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Fuel filters 582

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5 years 8 months ago #6541 by worley
Fuel filters 582 was created by worley
I have read that Rotax suggest using two fuel filters after the fuel pump and to not use paper filters.
However, now, I can't seem to find this suggestion in our manuals or on the web.
I think it also mentioned the mesh size etc.
Can someone direct me as to where this is in print?
Thanks, Lanny

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5 years 8 months ago #6546 by billmartin
Replied by billmartin on topic Fuel filters 582
Lanny,

I have never seen filter specs for a rotax 2 cycle. The 912 specs call for a coarse filter in the tank and a fine filter downstream with a mesh size of not more than ,1mm . Most guys use the small clear plastic filters with either a sintered bronze or SS wire mesh element for the 2 cycles.. I prefer the SS mesh because it can be cleaned out and reused, you can see the trash in it, and they are only three or four bucks. A gascolator is good insurance also. It removes water in the fuel and also has a fine mesh SS screen.

Rotax does specify no paper filters.

You can check all the manuals under the support tab at the top of this page for more info.

Bill.
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5 years 8 months ago #6553 by Jiefuster
Replied by Jiefuster on topic Fuel filters 582
The one supplied by Rotax is the go in the IPC- you can pull it apart and reuse it, although with a Mr Filter as well its hardly ever got any dirt in it!
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5 years 8 months ago #6560 by nickjaxe
Replied by nickjaxe on topic Fuel filters 582
The fuel filter spec is in the 2 stroke insulation manual page 15/2 under fuel sys....its says a filter with a mesh size of 0.15mm...I could never find the mesh size details for any filter I have bought...I was always worried that to fine a filter could block very quickly.

Nick.

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5 years 8 months ago #6561 by worley
Replied by worley on topic Fuel filters 582
Thanks. It does state not to use a paper filter so I went ahead and installed a sintered porous bronze filter before each carb. and one prior to the fuel pump. The average micron rating is between 40 to 70 but not sure how that compares to 0.15 mm. I hope this is ok.
Thanks again, Kit

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5 years 8 months ago #6563 by billmartin
Replied by billmartin on topic Fuel filters 582
Lanny,

.15mm is 150 microns. 70 microns puts you well within the Rotax recommendations.

Bill.
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5 years 8 months ago #6564 by nickjaxe
Replied by nickjaxe on topic Fuel filters 582
I used to have a sintered bronze filter on my 503...my inspector told me to remove it as they can cause blockages...not sure what spec it was...it was in a round 2 piece housing around 25-300mm long and a gold colour,

Maybe at 40-70 its just to fine and wont take much to block it...just a thought,

Over here in the UK its surprising just how much crap there is in our fuel.

Nick.
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5 years 8 months ago #6567 by worley
Replied by worley on topic Fuel filters 582
Thanks, Nick
I am confused as Rotax clearly states not to use a paper filter, which came with the Quicksilver kit.
If a bronze filter caused problems I guess the only thing to use is a Stainless type. Lanny

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5 years 8 months ago #6568 by nickjaxe
Replied by nickjaxe on topic Fuel filters 582
I have no idea myself if it would cause probs but as I say I was advised not to use it as other he said had had problems...at 70 micron it seems much finer than rotax specifies,

I use this type...unfortunately I have no idea of its spec...but at least I can see the gauze.

www.ebay.co.uk/itm/Re-Cleanable-Chrome-G...&hash=item2310d8e563

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5 years 8 months ago #6569 by billmartin
Replied by billmartin on topic Fuel filters 582
I have used the SS filters like the one Nick shows and also the sintered bronze filters with good results. I wouldn't worry too much about the micron size. 150 microns is much smaller than any carb jets or galleries. Only in fuel injected engines does micron size become important. Despite the Rotax recommendation, I use paper filters in my 912S.

The Rotax recommendation is there for good reason. Never use paper filters with fiberglass fuel tanks, with older fuel lines that are not rated 30R7 or higher, or systems that have recently switched over to ethanol/mogas. Ethanol does not hurt paper filters. Millions of new cars are sold every year and they all have paper filters.

The problems usually arise when older systems have been recently switched to ethanol. The ethanol, which is a solvent, begins to loosen old deposits which will clog paper filters because they filter down in the 10-20 micron range.

I reiterate. THE ROTAX RECOMMENDATION IS WELL FOUNDED AND SHOULDN'T BE IGNORED. That being said, I prefer the paper filters because they are cheap, they are ethanol resistant, they filter much better than SS or bronze (10-20 microns), they have a huge filtering area in sq/in compared to the others, and they have a very low pressure drop across the media. All things being right with the rest of the fuel system, I have found that the paper filters are OK.

Bill.

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5 years 8 months ago #6573 by quax2000
Replied by quax2000 on topic Fuel filters 582
I also used this Type of Filter until the thread inside failed and the engine stopped.

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5 years 8 months ago #6574 by nickjaxe
Replied by nickjaxe on topic Fuel filters 582
Hans the ones we use in the UK need a modification involving fitting a spring or drilling a hole and using locking wire to stop the knurled nut coming undone,

The one in your picture look different to the ones we have in the UK..I will try and take a picture of an old one I have,

I wonder if you know what microns the gauze is by any chance.

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