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Jan 23rd, 2013
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87 astroglass with 86 johnson 150 hp bogs down and dies #14099195 08/18/21 12:13 PM
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jla11868 Offline OP
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hey guys I could use some help I have a 87 astroglass with a 86 johnson 150hp and my boat after about 30 45 seconds at full throttle bogs down and dies the primer bulb was collapsing so i cleaned the vent tube and the pickup screen and check fuel lines for leaks and seemed to help some but still seems to do it the primer bulb did not collaps on the last run though any ideas

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14099235 08/18/21 01:03 PM
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When it starts bogging down try pressing in on the key to activate the primer/choke solenoid. If the RPM's pick back up it will indicate a fuel delivery problem. I had the same issue and it turned out to be a bad OMS fuel pump.

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14099524 08/18/21 04:12 PM
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Well Iโ€™m not looking at the boat but I would replace the fuel line and buy an OMC primer bulb to start. The inside of old fuel line can get Deteriorated and collapse in the inside. When all the new line is in, before you hook it to the motor, pump fuel into a glass jar or cup. Let it settle and see if it clean and no water. Then hook it up. And see what it does. I replaced all of mine in my 96 model boat about 13 years ago with 3/8 automotive grade line, installed a new primer bulb, and installed a fuel water separator. No fuel delivery issues since. My .02

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14101804 08/20/21 11:07 AM
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ok guys thanks i will give it a shot it does run better pushing in the choke but the bulb still collapses i am replaceing it and the fule line

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14101820 08/20/21 11:50 AM
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Originally Posted by jla11868
ok guys thanks i will give it a shot it does run better pushing in the choke but the bulb still collapses i am replaceing it and the fule line

Good start! Just in case, If you have never done it before... you will have to use your finger on the motor end of the hose to prime the fuel. Squeeze the bulb, seal the motor end w/ finger, release the bulb. Continue till fuel comes out. ๐Ÿ‘

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14102606 08/20/21 10:01 PM
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My guess is fuel lines. I had the same issue and new fuel lines did the trick.


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Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14102684 08/20/21 11:31 PM
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My 86 Johnson GT150 has a fuel filter on the left side of the motor, does yours, and if so is there any trash in it indicating that your fuel line might me deteriorating? Mine also has a vacuum switch that activates an alarm if the is an fuel line obstruction, does yours and if so does it ever go off. Any small air leak in the fuel line can cause the symptoms your describing. Are you still using the VRO/OMS fuel pump to mix the gas and oil or has it been removed/replaced? If you dont already have one, get the factory service manual for that motor, its invaluable.

Last edited by MAK747; 08/20/21 11:33 PM.
Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: MAK747] #14104276 08/22/21 05:36 PM
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i replaced the fuel filter the glass one was stripped i replaced with a 1 piece no trash in the bowl. i only get an alarm when the bulb fully collapses, the vro has been removed. i am also thinking about installing an electric fuel pump in the system i did that on another johnson 150 seahorse that i had. i am checking all the other lines to make sure there is no air leaks in them.

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14104597 08/22/21 11:47 PM
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If your primer bulb is collapsing you either are pulling a vacuum on your tank/ no vent or bad vent or your dealing with a fuel line obstruction of some kind. Bad fuel line / plugged fuel line/ bad fuel switch. If you have two tanks, that might be your issue.

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: Coolarrow] #14104841 08/23/21 11:21 AM
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i checked the vent and the main line they are clear i am checking the smaller lines on the motor next.

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14105020 08/23/21 02:17 PM
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If the bulb is collapsed the restriction is between the bulb and the tank or in the tank. It will not be on the motor side. The fuel line can look great on the outside and the lining can be all spongy and restricting flow. Especially if itโ€™s the gray fuel line.

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14115339 08/31/21 09:59 PM
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Any update?

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: Coolarrow] #14118885 09/03/21 10:37 PM
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going to lake to try it sunday i replaced the pickup tube and the complete fuel line

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14118991 09/04/21 12:57 AM
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Good luck! That fixed mine 15 years ago.

Re: 87 astroglass with 86 johnson 150 hp bogs down and dies [Re: jla11868] #14120811 09/06/21 03:54 PM
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Originally Posted by jla11868
going to lake to try it sunday i replaced the pickup tube and the complete fuel line

I hope you replaced ALL of the lines. The older lines are not rated for ethanol. I had to replace all the lines on my '86 Ranger.


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