your fuel pressure gauge to the pulse hose. I think one or both of my low pressure pumps might be going on my 200 hpdi. My question is what's the best way to determine this and how hard would it be to replace them? if fuel leaks its ruptured if it doesn't its ok. The fuel pump on an outboard motor works differently than the one found in your car or truck.if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-bornagainboating_com-medrectangle-3-0')}; When the cylinder leaks, the pump pulse signal isn’t strong enough to get the right amount of fuel to the cylinder. Why Won’t My Outboard Boat Engine Turn Over!? Buy marine certified fuel hoses. Additionally, check the sump pickup screen for clogs. Yet, this vital... Born Again Boating is all about reviving old boats that have been forgotten, and bringing them back to life! 1680 West Winton Ave Ste 3, Hayward, Ca 94545. 2004 Mercury/Yamaha 4-stoke EFI 115hp EXLPT OT812944 1950hrs. Allowing the raw fuel to make its way out the exhaust and straight into the water. Just Click Here! You can test that theory without taking the fuel pump off your motor and without returning to shore. The fuel pump is driven from the pulses of the crankcase or from a rod that is driven by the crankshaft. What is bad gas? If the filter is good, reinstall it and tighten the clamps back up with your screwdriver. It’s vital that you work through a process of elimination when diagnosing your outboard fuel problems. Most of the problems I have seen on this engine ( we sell more of this engine than any other horsepower Yamaha) have been fuel issues, injector screens get clogged, the fuel filter on the bottom of the high pressure fuel pump in the Vapor Separator Tank gets clogged (located behind the intake manifold) this will cause a low volume of fuel to be supplied to the engine and it will run lean. Commonly operators use bad gas or have a failing fuel filter. Water and trash can get into the fuel supply, causing a clog to occur. Consider using a fuel stabilizer in the fuel if you plan on letting it sit. Eventually, these tactics won’t work any longer. Additionally, when fuel sits in the tank for too long, it loses octane and starts to separate or gum up the system. I had a friend with me and he told me to turn the ign switch to position one. On some designs. Ethanol fuels shouldn’t be kept in the tank for more than thirty days. Yamaha Outboard Parts by HP 150HP F150TJR Fuel 1. Plugs new and vst filter new. As the fuel pump produces less pressure, the engine fails to operate. You can also inspect the fuel primer bulb for leaks and cracks. This component draws fuel out of the tank and directs it to the engine. Eventually, these will fail completely, causing the engine to stop running. Monitoring the fuel pressures will tell you a lot about what is going on. Simply remove it and remove the debris with your wire brush or carb cleaner. However, just like your automotive filter, it can clog up over time. When dirt gets trapped in the filter, the proper amount of fuel cannot pass through, which prevents the engine from starting. Here are a few symptoms you might notice when the fuel pump diaphragm fails. To avoid headaches, it’s best to prevent a failure from occurring in the first place. This is a sure sign that the fuel pump can’t supply the fuel fast enough to keep up. 08-27-2014, 09:39 PM. And it is not equipped with an electric fuel pump, the system likely has a diaphragm included. The most common symptom of low fuel pressure is a wrong air-fuel mixture, which will cause your car’s performance to drop drastically. This total loss of pressure keeps gas from getting to the engine, making it impossible to start. Turn off the main electrical cutoff switch. Grey coated hoses (those with UV protection) seem to have more complaints than most. It barely runs at idle, and knocks about every 4-6 seconds. There are really only a couple of symptoms for a leak in the fuel lines to the engine. I talked to one boat dealer and he told me to take to fuel pump off and just drop it. Blow air through the tank vent, ensuring that it is flowing freely. Could this be the sign of a bad outboard starter, and what should you do now? Bad Fuel Pump Symptoms? Make sure you have a container underneath the hose as fuel will discharge. It could be that you put gas into the tank that is tainted, or it might have gone bad while in the motor or fuel tank from sitting for too long. 22,043 satisfied customers. With the adop- tion of the electric pump, the routing of the fuel system has been made more compact. Before storing it for the winter, run the stabilizer through the tank for a few minutes. I also noticed that there are a lot of large air bubbles coming fro … read more. I have a 2003 F200 that I bought new in 2003 on my Parker. Next, the fuel passes through the primary (low pressure) fuel pump and then through the Yamaha outboard inline fuel filter, which is located between the LP pump and the vapor separator tank. A fuel / air leak somewhere in the line between the tank and the engine. When this occurs, the fuel can’t pass through freely and a lack of pressure causes trouble. Move this wire around from the opening by taping it to another part or wedging it between components. You got the boat packed with your gear and your best friends. the only way to check is to replace the spring diaphragm and if it works then you know it was faulty otherwise there is no way of finding it out ,its only a … Not only will this help to burn less fuel, but also prolongs the life of the engine.if(typeof __ez_fad_position != 'undefined'){__ez_fad_position('div-gpt-ad-bornagainboating_com-large-mobile-banner-1-0')}; To determine the best speed for your boat, you want to listen to the sound of the engine.

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