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#1
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Fuel Polishing again.
I am assembling my posihing system. Not clear whether it is better
to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Doug s/v Callista |
#2
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Fuel Polishing again.
Racor strongly recommends that filters be operated under vacuum rather
than pressure. I believe the idea being safety. Better for a leak to pull in air than spray fuel. Doug Dotson wrote: I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Doug s/v Callista -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
#3
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Fuel Polishing again.
Racor strongly recommends that filters be operated under vacuum rather
than pressure. I believe the idea being safety. Better for a leak to pull in air than spray fuel. Doug Dotson wrote: I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Doug s/v Callista -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
#4
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Fuel Polishing again.
Interesting. More tradeoffs. I have been told (by Rich H) that filters
last longer in pressure mode. I'm not using Raycor but I'm sure the issues are similar. I've also been advised that operating the engine fuel system in pressure mode is better because a leak will not kill the engine, just leak some fuel. I'd never consider such an approach with a gasoline engine, but with a diesel the risk seems acceptable. I had a minor leak this summer and enfed up with a couple gallons of bilge in the catch pan under the engine. No real danger although a pain to clean up. Doug s/v Callista "Glenn Ashmore" wrote in message news:rL%Kb.29544$JD6.12079@lakeread04... Racor strongly recommends that filters be operated under vacuum rather than pressure. I believe the idea being safety. Better for a leak to pull in air than spray fuel. Doug Dotson wrote: I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Doug s/v Callista -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
#5
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Fuel Polishing again.
Interesting. More tradeoffs. I have been told (by Rich H) that filters
last longer in pressure mode. I'm not using Raycor but I'm sure the issues are similar. I've also been advised that operating the engine fuel system in pressure mode is better because a leak will not kill the engine, just leak some fuel. I'd never consider such an approach with a gasoline engine, but with a diesel the risk seems acceptable. I had a minor leak this summer and enfed up with a couple gallons of bilge in the catch pan under the engine. No real danger although a pain to clean up. Doug s/v Callista "Glenn Ashmore" wrote in message news:rL%Kb.29544$JD6.12079@lakeread04... Racor strongly recommends that filters be operated under vacuum rather than pressure. I believe the idea being safety. Better for a leak to pull in air than spray fuel. Doug Dotson wrote: I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Doug s/v Callista -- Glenn Ashmore I'm building a 45' cutter in strip/composite. Watch my progress (or lack there of) at: http://www.rutuonline.com Shameless Commercial Division: http://www.spade-anchor-us.com |
#6
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Fuel Polishing again.
On Wed, 7 Jan 2004 17:16:45 -0500, "Doug Dotson"
wrote: I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Probably better to have the pump suck clean fuel through the filters than force dirty fuel through. Steve |
#7
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Fuel Polishing again.
On Wed, 7 Jan 2004 17:16:45 -0500, "Doug Dotson"
wrote: I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Probably better to have the pump suck clean fuel through the filters than force dirty fuel through. Steve |
#8
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Fuel Polishing again.
Doug Dotson wrote:
I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. You want to avoid having the pump act as an homogenizer. If the pump takes suction directly from the tank it will thoroughly mix all the water and crud that you want to filter out. This makes it much more difficult to remove in the filters. The Racors operate best on the suction side because the separator section of the filter will, when it receives one, deposit a clean slug of water in the bowl rather than clog the filter media with an emulsion created by the pump. Rick |
#9
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Fuel Polishing again.
Doug Dotson wrote:
I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. You want to avoid having the pump act as an homogenizer. If the pump takes suction directly from the tank it will thoroughly mix all the water and crud that you want to filter out. This makes it much more difficult to remove in the filters. The Racors operate best on the suction side because the separator section of the filter will, when it receives one, deposit a clean slug of water in the bowl rather than clog the filter media with an emulsion created by the pump. Rick |
#10
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Fuel Polishing again.
That's why one of my thoughts is to put the pump between
the filters. 10 uM upstream, 1 uM downstream. Doug s/v Callista "Steven Shelikoff" wrote in message ... On Wed, 7 Jan 2004 17:16:45 -0500, "Doug Dotson" wrote: I am assembling my posihing system. Not clear whether it is better to put the pump on the pressure side or the vacuum side. Having no filter on the intake of the pump seems risky. I am using a 2 stage approach. maybe putting the filter between the filters is an option. Probably better to have the pump suck clean fuel through the filters than force dirty fuel through. Steve |
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