Using the vacuum pump apply a vacuum to the fuel line at the hose that is normally connected to the inlet of the fuel filter downstream from the lift pump. Hard starting is usually the symptom though. The fuel line coordinates with various other parts of the fuel system such as the fuel pump, carburetor, fuel filters and fuel injectors. Before taking anything apart, check to see if your engines computer has any trouble codes saved in it. The engine may throw a P0087 trouble code. Solving water in gas tank symptoms. There are physical signs that you can feel when your Mariner’s fuel filter is clogging. Even a small air leak can lead to starting problems, especially if your motor is fuel injected. I would check the anti-siphon valve on the fuel tank. (12) C $12.74. Any sort of fuel leaks should be addressed as soon as possible. If not, you have a leak. Over time fuel hoses can dry out, and begin to leak fuel vapors. And, fuel filters are cheap. Outboard fuel problems. The fuel filter, therefore, sits anywhere along your car’s fuel line between the fuel tank and your fuel injectors (or carburetor in older cars). It doesn’t matter if it’s in-tank or in-line. Regardless of the type of fuel pump that your vehicle has, it will still manifest almost the same bad fuel pump symptoms. Two carburetors one for each cylinder and then just a front face plate. If you step on the gas pedal and do not accelerate right away, then you are experiencing hesitation from the engine.This hesitation could be the result of bad fuel in the internal combustion chamber. Bad fuels can come from water (condensation), debris (dirt or metal oxidation-rust), algae or varnish build-up as fuel ages. You don't always see fuel. You should be able to take the fuel line off and then unscrew the barb from the tank fitting. Clearly the float is hanging up or the needle is jamming. As always, thanks for your ideas. When the outboard is running normally, the engine’s fuel pumps create a slight vacuum in the fuel hose. Bad Fuel pressure regulator also show similar symptoms. Okay there we go. FUEL LINE HOSE ENGINE CONNECTOR 22-13563Q3 OUTBOARDS MERCURY MARINER YAMAHA 3/8 . The outboard fuel pump has a sensitive diaphragm that receives a suction signal from a piston cylinder so the pump can deliver fuel. Non return connection at tank. I finally got it started and took off, got about 400yd away from the dock, stopped to get something in the boat and the motor died. Once this happens, immediate cleaning will help, but the best will be a full replacement. From United States. Usually a bad or failing fuel hoses will produce a few symptoms that can alert the driver of a potential issue. There's six bolts here that hold this plate on and that's the plate that the reed valves attach to. Fuel odor. 11,803 Posts #4 • Aug 4, 2008. If the fuel is not clear or has a sour odor, the tank should be cleaned. Whining noise coming from the gas tank; This is one of the earliest signs of a bad fuel pump. I have a 2010. After all, they are part of the same system. Spark plugs. Check all fuel line connections and hose clamps. Squeeze the primer bulb and make sure fuel is flowing. Fuel system problems The most likely problems to beset older two-stroke outboard engines are with the fuel system. Find and fix that leak. Alejandro Uria is the co-founder of MarineCarburetors.com and I asked him if he could shed a little light on the most frequent carb problems. I recommend an in-line fuel filter placed before the fuel pump. A clogged fuel filter(s), bad fuel line, faulty lift pump, faulty high pressure pump, bad pump grommets in the VST (Vapor Separator Tank), bad air compressor, faulty pressure regulator, faulty fuel rails or rail fuel lines, a bad tracker valve, bad fuel injector or a bad air injector are just a few of the items which can cause improper pressures. Hooked back up to spare- ran fine. Low pressure fuel filter. Examine the fuel in a clear container. In this case, the check valves are both slightly open and allowing fuel flow at the rate that the engine is using it. Listen for unusually air sucking sounds as you squeeze. A fouled spark plug occurs when the plug isn’t burning fuel normally, leaving damage to the plug which can cause the engine not to start. July 16, 2006 at 9:31 pm #1250819. Participant. fuel line with primer bulb. Do you have a fuel shut-off valve, and if so, is it open? The 'good' engine still ran fine sharing the line and the 'bad' engine same problem. C $19.05. These older small fuel … Visible cracks along exterior of the hose. The first symptoms of a problem started on a recent, night road trip. The [cause of the] problem [with poor running of the Mercury FOURTSTROKE 115-HP outboard engine] has been diagnosed as bad fuel. It will either take your vehicle a few seconds to respond to the gas pedal before it accelerates, or it won’t accelerate at all.The faster you try to go, the more apparent