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. 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. 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. Looks white to me, but smells like fuel. The 'good' engine still ran fine sharing the line and the 'bad' engine same problem. (12) C $12.74. 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. Inspect the water-separating fuel filter on larger engines. 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. 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. Fuel line connectors in engine casing bypassed – line connected directly at low pressure fuel filter – same symptoms. July 16, 2006 at 9:31 pm #1250819. After all, they are part of the same system. Squeeze the primer bulb and make sure fuel is flowing. The first signs of contamination can be seen in your fuel filter. If not, you have a leak. Find and fix that leak. If it smells of gas it's bad. Non return connection at tank. I have a 2010. Signs of a Bad Fuel Filter: Mercury Mariner Typical Fuel Filter. The [cause of the] problem [with poor running of the Mercury FOURTSTROKE 115-HP outboard engine] has been diagnosed as bad fuel. Fuel odor. The outboard fuel pump has a sensitive diaphragm that receives a suction signal from a piston cylinder so the pump can deliver fuel. FUEL LINE HOSE ENGINE CONNECTOR 22-13563Q3 OUTBOARDS MERCURY MARINER YAMAHA 3/8 . Outboard motors archive 2000-2004; FUEL PUMP PROBLEM SYMPTOMS. What are the symptoms of a bad injector? 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. 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. Keeping the filter clean goes a long way to keeping your engine running right. Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. C $19.05. Even a small air leak can lead to starting problems, especially if your motor is fuel injected. Your outboard’s owner's manual should tell you how often you should replace the thermostat(s). Went to start the boat up today, it started really hard, and kept dying on me. Some of the major causes are condensation of atmospheric pressure, the poorly sealed cap on tank’s top, and the bad top fuel pump. Timing is on, but I am getting lots of smoke out the tailpipe. Okay there we go. As always, thanks for your ideas. 11,803 Posts #4 • Aug 4, 2008. There's six bolts here that hold this plate on and that's the plate that the reed valves attach to. These older small fuel … Check all fuel line connections and hose clamps. If water is found, pump the tank dry from the fuel line or siphon the tank dry. Having a faulty fuel pressure regulator can also show symptoms of a bad fuel filter. 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. Any sort of fuel leaks should be addressed as soon as possible. I setup the other feed to fuel both engines out of the water separator and increased to 3/8" ports for better flow. Clearly the float is hanging up or the needle is jamming. Big Sky Country Helena, MT (Adel, IA home) Posts: 1,160. walleye_wisdom. Whining noise coming from the gas tank; This is one of the earliest signs of a bad fuel pump. From United States. Does this sound like a bad fuel pump? I recommend an in-line fuel filter placed before the fuel pump. Tested with another tank/fuel line/bulb – same symptoms. 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. See if the system will hold the vacuum. All in all, while driving if you experience revving or sputtering and delayed acceleration, this clearly point towards the water in gas symptoms. Visible cracks along exterior of the hose. The fuel line coordinates with various other parts of the fuel system such as the fuel pump, carburetor, fuel filters and fuel injectors. Even when I backed of the 'good' engine to see if it was hogging the fuel- didn't make a difference. If the fuel line becomes clogged, your car or vehicle will begin to exhibit certain telltale signs. 2 product ratings - Mercury Outboard 200 20hp Fuel line adapter check unit 22833. 1. 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. Here’s a look at the more common manifestations of an impending fuel pump failure. Spark plugs. Usually a bad or failing fuel hoses will produce a few symptoms that can alert the driver of a potential issue. Trending at C $21.01 Trending price is based on prices over last 90 days. Hooked back up to spare- ran fine. Buy It Now. 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. I would check the anti-siphon valve on the fuel tank. Fuel system problems The most likely problems to beset older two-stroke outboard engines are with the fuel system. A clogged fuel line in the car is akin to clogged arteries. Do you have a fuel shut-off valve, and if so, is it open? They sometimes fail and you get those kinds of symptoms, we had a similar situation on mates Striper. Over time fuel hoses can dry out, and begin to leak fuel vapors. So the procedure to adjust this has to begin without the engine running. 1. It doesn’t matter if it’s in-tank or in-line. During our take your Kid to work day Video we encountered mechanical issues with our boat. Regardless of the type of fuel pump that your vehicle has, it will still manifest almost the same bad fuel pump symptoms. Participant. The valve is actually in the barb that the fuel line attaches to on the tank. Bad Fuel pressure regulator also show similar symptoms. 2002 19ft. fuel line with primer bulb. 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. If the fuel is not clear or has a sour odor, the tank should be cleaned. 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. I started seeing smoke from my mirrors in the other cars' headlights coming out the tailpipe even when I wasn't driving it hard. Is the fuel line in okay shape? Two carburetors one for each cylinder and then just a front face plate. 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. [Unclear] wants me to take the boat out of the water, to their shop, to pump out the fuel (at a high price). The first symptoms of a problem started on a recent, night road trip. Listen for unusually air sucking sounds as you squeeze. Once this happens, immediate cleaning will help, but the best will be a full replacement. There are physical signs that you can feel when your Mariner’s fuel filter is clogging. 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. Top Rated Seller Top Rated Seller. The fuel pressure regulator is responsible for maintaining the required pressure in the fuel rails. Hard starting is usually the symptom though. 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