Fuel filter quandary - SailNet Community
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post #1 of 3 Old 06-11-2015 Thread Starter
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Fuel filter quandary

I'm unable to get the correct secondary fuel filter for my Onan down this way, the Napa Gold 3124. However I was given a Napa Gold 3358 by the Napa guy in Grenada and he says it will do.
The 3358 comes with a small gasket that fits around the threaded stem which the 3124 does not have. I contacted Napa by chat today and they could not confirm that the two were interchangeable.
Anybody have any thoughts about this?
Part Number: FIL 3358
Product Line: NAPA Gold Filters
Attributes:
Fuel Filter Gasket O.D. (Inches) : 2.74"
Fuel Filter Gasket Thickness (Inches) : .275"
Fuel Filter Height (Inches) : 4.709"
Fuel Filter O.D. (Inches) : 3.015"
Fuel Filter Style : Spin-On Fuel
Gasket I.D. (Inches) : 2.37"
Fuel Filter Gasket O.D. (mm) : 70 mm
Fuel Filter Gasket Thickness (mm) : 7 mm
Fuel Filter Height (mm) : 120 mm
Fuel Filter Inlet Thread Size (mm) : 16x1.5 mm
Fuel Filter O.D. (mm) : 77 mm
Gasket I.D. (mm) : 60 mm

Part Number: FIL 3124
Product Line: NAPA Gold Filters
Attributes:
Fuel Filter Gasket O.D. (Inches) : 2.736"
Fuel Filter Gasket Thickness (Inches) : .226"
Fuel Filter Height (Inches) : 4.828"
Fuel Filter O.D. (Inches) : 2.939"
Fuel Filter Style : Spin-on Fuel Filter
Gasket I.D. (Inches) : 2.43"
Fuel Filter Gasket O.D. (mm) : 69 mm
Fuel Filter Gasket Thickness (mm) : 6 mm
Fuel Filter Height (mm) : 123 mm
Fuel Filter Inlet Thread Size (mm) : 16x1.5 mm
Fuel Filter O.D. (mm) : 75 mm
Gasket I.D. (mm) : 62 mm

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post #2 of 3 Old 06-11-2015
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Re: Fuel filter quandary

The 3358 is 10ÁM nominal rating; 3124 is 6ÁM nominal rating; both rated for 6-8 gpm max. flowrate ... since they both have nominal ratings, no significant difference, other than the 6ÁM might 'choke' a wee bit faster in a contaminated system.
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post #3 of 3 Old 06-12-2015 Thread Starter
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Re: Fuel filter quandary

OK.
I guess a clean 10mc filter beats a dirty 6mc filter, but seeing as my Racor is a 10mc I don't see a lot of value in the 3358.
Thanks for the added info. I'll try Wix and Fram crossovers and see what their mc rating is. I don't know where you got that info; I searched for a long time and above is all I found.

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