Dave: The copper washers are intended to be a single use seal, so your supposed to replace them every time you loosen a banjo bolt so maybe not the best places to bleed. I don't know if the Mcmaster-Carr ones are intended to be multi use. The fuel will harden the o-ring material if it's made from the normal Buna-N material.
All your fittings should be bone dry with no seepage. If fuel can seep out when the engine is running, it becomes possible that air will seep back in when the engine sits unused for a long time. Yanmar has sold millions of those filter housings due to people stripping them out. The nylon washer under the bleed screw makes it so it will seal effectively with a 1/4 turn past finger tight. It's not vey tight, but it does stay dry. I use the Yanmar filter as a redundant filter. The common practice is to run 25 micron element in the racor (or similar) prefilter and then have the yanmar filter the finest particles out. Instead of that, I run a larger 500 Racor with the finest 2 micron (I think) element in it. The Yanmar element I no longer change since the only contamination it will ever see is the tiny bit of dirt that may accidentally get introduced when I'm changing the Racor. The secondary benefit of this arrangement is I never need to bleed the system. (...Well OK, I do crack the bleed screw on the Yanmar it to check it, but that's me being overboard curious, never any air in there.) You turn off the fuel at the tank (keep it from flowing back when you take the lid off the racor), pull out the old filter element, drop in the new one, change the lid seal, pour a bit of diesel on top to fill the filter to the brim, put the top on, turn the fuel back on and I'm done. I think it's a good idea to do a P-M replacement of the fuel pump. Also the standard exhaust mixing elbow on that engine is problematic and should be replaced on P-M as well. Eric On Thu, May 9, 2019 at 6:38 PM Josh Muckley via CnC-List < cnc-list@cnc-list.com> wrote: > If you don't know the age of the pump it would be prudent to replace it. > It is an engine vulnerability in that when the diaphragm fails it will leak > fuel into the crankcase. > > I replaced all my copper washers with seal washers or dowdy washers > available on Amazon or McMaster Carr. > > https://youtu.be/F7KD1_EZmU4 > > Josh Muckley > S/V Sea Hawk > 1989 C&C 37+ > Solomons, MD > > > > On Thu, May 9, 2019, 11:09 AM Dave S via CnC-List <cnc-list@cnc-list.com> > wrote: > >> From both pumps oddly enough.... >> >> Lift pump seeps, appears to be gasket and or crush washers on banjo >> fitting. I’m wondering whether in addition to replacing the gaskets I >> should also replace the (still operating, likely original) pump for >> reliability’s sake. Thoughts? >> >> High pressure pump has very minor seepage as well. Can’t see what’s >> causing it. Any likely scenarios? >> >> Many thanks! >> >> Dave 33-2 >> >> Sent from my iPhone >> _______________________________________________ >> >> 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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