1997 Johnson 90 V-4

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danglinangler

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May 27, 2010
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5
Yesterday when coming back from fishing my boat started losing power. If I pumped the primer ball the engine ran fine. We made it back to port with my buddy occaasionally pumping the the ball when he heard the engine losing power.The engine idled fine. Any ideas? Thanks for looking. Dan
 
etracer68

etracer68

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Oct 11, 2009
Messages
906
Re: 1997 Johnson 90 V-4

It could be the fuel pump, or blockage in the fuel line, or filter. I think there is a way to check the pressure on the fuel pump. Someone else may help with this. Do you have a factory service manual?, if not, then I would get one.
 
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danglinangler

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May 27, 2010
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Re: 1997 Johnson 90 V-4

I have a service manuel. I pulled the airbox to see if I could see any leaking lines that could cause loss of suction. Everything fine. I see that the fuel filter is a screw in type. However if the filter was blocked then I doubt that the fuel could get through it even with the primer ball. I believe there is a way to check fuel pump pressure. The fuel pump is $438. If I have to replace it o.k., I just don't want to replace it and have the same problem. I'll let you know in a few days what the diagnosis is. Thanks. Dan
 
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petryshyn

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Joined
Oct 3, 2001
Messages
2,851
Re: 1997 Johnson 90 V-4

danglinangler said:
if the filter was blocked then I doubt that the fuel could get through it even with the primer ball.
Click to expand...

The primer ball can easily force fuel through a compromised filter that will hinder a fuel pump. Don't disregard the filter. You likely have a "vapor separator" on that model. Read up on the vapor pump and float system.
While it is certainly possible that the EMS pump has failed, be sure that the "supply of fuel" to it is proper before condemning it....
 
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