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Old 12-29-2021, 10:54 PM
magi magi is offline
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Proper Fuel Filter for an Atomic 4

Looking for a proper gas fuel filter for my A4. I see many filters that are for diesel and believe its a very common mistake to think you can use these with gas. Most are for outboards and not for down below in an enclosed space. USCG also does not like non-flame retardant bowls for inside use. Have to agree with them there. Any thoughts on finding a set up with a metal or glass bowl ?

Thanks All.
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Old 12-29-2021, 11:08 PM
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Moyer Marine has exactly what you're looking for:
https://moyermarine.com/product/raco...fpmp_05-1_349/
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Old 12-29-2021, 11:08 PM
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Hello magi.

Here is the filter/separator offered in the MMI catalog, which has a metal bowl:

https://moyermarine.com/product/raco...fpmp_05-1_349/

Jack.
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sastanley (12-30-2021)
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Old 12-30-2021, 12:19 AM
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Thumbs up

magi..welcome, and right on the above posts. You want the Racor 320R with the metal bowl linked above. I will comment from personal experience that it is important to lubricate the rubber gaskets for ease in later servicing.
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Old 01-01-2022, 11:41 PM
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Let me add that you should check your filters with a magnet. If a magnet sticks, they're going to rust. And the rust particles are going to go downstream toward your carb. I spent a Summer tracking down carb issues. Turned out to be due to my secondary filter (the one of last recourse) rusting and sending rusticles to the carb.
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Old 01-03-2022, 10:40 AM
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Quote:
Originally Posted by Al Schober View Post
Let me add that you should check your filters with a magnet. If a magnet sticks, they're going to rust. And the rust particles are going to go downstream toward your carb. I spent a Summer tracking down carb issues. Turned out to be due to my secondary filter (the one of last recourse) rusting and sending rusticles to the carb.
Thanks for the reminder - my secondary filter is rusting on the outside, so maybe it is inside as well.
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Old 01-04-2022, 12:31 AM
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Quote:
Originally Posted by Al Schober View Post
Let me add that you should check your filters with a magnet. If a magnet sticks, they're going to rust. And the rust particles are going to go downstream toward your carb.
Wouldn't this this apply to the primary filter as well (see Racor, Sierra, Fram etc.)? I have a primary water separating spin on filter (Sierra 18-7945), steel casing the same as several other brands and in 17 years of ownership I've never had a speck of rust but then again I change my filter regularly.

Then there's the USCG metallic construction requirement for inboard gasoline installations or said another way, no glass, plastic or see-through materials of any kind for filter or sediment bowl construction on a gas inboard.
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Old 01-04-2022, 10:09 AM
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Quote:
Originally Posted by ndutton View Post
Wouldn't this this apply to the primary filter as well (see Racor, Sierra, Fram etc.)? I have a primary water separating spin on filter (Sierra 18-7945), steel casing the same as several other brands and in 17 years of ownership I've never had a speck of rust but then again I change my filter regularly.

Then there's the USCG metallic construction requirement for inboard gasoline installations or said another way, no glass, plastic or see-through materials of any kind for filter or sediment bowl construction on a gas inboard.
I have had Racors rust on the outside. Actually that annoyed me to the point I decided to switch to Sierra filters. They cost a lot less and I replace them annually, so they never get a chance to rust.
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Old 01-04-2022, 11:28 AM
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I too use the sierra filter. They're inexpensive enough that I just replace it every spring. Never had any rust.
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Old 01-04-2022, 01:56 PM
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I agree with Ed. I got rid of the bottom-draining racor. I also use a sierra spin-on filter- just pull the whole filter and throw it away. Besides just having 1 o-ring to seal, I always worried about the drain at the bottom of the racor leaking. Yes, the drain does allow you to check for/drain water, but at 10 bucks or so per filter, I prefer to just change filters.
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Old 01-04-2022, 02:24 PM
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Quote:
Originally Posted by msmith10 View Post
I agree with Ed. I got rid of the bottom-draining racor. I also use a sierra spin-on filter- just pull the whole filter and throw it away. Besides just having 1 o-ring to seal, I always worried about the drain at the bottom of the racor leaking. Yes, the drain does allow you to check for/drain water, but at 10 bucks or so per filter, I prefer to just change filters.
If you have ethanol-gas, by the time something shows up in that drain you are in big trouble anyway and draining the filter won't solve it.
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Old 01-04-2022, 02:47 PM
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Further, my policy is filter cartridges are consumables and that includes a polishing filter (which I choose not to have).

