Two carburetors one for each cylinder and then just a front face plate. Check all fuel line connections and hose clamps. fuel line with primer bulb. You should be able to take the fuel line off and then unscrew the barb from the tank fitting. Is the fuel line in okay shape? From United States. The outboard fuel pump has a sensitive diaphragm that receives a suction signal from a piston cylinder so the pump can deliver fuel. 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. There's six bolts here that hold this plate on and that's the plate that the reed valves attach to. Whining noise coming from the gas tank; This is one of the earliest signs of a bad fuel pump. In this case, the check valves are both slightly open and allowing fuel flow at the rate that the engine is using it. Brand New. 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. Tested with another tank/fuel line/bulb – same symptoms. You don't always see fuel. When the outboard is running normally, the engine’s fuel pumps create a slight vacuum in the fuel hose. FUEL LINE HOSE ENGINE CONNECTOR 22-13563Q3 OUTBOARDS MERCURY MARINER YAMAHA 3/8 . 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. Hooked back up to spare- ran fine. Looks white to me, but smells like fuel. I recommend an in-line fuel filter placed before the fuel pump. The first symptoms of a problem started on a recent, night road trip. Find and fix that leak. C $19.05. And, fuel filters are cheap. If the fuel pump is bad, you can keep the motor running by squeezing the primer bulb in the fuel line. Fuel odor. Here’s a look at the more common manifestations of an impending fuel pump failure. If water is found, pump the tank dry from the fuel line or siphon the tank dry. 1. Inspect the water-separating fuel filter on larger engines. Fuel system problems The most likely problems to beset older two-stroke outboard engines are with the fuel system. Okay there we go. As always, thanks for your ideas. Fuel line connectors in engine casing bypassed – line connected directly at low pressure fuel filter – same symptoms. 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. See if the system will hold the vacuum. Solving water in gas tank symptoms. Signs of a Bad Fuel Filter: Mercury Mariner Typical Fuel Filter. Big Sky Country Helena, MT (Adel, IA home) Posts: 1,160. is either blockage (bad filter, kink, whatever), or your pump is shot. 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. 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. While some gas engines – inboards, outboards, generators being the most common on cruising boats – have direct fuel injection, most have a carburetor. walleye_wisdom. Do you have a fuel shut-off valve, and if so, is it open? [Unclear] wants me to take the boat out of the water, to their shop, to pump out the fuel (at a high price). All in all, while driving if you experience revving or sputtering and delayed acceleration, this clearly point towards the water in gas symptoms. 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. Squeeze the primer bulb and make sure fuel is flowing. Buy … Low Pressure fuel pump diaphragm Set. Non return connection at tank. Went to start the boat up today, it started really hard, and kept dying on me. Trending at C $21.01 Trending price is based on prices over last 90 days. (12) C $12.74. I started seeing smoke from my mirrors in the other cars' headlights coming out the tailpipe even when I wasn't driving it hard. 1. If the fuel is not clear or has a sour odor, the tank should be cleaned. Usually a bad or failing fuel hoses will produce a few symptoms that can alert the driver of a potential issue. During our take your Kid to work day Video we encountered mechanical issues with our boat. Does this sound like a bad fuel pump? Over time fuel hoses can dry out, and begin to leak fuel vapors. July 16, 2006 at 9:31 pm #1250819. The engine may throw a P0087 trouble code. Top Rated Seller Top Rated Seller. If not, you have a leak. 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. 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. Participant. 11,803 Posts #4 • Aug 4, 2008. I have a 2010. Examine the fuel in a clear container. Visible cracks along exterior of the hose. 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. So the procedure to adjust this has to begin without the engine running. Spark plugs. 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. What are the symptoms of a bad injector? 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. Buy It Now. Bad fuels can come from water (condensation), debris (dirt or metal oxidation-rust), algae or varnish build-up as fuel ages. Hard starting is usually the symptom though. Even a small air leak can lead to starting problems, especially if your motor is fuel injected. It doesn’t matter if it’s in-tank or in-line. Clearly the float is hanging up or the needle is jamming. Even when I backed of the 'good' engine to see if it was hogging the fuel- didn't make a difference. There are physical signs that you can feel when your Mariner’s fuel filter is clogging. There is a fuel line and there is a choke, though. The 'good' engine still ran fine sharing the line and the 'bad' engine same problem. It wouldn’t start up after that. 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. Fuel injector flow rates, atomization and distribution are affected and this can cause all sorts of drive-ability and performance problems. The valve is actually in the barb that the fuel line attaches to on the tank. If the fuel line becomes clogged, your car or vehicle will begin to exhibit certain telltale signs. After all, they are part of the same system. 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