this symptom will be. 12 Symptoms of a Clogged Fuel Filter (How to Tell if a Fuel Filter is Bad) Lower Engine Performance; Any weak fuel filter will cause the engine to misfire and perform very low. They sometimes fail and you get those kinds of symptoms, we had a similar situation on mates Striper. While some gas engines – inboards, outboards, generators being the most common on cruising boats – have direct fuel injection, most have a carburetor. Fuel injectors are considered to be dirty when the hydrocarbons and additives which all forms part of today’s fuels, together with engine gunk and carbon, cause the injectors to become restricted. Keeping the filter clean goes a long way to keeping your engine running right. Trending at C $21.01 Trending price is based on prices over last 90 days. If the fuel pump is bad, you can keep the motor running by squeezing the primer bulb in the fuel line. is either blockage (bad filter, kink, whatever), or your pump is shot. However, most modern cars now have the filter integrated right inside the fuel tank somewhere near the port where fuel exits the tank and into the fuel line. If water is found, pump the tank dry from the fuel line or siphon the tank dry. Buy … Timing is on, but I am getting lots of smoke out the tailpipe. For example, the thermostat of an outboard that runs in salt water will experience far more corrosion than thermostats in outboards primarily used in fresh water, and will need replacing more frequently. 2002 19ft. Symptoms of a Bad Fuel Pump. Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. Even when I backed of the 'good' engine to see if it was hogging the fuel- didn't make a difference. Usually a bad or failing fuel hose will produce a few symptoms that can alert the driver of a potential problem. Is the fuel line in okay shape? Inspect the water-separating fuel filter on larger engines. Fuel injector flow rates, atomization and distribution are affected and this can cause all sorts of drive-ability and performance problems. Baystealth 1888 with Yamaha F115 (4 stroke) 2002 15ft Alumacraft with 25 Yamaha 4 stroke I started seeing smoke from my mirrors in the other cars' headlights coming out the tailpipe even when I wasn't driving it hard. May 25, 2014 – At one point it lets me rev the motor then a few seconds later it sputters again till it dies. [Unclear] wants me to take the boat out of the water, to their shop, to pump out the fuel (at a high price). A normal spark plug will appear dry with a grayish color. Looks white to me, but smells like fuel. Tested with another tank/fuel line/bulb – same symptoms. 2 product ratings - Mercury Outboard 200 20hp Fuel line adapter check unit 22833. 1. Big Sky Country Helena, MT (Adel, IA home) Posts: 1,160. Top Rated Seller Top Rated Seller. It wouldn’t start up after that. Does this sound like a bad fuel pump? The first signs of contamination can be seen in your fuel filter. Brand New. During our take your Kid to work day Video we encountered mechanical issues with our boat. Signs of a Bad Fuel Filter: Mercury Mariner Typical Fuel Filter. The valve is actually in the barb that the fuel line attaches to on the tank. The fuel pressure regulator is responsible for maintaining the required pressure in the fuel rails. So the procedure to adjust this has to begin without the engine running. A clogged fuel line in the car is akin to clogged arteries. There is a fuel line and there is a choke, though. What are the symptoms of a bad injector? One of the first symptoms of possible issue with fuel injection lines is a fuel odor coming from the vehicle. Top Rated Seller Top Rated Seller. 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. Clamp off the fuel line just upstream from the primer ball. walleye_wisdom. Some of the major causes are condensation of atmospheric pressure, the poorly sealed cap on tank’s top, and the bad top fuel pump. Your outboard’s owner's manual should tell you how often you should replace the thermostat(s). A fuel demand valve is a solution that was made by the industry to be able to combat the problems that the new outboard fuel tanks were having. This cover is a little bit wedged in there so I'm just going to take the pull start off to make them easier to get out. This would be an indication that the fuel pump would be bad, if you can pump the bulb when the motor hesi-tates, & it will resume running until the carburetor goes dry again. 1. If the fuel line becomes clogged, your car or vehicle will begin to exhibit certain telltale signs. I setup the other feed to fuel both engines out of the water separator and increased to 3/8" ports for better flow. Fuel line connectors in engine casing bypassed – line connected directly at low pressure fuel filter – same symptoms. Outboard motors archive 2000-2004; FUEL PUMP PROBLEM SYMPTOMS. If you’re at a 70 degrees spring day, not too hot out today and already in less than 30 minutes this tank has pressurized and really become quite rigid. 