Re: Stus-List Yanmar 2gm fuel pump seepage
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 37+ > Solomons, MD > > > > On Thu, May 9, 2019, 11:09 AM Dave S via CnC-List > 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 > > ___ 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
Re: Stus-List Yanmar 2gm fuel pump seepage
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 37+ Solomons, MD On Thu, May 9, 2019, 11:09 AM Dave S via CnC-List 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
Re: Stus-List Yanmar 2gm fuel pump seepage
Dave, Hi, I had same problem, and while the engine continued to run OK, I was getting a lot of fuel pooling under the engine. I think the source of the leak was the gasket, not the washers. I replaced the pump. I don't know your location, but I can recommend Bay Shore Marine in Annapolis as I've had good experiences with them, on OEM stuff. They are prompt and have a large parts inventory. At the time, the only source known to me was Torresen Marine, in upper mid-west. They sent me the wrong parts, so I can't recommend them. Whatever you do, make sure you get the right size banjo washers!!! Good Luck! Pete W. C 30-2 Siren Song Deltaville, Va. Date: Thu, 9 May 2019 11:08:11 -0400 From: Dave S To: C Stus List Subject: Stus-List Yanmar 2gm fuel pump seepage Message-ID: <53ffe52b-2e67-498a-b642-39f244fe6...@gmail.com> Content-Type: text/plain; charset=utf-8 >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
Re: Stus-List Yanmar 2gm fuel pump seepage
Hi Dave, I had to replace the lift pump (might be called a transfer pump) because the diaphragm was leaking and I couldn't get a diaphragm and that cured the worst leak. Next I'm going to replace the crush washers to try and cure some minor seepage that still exists. When my lift pump was leaking you could see the drip but I was able to fit a margarine container under it to catch it for short term. Cheers, Tom S -Original Message- From: Dave S via CnC-List Sent: Thursday, May 9, 2019 11:08 AM To: C Stus List Cc: Dave S Subject: Stus-List Yanmar 2gm fuel pump seepage 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
Re: Stus-List Yanmar 2gm fuel pump seepage
First thing I would do is replace all the crush washers and see if that fixes the problem. I have had seepage for that very reason. Jim Watts Paradigm Shift C 35 Mk III Victoria, BC On Thu, 9 May 2019 at 08:09, Dave S via CnC-List 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
Stus-List Yanmar 2gm fuel pump seepage
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
