I hated how much fuel needed to be vented off my racor 200FG and it still never seemed to be completely vented. The original vent was just a knurled knob on the outlet sife fitting. It wasn't even at the highest point of the filter housing and didn't allow catching the vented fuel. I started thinking about how to maybe get a higher vent point. First I drilled and tapped a hole in the top of the housing and put a typical brake bleed type of fitting. It worked but necessitated using small tubing to direct the vented fuel into a bottle. It wasn't until I performed this mod that I realized just how much fuel needed to be vented in order to flush all the air out of the filter. I was usually looking at about 1 gallon of fuel just to get all the air out.
I started thinking about how to direct that vented fuel back to the tank. I was going to run a return fuel line when it occurred to me that the engine already has a return fuel line from the injectors. I changed the bleeder valve to a t-handle valve. Then I inserted a tee fitting and t-handled valve in the return fuel hose. Then I connected the 2 t-handled valves with some clear tubing. The 2 t-handled valves isolate the vent tubing during normal operation and maintain the integrity of the original components. When venting, both t-handled valves are openwd to create a flow path back to the tank. You can watch the air bubbles in the clear tubing disapate as the vent continues. See my video at about 2:10 minutes. https://youtu.be/H-GI38vE4hQ?t=2m12s These engines take a 2 micron engine filter and I run a 2 micron racor. The racor is now easier to change and bleed so I prefer it to clog first. I also show a vacuum gage which I installed on my racor in the video. A new racor filter has shown to have very low vacuum so whenever it starts to creep up I change it...hasn't happened yet. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Mar 30, 2017 7:18 PM, "Rick Brass via CnC-List" <cnc-list@cnc-list.com> wrote: > Depends on which filter you’re talking about. > > > > The Kabuto based Universal diesels I’ve had experience with (ditto the > Betas) are self-bleeding. So if you’re changing the 10 micron filter on the > engine, you just need to turn on the switch to activate the lift pump, and > crank the engine. It might take a few extra seconds of cranking and a bit > of throttle, but it will start. > > > > If, OTOH, you are talking about a Racor primary filter that is between the > tank and the lift pump, you do have to bleed that one. But the Racor has so > much filter area compared to the fuel flow in a small diesel that – unless > you get into a batch of bad fuel – it doesn’t need changing very often. I > think I’m on the third Racor in 14 years of owning my 38. > > > > As far as the 70-80 micron trash filter that is before the lift pump, if > you have a Racor primary filter there is no real point in replacing this > little filter. > > > > Rick Brass > > Washington, NC > > > > > > > > *From:* CnC-List [mailto:cnc-list-boun...@cnc-list.com] *On Behalf Of *David > Knecht via CnC-List > *Sent:* Thursday, March 30, 2017 8:29 AM > *To:* CnC CnC discussion list <CnC-List@cnc-list.com> > *Cc:* David Knecht <davidakne...@gmail.com> > *Subject:* Stus-List Fuel filter replacement > > > > I hate to admit this, but I am going to replace the fuel filters on my > Universal M4-30 this spring, and I have not done it before on this engine. > The manual says it has a continuous bleed system. What it doesn’t say is > what that means. Does it mean I can just replace the filters, turn on the > fuel pump and it will bleed itself so I don’t have to open any bleed > screws? If so, I want to buy a bottle of rum for whomever designed the > system. I am thinking back to the wrestling matches I had with my previous > Yanmar after changing filters. Thanks- Dave > > > > Aries > > 1990 C&C 34+ > > New London, CT > > > > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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