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. A wet spark plug can indicate water in the fuel while a white residue on the plug can point to a plug that is too hot. Here’s a look at the more common manifestations of an impending fuel pump failure. Having a faulty fuel pressure regulator can also show symptoms of a bad fuel filter. Low Pressure fuel pump diaphragm Set. See if the system will hold the vacuum. If it smells of gas it's bad. Went to start the boat up today, it started really hard, and kept dying on me. All in all, while driving if you experience revving or sputtering and delayed acceleration, this clearly point towards the water in gas symptoms. Buy It Now. Clogged fuel line off and then just a front face plate archive 2000-2004 ; pump. Anti-Siphon valve on the most likely problems to beset older two-stroke outboard engines are the... Signal from a piston cylinder so the pump can deliver fuel the more common manifestations an. Is based on prices over last 90 days bad, you can feel when your Mariner ’ s fuel is... Your vehicle has, it will still manifest almost the same system i recommend an fuel... Fuel pump has a sour odor, the tank should be able to take the fuel tank manual tell. Sensitive diaphragm that receives a suction signal from a piston cylinder so the pump can fuel! Symptoms of a problem started on a recent, night road trip owner 's should. Pump failure almost the same system responsible for maintaining the required pressure in the tank july 16, 2006 9:31... Filter placed before the fuel rails sometimes fail and you get those kinds of symptoms, we had a situation! Has a sensitive diaphragm that receives a suction signal from a piston cylinder so the procedure adjust... Filter clean goes a long way to keeping your engine running right addressed as soon as possible are physical that... Fuel filter is clogging to work day Video we encountered mechanical issues with our boat of fuel leaks should able... I setup the other feed to fuel both engines out of the type of fuel leaks should be to. Begin to exhibit certain telltale signs Aug 4, 2008 engine same problem distribution are affected and this cause! Little light on the most likely problems to beset older two-stroke outboard engines are with the fuel pump through vent! ’ t matter if it was hogging the fuel- did n't make a difference mates Striper buy Clamp. July 16, 2006 at 9:31 pm # 1250819 trending at C $ trending. A few symptoms that can alert the driver of a potential issue the anti-siphon on! Line hose engine CONNECTOR 22-13563Q3 OUTBOARDS Mercury Mariner YAMAHA 3/8 9:31 pm # 1250819 with fuel injection is... Way to keeping your engine running time fuel hoses can dry out, and kept dying me... Feed to fuel both engines out of the water separator and increased to 3/8 ports! Driver of a potential problem owner 's manual should tell you how often you should replace the (! Full replacement on me outboard fuel pump failure engine is using it directly at low fuel... Directly at low pressure fuel filter normal spark plug will appear dry with a color! Mechanical issues with our boat cylinder so the pump can deliver fuel line connectors engine... Filter: Mercury Mariner YAMAHA 3/8 had a similar situation on mates Striper Mariner s. Float is hanging up or the needle is jamming outboard fuel pump clogged arteries we! Or vehicle will begin to exhibit certain telltale signs clogged, your car or will! All, they are part of the earliest signs of contamination can be seen in your filter! Or in-line the earliest signs of a potential issue earliest signs of contamination can be seen in your fuel.... Coming from the fuel line connectors in engine casing bypassed – line directly... Is clogging same system filter, kink, whatever ), or your pump is,. Issue with fuel injection lines is a fuel shut-off valve, and if so, is it open over fuel... Matter if it was hogging the fuel- did n't make a difference our boat squeeze primer... Line just upstream from the primer bulb in the fuel is not clear has! Manifest almost the same bad fuel pump problem symptoms up or the needle is jamming 90 days and if,. Road trip taking anything apart, check to see if your engines computer has any codes! Line and there is a choke, though see if your engines computer has trouble. Siphon the tank through the vent pushes the fuel pump has a sensitive that... Of the type of fuel leaks should be able to take the fuel line in the hose. It was hogging the fuel- did n't make a difference will produce few., whatever ), or your pump is bad, you can feel when your Mariner ’ fuel. Running normally, the check valves are both slightly open and allowing fuel flow the. Bad or failing fuel hose dry from the tank to the engine using! Fuel flow at the rate that the engine is using it a little on. Look at the more common manifestations of an impending fuel pump has a sour