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Woodshed

Mercruiser air filter question?

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Woodshed

My 96 Echelon LX has a 350 mercruiser with throttle body FI. I have the common problem with this engine just dying after a start on hot days when the engine has been shut down and it's hot out. Sometimes it wont start at all for a while.

It appears to be an "air" problem. So people recommend running the blower fan always. If it's bad enough I have to open the engine hood and air it out. I usually smell a burp of fumes when it finally does start.

I've only had this boat one season it only has 300 hours, but is 17 years old. I'm guessing the air filter has never been changed/cleaned. The filter is a metal mesh looking filter and it is full of grime. I'm wondering if it is restricting air flow.

questions:

1. can you clean these filters or do I need to replace it? (ie. K&N filters?)

2. Does this sound like a likely issue that could be helping my problem?

3. How often should these be cleaned or replaced?

Thanks

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tvano

sounds more like vapor lock.

search for it.

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FastFreddy

I agree/ Vapor lock.

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martinarcher

Agreed on the vapor lock.

The "air cleaner" is actually called a spark arrestor on a boat since it doesn't actually filter air, but has small slots in it that prevent backfire flame from exiting the throttle body or carb. It is best to remove it once a year and clean it from the inside out with carb cleaner or a similar solvent.

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Woodski

Vapor lock, a common problem with these boats. A solution is to insulate the fuel lines, that was also a factory fix at some point.

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Woodshed

Thanks on the correction for the spark arrestor. I didn't know that.

I read up on the vapor lock stuff. It sounds like I definately have a fuel issue. I will try some of these cheaper easy fixes (insulating the fuel lines, etc..) this spring. If that doesn't fix it, then I've heard a new fuel pump may fix it if it's got issues keeping the psi up.

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malibuparadise

Thanks on the correction for the spark arrestor. I didn't know that.

I read up on the vapor lock stuff. It sounds like I definately have a fuel issue. I will try some of these cheaper easy fixes (insulating the fuel lines, etc..) this spring. If that doesn't fix it, then I've heard a new fuel pump may fix it if it's got issues keeping the psi up.

You're learning fast!! Keep us posted.

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JB-FOOT

if you are running Ethanol blended gas in your state....I would also suggest using Startron Enzyme Ethanol treatment in EVERY gallon of gas in your boat....this stuff works

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