BTW, I run on a steady diet of ethanol laced fuel (California), no problem.
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Old 01-04-2022, 04:17 PM
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Quote:
Originally Posted by ndutton View Post
Further, my policy is filter cartridges are consumables and that includes a polishing filter (which I choose not to have).

BTW, I run on a steady diet of ethanol laced fuel (California), no problem.
Ethanol gas is all we have here too. It is fine until water gets in it, filters won't fix that. A new fuel fill cap O-ring does though
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Old 01-04-2022, 08:55 PM
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Quote:
It (ethanol) is fine until water gets in it, filters won't fix that.
Exactly. I've said it before, I'm much more interested in keeping water out than dealing with it where it doesn't belong. The discussion begs the question though, why do you guys have so much rust? Leaky boats? Climate? No dehumidifiers over the winter? California boy asking.
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Old 01-05-2022, 12:19 AM
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Exactly. I've said it before, I'm much more interested in keeping water out than dealing with it where it doesn't belong. The discussion begs the question though, why do you guys have so much rust? Leaky boats? Climate? No dehumidifiers over the winter? California boy asking.
My Sierra filters don't rust in a year, I don't keep them longer than that. The polishing filter is probably ten years old at this point.
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Old 01-05-2022, 01:02 AM
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The polishing filter is probably ten years old at this point.
. . . and from what I'm reading in this thread you're not alone to some degree. I'm sorry but I don't get it. What am I missing? Why change one filter annually and not the other? Especially when it can produce exactly the contamination it's supposed to be protecting you from?

(My high school English teacher must be rolling in her grave. She preached to us in exactly these words, "A preposition is something you never end a sentence with.")
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Old 01-05-2022, 07:58 AM
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Originally Posted by ndutton View Post
. . . and from what I'm reading in this thread you're not alone to some degree. I'm sorry but I don't get it. What am I missing? Why change one filter annually and not the other? Especially when it can produce exactly the contamination it's supposed to be protecting you from?

(My high school English teacher must be rolling in her grave. She preached to us in exactly these words, "A preposition is something you never end a sentence with.")
If all goes well it shouldn't have anything in it. The major reason I have it is the smooth barbs allow one to take the carb off without sending rubber bits into the system. It has started to rust on the outside, so this thread reminded me it needs to get replaced.
I am halfway tempted to just replace the hose barb on the carb with some better kind of fitting and do without it.
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Old 01-06-2022, 09:27 PM
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Originally Posted by joe_db View Post
I am halfway tempted to just replace the hose barb on the carb with some better kind of fitting and do without it.
https://www.moyermarineforum.com/for...61&postcount=8
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Old 01-07-2022, 01:21 PM
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Thanks!
Is this the hose end?
53485K22
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Old 01-07-2022, 01:32 PM
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Yes.

Hose fitting = #53485K22 pkg qty 5
Carb fitting = #50635K373 pkg qty 1
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Old 01-07-2022, 02:22 PM
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Yes.

Hose fitting = #53485K22 pkg qty 5
Carb fitting = #50635K373 pkg qty 1
I got 5 of each, they might come in handy
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Old 01-08-2022, 10:04 AM
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Yep, one of my projects is adding them to my electric fuel pump and my spare for easy change-out.
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Old 01-08-2022, 11:06 AM
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Yep, one of my projects is adding them to my electric fuel pump and my spare for easy change-out.
I actually did that some time ago and then undid it. I used Aeroquip type lines and fittings. Then one day I was talking to the A&P while waiting to get a plane out of the shop he advised me that one, I really needed to fire-sleeve all the hoses and two that unless I had the actual Aeroquip brand it was likely the hoses would seep fuel sooner or later
All that stuff came off the next day! Now with these fittings I will have the correct marine hose that already is fire-resistant I do so hate having to cut the hoses every time I take something apart, yanking them off the barbs rips them up.
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Old 01-08-2022, 12:17 PM
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K.I.S.S.

One of my practices on ANY fuel line assembly with barb fittings is to spend some time, sanding, filing or rounding the edges on a lathe to eliminate the sharp edge of the barb but leaving the bump in a rounded smooth sealing surface that still keeps the hose from slipping. This also keeps the "NEW" hoses from being cut by the sharp barb when clamping.

This really reduces any cut fragments getting into the stream when doing an emergency R&R.

I have used many true "AN" fittings on cars, hot rods and buggies but I will not consider them for a boat in salt water. Also I don't like the braid hiding the condition of the hose or hiding a leak. I did many port on port Webber installations with the AN fittings as well as the cooling system for no other reason than "LOOKS".

Dave Neptune
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Old 01-12-2022, 08:21 PM
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Yep, one of my projects is adding them to my electric fuel pump and my spare for easy change-out.
. . . . . and DONE!
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