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Old 15 June 2009, 09:21   #1
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Which racor fuel filter?

Having replaced my quicksilver filter element (35-802893Q) a month or so ago, on the 3rd use of the boat the filter is already showing signs of clogging (presumably water) so am finally going to replace it with a proper filter like a racor...

Looking at the Racor specs I have narrowed it down to 2:
- 120R with flow rate 114lph and pressure drop of 0.15psi/l
- 320R with flow rate 227lph and pressure drop of 0.61psi/l

I am looking for something that has the lowest pressure drop (least resistance) when running with max flow rate of around 60lph (just a carb based pump so not huge amount of suction). Logically I would have thought this would be the bigger of the 2 filters (overkill I know) but the specs don't seem to add up!

Anyone know where I can get a graph of pressure drop vs flow or anyone any opinions on these filters.

I was trying to get the pressure dorp / flow rate from quicksilver filter as well but can't find it spec'd anywhere! Ribcraft seem to fit these as standard so presumably will be rated for at least 150HP motor whatever flow rate that is! They just seem to clog really quickly then become difficult for engine to suck fuel through.

Thanks!
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Old 15 June 2009, 09:38   #2
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Have a look here, loads of options

http://www.asap-supplies.com/

Part no 301221 is the one I went with


They also sell the hose tails etc

Jim
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Old 15 June 2009, 11:44   #3
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Quote:
Part no 301221 is the one I went with
Ditto

Keith
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Old 15 June 2009, 15:53   #4
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Is there a table showing horsepower and fuel consumption relationship ?
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Old 15 June 2009, 19:12   #5
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http://www.tohatsu.com/tech_info/fuel_consumpt.html

This shows various models - quite useful.

My Suzuki 225 uses about 90lph though flat out.
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Old 16 June 2009, 04:51   #6
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Thanks for all the replies! 120R it is I guess!
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Old 16 June 2009, 09:43   #7
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Quote:
Originally Posted by al40 View Post
Having replaced my quicksilver filter element (35-802893Q) a month or so ago, on the 3rd use of the boat the filter is already showing signs of clogging (presumably water) so am finally going to replace it with a proper filter like a racor...

Looking at the Racor specs I have narrowed it down to 2:
- 120R with flow rate 114lph and pressure drop of 0.15psi/l
- 320R with flow rate 227lph and pressure drop of 0.61psi/l

I am looking for something that has the lowest pressure drop (least resistance) when running with max flow rate of around 60lph (just a carb based pump so not huge amount of suction). Logically I would have thought this would be the bigger of the 2 filters (overkill I know) but the specs don't seem to add up!

Anyone know where I can get a graph of pressure drop vs flow or anyone any opinions on these filters.

I was trying to get the pressure dorp / flow rate from quicksilver filter as well but can't find it spec'd anywhere! Ribcraft seem to fit these as standard so presumably will be rated for at least 150HP motor whatever flow rate that is! They just seem to clog really quickly then become difficult for engine to suck fuel through.

Thanks!
I know you know yer stuff, but I'd be looking for the source of the water, little embaressed to admit it here ,but I have a new element sitting here,I've never changed the original.

150 f/s still going to suck more than a 90 2/s and never had a problem.
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Old 16 June 2009, 11:34   #8
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Might also consider ease of finding replacement cartridges when making your decision. Go with a standard, widely used, part if at all possible.


jky
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Old 17 June 2009, 10:50   #9
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Originally Posted by IBWET View Post
I know you know yer stuff, but I'd be looking for the source of the water, little embaressed to admit it here ,but I have a new element sitting here,I've never changed the original.

150 f/s still going to suck more than a 90 2/s and never had a problem.
I think the issue is that even a little bit of water starts to significantly reduce the flow of the quicksilver filter as the wadding absorbs it then becomes less permiable to fuel. With an electric pump on the engine (which I guess yours has) then it can probably cope but a normal carb based pump doesn't seem to have enough suck.

The primer bulb may also be a restriction but tried bypassing that the last time I had issues but it didn't seem to help.

I only replaced my filter a few months back (was running on original till then) and it still passed fuel OK, just my engine (50 or 90) couldn't suck it through at WOT. Pipes are all 3/8 ID so I'm assuming the filter is the issue.....

My hope is that with the collection bowl, any water ends up in the bowl and not clogging the filter... That's the hope anyway!

I don't think there is a huge amount of water in there but with condensation, there has to be some.
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