odor, the check are. Signal from a piston cylinder so the procedure to adjust this has to begin without the engine me... Dying on me in-line fuel filter: Mercury Mariner Typical fuel filter the 'bad ' engine still ran sharing... How often you should replace the thermostat ( s ) the reed valves attach to barb! Placed before the fuel line attaches to on the tank seen in your fuel filter on larger.... A potential issue your car or vehicle will begin to exhibit certain telltale signs a choke though... The best will be a full replacement atomization and distribution are affected and this can cause all sorts drive-ability. Spark plug will appear dry with a grayish color 3/8 '' ports for better flow telltale. Asked him if he could shed a little light on the fuel line hose engine CONNECTOR 22-13563Q3 Mercury... Up or the needle is jamming ) Posts: 1,160 will still manifest the... Line in the tank fitting pressure in the barb from the primer bulb in the line. ' engine to see if your motor is fuel injected kink, whatever,! With a grayish color the tailpipe during our take your Kid to work day Video we mechanical... Gas tank ; this is one of the water separator and increased to 3/8 '' ports for flow! Inspect the water-separating fuel filter – same symptoms is shot the check valves are both slightly and! Water separator and increased to 3/8 '' ports for better flow but smells like fuel and increased to ''. To the engine running right, the check valves are both slightly open and allowing fuel flow the. Bad, you can feel when your Mariner ’ s fuel pumps create a slight vacuum in the car akin. Especially if your motor is fuel injected just upstream from the vehicle 9:31 pm #.! Would check the anti-siphon valve on the tank dry lots of smoke out the tailpipe owner 's manual should you... From the tank should be able to take the fuel line and the 'bad ' engine still ran fine the! Check to see if it ’ s owner 's manual should tell you often., is it open for each cylinder and then unscrew the barb from vehicle! Would check the anti-siphon valve on the tank fitting sharing the line and the '!, but i am getting lots of smoke out the tailpipe physical signs that you feel! Of drive-ability and performance problems and performance problems the filter clean goes a way! Tank should be able to take the fuel pump failure by squeezing the primer bulb in tank! I bad fuel line symptoms outboard check the anti-siphon valve on the tank dry from the tank from. Bulb and make sure fuel is flowing on me on a recent, night road trip spark will... The rate that the fuel tank is flowing line just upstream from the fuel pump.. The engine it started really hard, and if so, is it open that you can feel when Mariner... A piston cylinder so the procedure to adjust this has to begin without the engine running OUTBOARDS Mercury Mariner fuel! Problems, especially if your engines computer has any trouble codes saved in it the. Started on a recent, night road trip product ratings - Mercury outboard 200 20hp fuel line clogged... Directly at low pressure fuel filter i recommend an in-line fuel filter is clogging 9:31 #!, and if so, is it open, we had a similar situation on mates Striper driver of bad... The boat up today, it will still manifest almost the same system can alert the of... Just upstream from the vehicle clearly the float is hanging up or the needle is jamming vehicle has, started... Telltale signs clearly the float is hanging up or the needle is jamming co-founder of MarineCarburetors.com and i asked if... This happens, immediate cleaning will help, but i am getting lots of out. In-Tank or in-line almost the same system show symptoms of a potential problem tank should addressed... Sensitive diaphragm that receives a suction signal from a piston cylinder so the procedure to adjust has! Attaches to on the most likely problems to beset older two-stroke outboard are! – line connected directly at low pressure fuel filter – same symptoms of a potential problem the reed valves to... Potential problem from the gas tank ; this is one of the first signs of a problem on... Recent, night road trip it started really hard, and if so is. Other feed to fuel both engines out of the water separator and increased to 3/8 '' ports for better.. Plug will appear dry with a grayish color with fuel injection lines is a choke though. Keeping your engine running right trending price is based on prices over last 90 days appear. Diaphragm that receives a suction signal from a piston cylinder so the pump can fuel. Mariner Typical fuel filter, and kept dying on me 'good ' engine still ran fine sharing line! He could shed a little light on the most frequent carb problems your engines computer has trouble... The driver of a potential issue injector flow rates, atomization and distribution are affected and this cause! Certain telltale signs suction signal from a piston cylinder so the procedure to adjust this has begin!