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1997 115 horsepower Johnson, runs very lean cold. I have a hard a time starting, the fuel lines and primer bulb seem ok.

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I have re-categorized this from chainsaws to the closest thing I could find to Johnson Marine Outboards. Let me know if this is incorrect?

Have you changed the fuel filter lately. Are there any kinks in the fuel lines. Is the automatic choke stuck? Sometimes it is just better to get a marine engineer to take a look. You don't want to burn through the top of a piston 12 miles out!

Posted on May 02, 2015


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I have a 1961 18 hp johnson that i replaced the fuel pump and fuel lines new primer bulb but seems to run the gas out of the fuel line and not geting more gas from the tank in less i sqese the bulb

There has to be a vacuum leak in your system some where. If you lose vacuum there will be no fuel flow. Check all connections and gaskets as well. There has to be air getting in somewhere. i had a new primer bulb that had an air leak and had to take it back. all it takes is a pin hole you can not see.

Apr 13, 2017 | HP Garden

1 Answer

When I pump the primer bulb, why doesn't it fill with fuel and stays collapsed?

new carbies start around $25.00 us on e-bay so get a new carby
take it to a mower shop for a service
rebuild the carby using a new carby kit

Nov 28, 2015 | Husqvarna 125 Bvx Leaf Blower Lawn Yard...

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1997 115 horsepower Johnson starts very hard cold need to prime it all over all the time to keep it running what's running for 2 minutes runs fine

Check the fuel system for flow operation and blockage / restriction. It sounds like the primer supplies enough for a couple of minutes then fails. What provides the supply after priming? Mechanical pump or electric? Check the manual.

May 02, 2015 | Cars & Trucks

2 Answers

My prime bulb looses pressure and first start is hard. I have to remove fuel line from filter and cover with thumb prime re install then first start takes time.

Does the engine run fine after it starts? Most common problem with primer bulb losing prime is an air leak in the fuel line or primer bulb. Air leaks don't always leak fuel. If there is an air leak between the primer bulb and gas tank there is no pressure, only vacuum. If it is not a major leak it might not leak without pressure but it will allow air to enter the fuel line. If it is a very minor air leak it could allow air to replace the liquid in the fuel line over time, but so little air once it is primer again that the fuel pump can over come it with volume of fuel.

Primer bulbs do not stay firm, as they are when initially pumped up, after the engine is running. There are check valves in the primer bulb that hold pressure in the primer bulb and throughout the fuel line to the engine. Once the engine starts the fuel pump creates vacuum drawing fuel into the engine diminishing this pressure and releasing the check valves. At this point the primer bulb is just another segment of fuel hose allowing fuel to pass through it as the fuel pump demands. The primer bulb functions much better when the outlet side is higher than the inlet side. This position makes it easier for the check valves in the primer bulb to seat and release as needed. If the primer bulb is functioning properly and is positioned with the outlet side higher than the inlet it should not be necessary to cover the end of the fuel hose with your thumb to get it to prime.

If the engine is hard to start after being fully primed there could be a problem with the fuel system on the engine. Some engines are hard to prime once air has entered the system, especially fuel injected models.

Dec 19, 2014 | Boating

1 Answer

How to rout fuel lines to primer bulb on poulan 14" chainsaw

Short line on primer bulb goes to the left side of the carb. The long side on the primer bulb goes to in the fuel tank as the return line.

Jul 23, 2014 | Poulan 14 in. 2.0 Peak Horsepower Electric...

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I have a 50hp johnson outboard the motor is turning over but I dont seem to get a spark to the plugs

would this help

Primary cause of hard cold start: operator error.

Open gas tank vent, pump primer bulb until it is firm, raise hi-idle lever full up, push the key in and hold it in while turning it to "start".

If you can flood your engine with the primer bulb, then your carbs need rebuilding. Pump the bulb until it is firm - that fills the carb bowls - they have a float valve that closes when full. This is true of every carbureted 2-stroke outboard ever made.

"Pumping the throttle" is useless - these are not automotive carburetors - all it does is open and close the butterfly valves.

Your motor does not have conventional choke plates; instead it has a primer solenoid, which opens a valve and allows fuel to drain into the cylinders to richen up the mixture for cold starts. You should hear the solenoid "click" when you push the key in.

Bad compression leads to hard cold starts - you should have at least 100 PSI in all cylinders, and the lowest needs to be within 5% of the highest.

If you have good compression and spark on all cylinders, the primer solenoid actuates, and the fuel line holds pressure, then you need to remove your carburetors, dissasemble, soak overnight in carb cleaner, blow out passages with compressed air (or aerosol carb cleaner), reassemble with new kits (including new o-rings, gaskets, and float valves & seats), reinstall, link & sync, and adjust slow-speed mixture

Mar 15, 2013 | Boating

1 Answer

Husqvarna 125B will start and run but once it heats up it stalls and will not start until it cools down

sounds like it's going lean lack of fuel check for cracked fuel lines,primer bulb or leaky carb to engine gasket

Aug 25, 2012 | Husqvarna Garden

1 Answer

I have a Husqvarna 455 about 2 years old. At about 1 year point it would no longer start using the primer pump button on the side when cold. If I take off the air cleaner and give it a a shot of gas down...

Your seeing the problem. Air in the fuel lines usually caused by a cracked fuel line or a pin hole in the primer bulb. Until you can stop the air bubbles by either replacing the actual primer bulb or fuel lines your always going to have the hard to start problem. This can also cause the engine to run lean at high RPM settings and eventually burn a hole in the piston. You should repair the fuel problem ASAP. If you do not find any fuel line / primer bulb problems then it is time to start looking at the carb diaphram.

Thanks for choosing FixYa,


Oct 08, 2010 | Husqvarna Chain Saw 20" Bar

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