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Rebuild your fuel pump. D dougl58 Cadet Joined Apr 4 2010 Messages.
Guess its been that way.
Outboard motor fuel pump symptoms. 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.
The symptoms of a bad fuel pump on a boat are engine sputtering at high speeds poor acceleration under heavy loads increased fuel consumption increased engine temperatures and the engine sounds rough whine. If you see one of those symptoms your fuel pump might be causing those problems. How do you test a fuel pump on an outboard motor.
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.
If the motor stalls when you stop pumping it is a fuel pump fuel intake issue for sure. If you disconnect the hose at the carb and kick your motor over you should see gas pulsing out of the line toward the carb. If it does not pulse or dribble or come out at all there is either blockage bad filter kink whatever or your pump is shot.
Fuel pumps on outboard motors work a little bit differently than they do on automobile engines. The outboard fuel pump has a sensitive diaphragm that receives a suction signal from a piston cylinder so the pump can deliver fuel. Herein what are the symptoms of a bad fuel pump on an outboard motor.
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. What are the symptoms of a bad fuel pump on an outboard motor. 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. I know many people who have the symptoms of. Boat hesitates when you gun it.
Boat surges and slows or has trouble accelerating over a certain speed. Sometimes misfiresbackfires when having these other symptoms Your fuel pump is whining. Did you remember to clamp down the fuel lines tight to the inlets.
It sounds like you might be having air leaking in. Fuel line from the pump to the carbs did not have any clamps on it. Guess its been that way.
I put clamps on both ends. I took the fuel pump off again and the diaphragm looks fine. D dougl58 Cadet Joined Apr 4 2010 Messages.
Squeeze the primer bulb and make sure fuel is flowing. Listen for unusually air sucking sounds as you squeeze. Check all fuel line connections and hose clamps.
If you have a fuel water separator with a sight bowl check for contamination. Flooded Engine Its also worth noting that the engine might be flooded. The fuel pump has one job and thats to pump fuel from the fuel tank to the motor.
If the fuel pump isnt working properly the engine wont either. As such if a faulty fuel pump isnt supplying enough fuel to the motor the engine wont achieve wide-open throttle WOT and may stall when idling. 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. A fuel pump is an essential part of your boat motor as it helps move the fuel from the tank to the fuel injection system.
These pumps come in a wide variety of styles and specs and they can greatly affect the way your motor burns fuel and subsequently how much power your engine generates. 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. Sure signs that there is a fuel or fuel filter problem include a loss of pressure in the fuel pump that leads to loss of power or the inability to start the engine.
The motor may surge at high speeds or it may cut out or hesitate. Occasionally the motor will quit altogether and will not re-start. When the outboard is running normally the engines fuel pumps create a slight vacuum in the fuel hose.
Atmospheric pressure in the tank through the vent pushes the fuel from the tank to the engine. In this case the check valves are both slightly open and allowing fuel flow at the rate that the engine is using it. How To Repair Fuel Pump VRO Johnson Evinrude Outboard Motor Change Diaphragm - YouTube.
Was the vent on the tank accidently closed or is there a small air leak somewhere in the fuel hose and fittings. If its sucking a little air its loosing its prime and the fuel pump cant pull gas from the tank especially like gary said if you can squeez the primer bulb because its empty. First start the fuel pump testing by turning off the outboard engines power.
Then disconnect and remove the cowl cover the plug spark plug wire boot. Now you should check the compression gauge reading and if the gauge reading shows less or above 30 PSI the compression gauge needs to replace. The fuel pump gets affected by the damaged diaphragm or one-way valves so check them and.
Mercury 40 HP outboard tune up documents Mercury 40 ELPT will no start 2004 50 HP yamaha outboard thermostste 40 mercury 4 stroke fuel pump problems mariner 40 hp lower end Jun 10 2017 MercuryMariner Fuel Pump 883202T02 883202A0 30-60 HP EFI 4 Strokes OutboardFits. Mercury Mariner Outboard Motors 2002-2006 4. If you see a reading of 40 PSI you will know that neither fuel pumps nor VST filters are clogged.
Otherwise follow the below procedures one by one and troubleshoot. Remove and Clean It takes 10 Philips head screws 3 mounting bolts and 2 bolts on the.