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Where is the primer bulb on a mercury 4 stroke motor?

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  • ray gallant May 11, 2010

    need more info on this size of boat and or motor determines where it might be . some don't require a primer outboards usually have it in the fuel line .inboards use fuel pumps that are self priming



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The fuel line has an enlarged section aproximatly half way along the pipe. squese the enlarged section and wait a second or two and repeat the action untill the section becomes hard. Happy boating Timo

Posted on Apr 27, 2010


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2004 40hp mercury 4 stroke

pull the carby and clean out all of the jets
the problem most likely is not bad fuel but failing rubber components that is leaving bits of rubber in the carby and pump valves
the rubber in the hoses, primer bulb, pump diaphragm breaks down internally and lodges small particles in the filter and carby and with the age of the motor ( 12 years) now would be a good time to replace all of the rubber
unless you are familiar with the motor and carby I suggest from a safety point of view that you have the carby and work done at a service center for the make of outboard

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Your question doesn't make sense,If primer bulb is going flat you have a blockage between primer and tank.also check fuel vent on tank is open

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Gas not constant flow to enging. Have to use primer bulb and it will run another 300 yards or so on our 60 HP Mercury 4 stroke boat engine.

Check that gas line is clear, check fuel filter (if any) is unclogged, make sure gas tank is vented properly (in the old days, through the gas cap), pull float bowl and check float valve that it isn't plugged,

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1 Answer

Will not prime

The primer is a simple pump that is supposed to pull fuel through the carburetor body into the primer bulb (if this is a 2-stroke engine). On a 4-stroke engine, it pulls fuel from the tank and injects it into the carburetor. Check the bulb carefully for any cracks or holes, and check the condition of all fuel lines. The fuel filter may be plugged also. Hope this helps!

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1 Answer

Primer bulb will not ciphon fuel to carb

Two cycle engines don't prime the same way that 4 cycles do. A 4 cycle engine shoots fuel into the intake, and a two-stroke like what you have, pressurizes the carburetor and removes air. When you press it, it should harden, and then will slowly let fuel bypass the carb and go back into the fuel tank. Because of the ports and the design of a 2 stroke, shooting fuel into the intake would be bad for the engine.

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1 Answer

Can't get my Ryobi edger to start. Bought it last year. Only used it three times. Stored it for the winter. Just won't start. Is there a trick?

Is this a 2 stroke or 4 stroke motor? If 2 stroke, are you remembering to press the primer bulb before starting? When you stored it for the winter did you leave the gas in the machine? If you did, then empty the gas and refill with fresh gas.

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