thanks for this Josh Wade Oh Boy 33-2 On Sun, May 24, 2020 at 11:16 PM Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote:
> Wade, > > Look at the picture of a 500 series racor in the link below. The factory > top has a t handle which is used to tighten the lid. The vacuum gauge > which Joe linked replaces that t-handle. The t arms are not used to sense > pressure - just for tightening the lid. > https://www.ebay.com/itm/172954061164 > > BTW: these 500 series are notorious for being easily over tightened which > warps the lid and causes leaks. > > The 500 series is 60gph which would be close to 60 times the flow capacity > required for any one of our engines. Even with a 2 micron filter I would > not expect much if any vacuum being formed, though it should be noted that > the vacuum represents the effort required to "lift" the fuel out of the > tank AND the effort required to suck the fuel through the filter. Yanmar > typically rates their engines for up to 10 feet of lift. Diesel is 34" per > psi so 10 feet = ~3.5 psi. Even with no filter element installed the > vacuum for 10 feet of vertical lift of diesel fuel would amount to 100 > inH2O, 3.5psia or 7 inHg. > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > On Sun, May 24, 2020, 23:03 Wade Glew via CnC-List <cnc-list@cnc-list.com> > wrote: > >> Hi Joe >> Looking at the guage you've linked to, its obvious the "T" arms go in the >> fuel line between the Racor and engine. Where does the threaded base of the >> T go? What is a normal pressure? What pressure reading makes you decide to >> change filters? Are the lined just clamped with small hose clamps or what? >> Wade >> Oh Boy 33-2 >> >> On Sun, May 24, 2020, 17:15 Joe Della Barba via CnC-List, < >> cnc-list@cnc-list.com> wrote: >> >>> A vacuum gauge is one of the best cost/benefit ratio improvements you >>> can do. You can save a lot of $$$ in unneeded filter changes and get >>> advanced warning when you do need to change one. >>> >>> Be official: >>> >>> >>> https://www.ebay.com/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=racor+gauge&_sacat=0 >>> >>> Cockpit mount with light: >>> >>> https://moyermarine.com/product/vacuum-gauge-kit-gaug_07-1_532/ (also >>> can be used for manifold vacuum) >>> >>> Cheap: >>> >>> >>> https://www.ebay.com/itm/2-1-2-Vacuum-Gauge-Chrome-Plated-Steel-Case-1-4-NPT-Lower-Mnt-30-inHg-0/183642544745?hash=item2ac1f2da69:g:2gUAAOSwJiBcQOWz >>> >>> >>> https://www.ebay.com/itm/LIQUID-FILLED-VACUUM-GAUGE-30-0-PSI-2-5-FACE-1-4-NPT-LOWER-MOUNT-WOG/192746480989?hash=item2ce095e55d:g:RiQAAOSwqoxcBW9S >>> >>> >>> Joe Coquina C&C 35 MK I >>> >>> >>> On 5/24/2020 3:39 PM, bwhitmore via CnC-List wrote: >>> >>> Time and again I have read that Yanmar does not recommend a 2/3 micron >>> primary filter. I therefore use a 10 micron, and use Biobar, as well as >>> some Seafoam. I have some old crud in my tank, but where I can see it >>> through the hole for the sender, the bits I can see are pretty well stuck >>> to the bottom of the tank (and there are not many of them). That said, the >>> boat had sat at the dock for +/- 6 years before I got her, and we have run >>> 150 gallons or so of fuel through the boat in the last 4 years. >>> >>> I change my Racor every year, and I used to change the one on the engine >>> every year as well. This time, I'm going to let the engine mounted one go >>> another year. We still get a fine layer of black "grit" at the bottom of >>> the racor over the year, but it does not appear to hinder the running of >>> the engine. >>> >>> I'd rather swap out a $20 filter once a year than risk the engine >>> shutting down as I go through a bridge opening with 3 kts. of current. >>> >>> To each their own, >>> >>> Bruce >>> >>> >>> _______________________________________________ >>> >>> Thanks everyone for supporting this list with your contributions. Each >>> and every one is greatly appreciated. If you want to support the list - >>> use PayPal to send contribution -- https://www.paypal.me/stumurray >>> >>> _______________________________________________ >> >> Thanks everyone for supporting this list with your contributions. Each >> and every one is greatly appreciated. If you want to support the list - >> use PayPal to send contribution -- https://www.paypal.me/stumurray >> >> _______________________________________________ > > Thanks everyone for supporting this list with your contributions. Each > and every one is greatly appreciated. If you want to support the list - > use PayPal to send contribution -- https://www.paypal.me/stumurray > >
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