Fuel Related Problem on 1999 Johnson 150??

I have a 1999 Johnson 150 and when I first arrive at the lake I prime the bulb in the fuel line and it becomes what I would call Semi-hard. The boat runs fine on the first trip out but when I stop and fish for a while (30-40min) and I restart the engine it does not want to idle and when I put it into gear most of the time it will die also. I can throttle the engine up in neutral and somewhat "clear it out "and most of the time it will go ahead and run if I put it into gear quickly.

The boat idles at around 750 -800 rpm and will run around 65mph at around 5000 rpm on the top end.

All of the problems occur after sitting for a short while and I also have noticed somewhat of a rough idle when idling through no wake zones after the engine is warm.

I tried this week at the lake to prime the bulb when restarting the engine after sitting for a while and it seemed to help a little but not entirely.

Could this be as simple as the bulb itself?? I have inspected the fuel lines and they appear to be OK visually inspected.

Any help or ideas would be greatly appreciated. Thanks!!

Re: Fuel Related Problem on 1999 Johnson 150??

Welcome to iboats

Is this a new problem? Or is this a new motor to you?

What is the maintenance history? Carbs rebuilt? Spark plug condition? Has it been synchronized ???

Re: Fuel Related Problem on 1999 Johnson 150??

I have owned the boat for only nearly two months, I do not know what the maintenance schedule has been like, I do not know if the carbs have been rebuilt or not, and the spark plugs look clean ( I pulled them about an hour ago for a visual inspection) the entire engine looks clean from and outward visual inspection for the matter( no oil leaks or grime of leaking fuel anywhere).

I do not know about the syncronization either. Is this something that I can perform or will it have to be sent out to someone.

I do know this much the boat had new shifter and throttle cables installed recently before Purchased the boat.

Re: Fuel Related Problem on 1999 Johnson 150??

Is that idle speed in gear and in the water?

Re: Fuel Related Problem on 1999 Johnson 150??

Sitting in the driveway on muffs.

Re: Fuel Related Problem on 1999 Johnson 150??

Does anyone have any other information concerning this problem??

Also I have heard that I may need to decarb the engine and this may fix the problm, what is the proper procedure for performing a decarb?????

Re: Fuel Related Problem on 1999 Johnson 150??

5String, I have the same issue on my '98 Johnny 150HPV6. While I am waiting for a definitive solution, I have found a workaround. When I want to restart the motor, I advance the throttle to give it about a 1200 RPM idle speed and start it . Now let it run 30 sec or so, and it will usually idle fine when you return the throttle to idle.

I presume my idle mixture is a bit off, and that is what is causing the issue, but do not have any proof of that. I plan to do a Link and synch during the off season to try to track it down.