In Line Fuel Filter....Marine vs Automotive???

Stumpknocker

Senior Chief Petty Officer
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Dec 11, 2003
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Just purchased an inline filter by Purolator that has the clear glass with the replaceable filter. Opened it up and it advises not to use it with outboard or marine motors. Because of the oil in the gas? Do I need a "marine" model? What would the difference be....?
 

rickdb1boat

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Jan 23, 2002
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Re: In Line Fuel Filter....Marine vs Automotive???

That type of filter element will not allow the oil to pass through with the fuel, causing a lean condition or worse.
 

Stumpknocker

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Re: In Line Fuel Filter....Marine vs Automotive???

Thanks, I advised the guy it was for an outboard motor. He said..."no problem". Right. I guess I can get one at a marina somewhere. Thanks again. <br /><br />By the way.... I have a friend that has one inline just before the engine.... 50HP Suzuki. It is an automotive filter with the pleats.... same applies here? I guess we should rip that thing out. I don't think it was on there too long before my friend purchased the motor. Hasn't run it but once.
 

Stumpknocker

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Re: In Line Fuel Filter....Marine vs Automotive???

Yes, that could be the very one except it says Purolator on the package. Why would this be different than the one at iboats? The filters appear identical. If the oil can't get through these things...where is the residue from the oil...why doesn't it clog up? The paper filter on the Suzuki 50 still looks clean.....questions...questions...
 

seahorse5

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Re: In Line Fuel Filter....Marine vs Automotive???

When fuel and oil is mixed, it's only 2% at 50:1, it will stay in suspension and cannot be separated by regular filters. Who ever told you that it could?
 

Trent

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Re: In Line Fuel Filter....Marine vs Automotive???

Man Iv used this kind of filter for years on two strokes. Never had a problem.<br />
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D

DJ

Guest
Re: In Line Fuel Filter....Marine vs Automotive???

Gil009,<br /><br />I don't think the issue is with the filter element. It has to do with the glass enclosure.<br /><br />Glass can be easily broken. If that happens, you get a fuel spill. That is bad news in a boat with a bilge.
 

Stumpknocker

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Re: In Line Fuel Filter....Marine vs Automotive???

Thanks for all the input here. I was advised on another thread that the oil would not pass through the filter of an automotive type fuel filter. The individual might have assumed I was speaking of a paper pleated filter very common in some see through filters. (maybe this would make a difference over the plastic screen type filter) I have a friend that has one (paper pleated) installed on his boat.. I wonder if I should have him take it off...<br /><br /> However, the element on this automotive Purolator looks identical to the one pictured above. The container is indeed glass and might be the reason for the warning.
 

JasonJ

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Re: In Line Fuel Filter....Marine vs Automotive???

I had an old Merc 850 that I used a Napa clear plastic filter with paper pleats. It never appeared clogged with oil, it did collect fuel tank junk. The motor always ran fine, but this thread has caused me to wonder about the paper element filters. I can't see how the paper can stop the oil, its too diluted, but I guess you never know...
 

Stumpknocker

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Re: In Line Fuel Filter....Marine vs Automotive???

Makes me wonder too. I suppose the oil has to get through, but what if it impaired the volume or made the engine run somewhat lean..... <br /><br />thoughts at 3 am that run through your head....
 

Elmer Fudge

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Re: In Line Fuel Filter....Marine vs Automotive???

I use the same filter, like Trent,i've also been doing so for years and never had a problem,but it seems that there are some questions as to whether one is premixing or not.<br />Am i correct in the assumption that these types of filters poses no danger to one's engine if they are not premixing?
 

Trent

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Re: In Line Fuel Filter....Marine vs Automotive???

Actually Elmer....Iv used these types of filters and the paper type also and never had a problem. Oil passes thru with no problem.
 

sinkingfast

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Dec 31, 2003
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Re: In Line Fuel Filter....Marine vs Automotive???

remember the auto one uses pressure to supply the fuel.. the marine type knows that it is a vaccum system therefore sucks.... the auto one could collapse and block...... be careful.
 

Forktail

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Re: In Line Fuel Filter....Marine vs Automotive???

Its not the oil. Pre-mix 2-stroke oil is soluble in gasoline and it will easily pass through the filter.<br /><br />It's not the glass. Glass filters are permitted in marine applications (although not recommended). <br /><br />And it's not the vacuum, as most outboard fuel pumps are designed with filter systems in mind and most in-line filters are directional.<br /><br />The Purolator filter isn't recommended for marine use simply because it isn't USCG approved. The USCG requires that each fuel filter or strainer be supported on the engine or boat structure, independent from its fuel line connection, unless the filter is inside a fuel tank. This would not apply to portable equipment. There are also other requirements, like the filter's hose connection must remain leak-proof if a hose clamp fails (nipples). <br /><br />Unless your outboard is portable, I would recommend using a small and inexpensive water seperating filter that mounts on the boat. Water is the number one cause of marine fuel contamination. And you could hook your quick-connect hose right to the filter system. No worries. The filter you have works, and the glass is hard to break. But I would not recommend using it.
 

andrewkafp

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Re: In Line Fuel Filter....Marine vs Automotive???

Depends what you need it for. I use Auto paper filament filters with no problems for keeping carbs clean ONLY. I use fuel stabiliser to eliminate any water or moisture in the tank.
 
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