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  1. #1
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    Fuel Problems 1997 Johnson 150 Fast Strike

    I have a 97 Ranger 354 with a Johnson 150 Fast Strike engine. My problem is: I start out and the motor starts and idles fine and I will make a 10 minute run to another area. I will stay there for 15-30 minutes and I start up to leave. When I put down the accellarator the engine acts like it is "loading up" and chocking down. It takes several tries before it catches and goes on. I had an on-lake machenic check it out a couple of months ago and he could not make it do it. He just replaced the plugs and charged me an exhorbatant amount. I have replaced the pump ball and next week, I intend to spray "Gumout" into the carbs, run some Seafoam trough it and change to gas filter. Am I doing the right things and where is the filter on this engine?

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    #2

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (wkelsay)

    Try this, when you set the boat down let it idle in neutral and prime the primer bulb before you turn it off, if it starts and runs fine after this procedure your engine is heat soaking.

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    #3

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (ELGIN)

    Thanks for the reply. I'm going back to the lake next Monday and am wanting to give this a try.
    One problem we have there around Milledgeville, Ga, Is a severe lack of good outboard machanics. There are a lot of overpriced hacks and one really good one and this time of the year, he is so busy that he hardly has time to order parts. But I do have the luxury of having another Bass Boat (16 Procraft) and if need be I can pull my Ranger out of the boathouse and onto the trailer and use it.
    One question: What is heat soaking?

  5. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #4

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (wkelsay)

    It is when the temps under the motor cowl get hot enough to cause the gas in the carbs to boil, by priming the system at idle you are introducing new cooler fuel into the system.

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    #5

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (ChampioNman)

    If it turns out to be a heat soak issue, is there a way to correct the problem?

  7. Evinrude/Johnson Motors / SC Club Moderator ChampioNman's Avatar
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    #6

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (Progator'04)

    Go night fishing. .

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    #7

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (ChampioNman)

    Or reduce under hood temps.

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    #8

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (ELGIN)

    I appreciate the humor, but if you've got a motor that is suffering from this phenomenon, you want to loosen the bolts and let the mermaids have it. I had a 1986 carbed Yammy for 20 years and didn't have this issue. If there was a way to alleviate the issue (without night fishing or replacing with a fuel injected motor), it would be greatly appreciated by all on these boards.

  10. AR Bass Club/AR Fishing Moderator GhostComanche's Avatar
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    #9

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (Progator'04)

    New thermostats and a new water pump will help with the under hood temps. ..........................RR

  11. Member
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    #10

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (The Green Hornet)

    what about cutting a colling vent on top of the cowl, install some mesh to keep the bugs out.

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    #11

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (baker1)

    My '03 150 Johnson already has vents in the top rear of the cowling.

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    #12

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (Progator'04)

    The vents need a bit more air flow but with air comes water and that does not work good inside the engine cover.

    Sorry if you thought we were being disrespectful, that was not our intent, we have seen this issue from the introduction of these engines and it shows up every year if the heat and humidity is high.

    We were just having a bit of fun, no disrespect meant.

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    #13

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (Progator'04)

    run it without the cowl, if that cures it then just open up the vents or add 'nuther.
    or an extractor fan.

    what about running without thermo's in hot weather, some guys do that in FL, never gets cold enough to be an issue.

    gotta be a way.

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    #14

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (baker1)

    I would not suggest you run the engine without thermos, two strokes don't like cold engine temps.

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    #15

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (ELGIN)

    My motor was behaving the same as yours. After a carb rebuild, new thermostats, new water pump, new gaskets and orings on the vapor separator tank and a fuel/water separator filter and about $1400.00 later, my motor runs ok. I have a 2001 Johnson 115.

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    #16

    Re: Fuel Problems 1997 Johnson 150 Fast Strike (dpoc)

    Hey Elgin, I didn't take the ribbing the wrong way! I just have not seen a response to the problem, and didn't know if there was a way around it. I really don't want to sink $1,400.00 into a heat related problem. Going to try your suggestion this weekend about pumping the bulb at idle to inject cooler gas to confirm that's what I'm dealing with. Other than that, it's a power house engine. (but it absolutely LOVES gas!)

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