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Fuel transfer/polishing pump
LaBomba182 wrote:
Subject: Fuel transfer/polishing pump From: "Doug Dotson" Makes sense, but there is quite alot of evidence out there that a polishing system is a good thing to have. I can't really increase the size of my on-engine filter. I could increase the size of the Raycor, but at the pore sizes I run (30 micron) in it make it necessary to change the on-engine filter regularly as well. Bigger Raycor won't fix the problem. What's the GPH on your engine? If you go to a larger Racor you could easily change to a smaller micron element. It fact, I have never understood why people don't run as small a micron element as they can in the first filter after the fuel tank. Why let anything near the micron size of the engine mounted filter get to that filter at all? Capt. Bill You don't want too fine a filter on the suction side. On Yanmars (and others), the lift pump can fail sooner due to the restriction. The idea is to do the cleaning in stages: 30 micron before the lift pump, 10 micron just before the high pressure pump. That said, we used 10 micron Racor elements for 8-9 seasons and 1000 hours with no significant ill effects except when we got a shot of algae. The on-engine filter never had any significant dirt on it (or in the bowl). That didn't change much when we went to 30 microns, as it happens. Note: We were able to limp home when the last filter on board clogged up during the algae incident: Pulled the filter and gently brushed junk off of the surface, and drained and cleaned the bowl (again). For a couple of hours, we could only pull half revs, but the fuel cleaned up nicely at reduced flow and (after draining the dead bodies from the bowl again) we had full power for the rest of the season. -- Jere Lull Xan-a-Deux ('73 Tanzer 28 #4 out of Tolchester, MD) Xan's Pages: http://members.dca.net/jerelull/X-Main.html Our BVI FAQs (290+ pics) http://homepage.mac.com/jerelull/BVI/ |
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