Good morning! Based on how I'm reading this and especially the last picture as well as your last paragraph, here's what I would do. Not a hard procedure. Unscrew the injection nipples that go directly into the intake manifold. Do the paper towel procedure that I described previously. Then start cranking your engine in 5 second bursts. You may need to do this a dozen times or more, but take breaks so you don't overheat the starter. That should get the rest of those stubborn air bubbles out...
Brian On Mon, Oct 5, 2020, 10:32 PM General Gao <general.z....@gmail.com> wrote: > Reporting back to my findings for today: > > This picture shows my primary filter? > > > https://drive.google.com/file/d/18tYO70bg6tTpVEifQGlXSI1ucYuvgLDq/view?usp=sharing > > this picture shows the air in the tube out of the filter: > > > https://drive.google.com/file/d/1bIr2NuR6K9nEYbwYj36OKaR4umeI2dsK/view?usp=sharing > > this picture shows the bleed valve: > > > https://drive.google.com/file/d/1umfxt0UbC81YrAxemHWuBGX3M3U-I-3V/view?usp=sharing > > When I turned on the fuel pump, the click sound was heard; I could see the > fuel in the tube move with the sound of fuel pump clicks; if I open the > bleed valve, fuel will come out of the valve in the rhythm of the fuel pump > clicks too; also, the fuel pump click sound is with faster pace if I keep > the bleed valve open. > > I am having a hard time to understand why when there is so much air in the > fuel, I still have fuel pumped out from the bleed valve at the fuel > injector? > > I will continue to check the fuel lines. Now I remember that, while I was > trying to figure out what was going on, my wife mentioned to me that she > saw air bubble going from the filter side to the engine side... > > On Mon, Oct 5, 2020 at 3:01 PM General Gao <general.z....@gmail.com> > wrote: > >> Brian, the diesel in the tank would be a couple of years old. We put >> diesel treatment every season in it though. The day before this happened, I >> added 24 liters of diesel in the marina. >> >> Bo >> >> On Sun, Oct 4, 2020 at 6:47 PM Brian Davis <brianwdavis...@gmail.com> >> wrote: >> >>> How old is the diesel in the tank, and have you ever had the tank >>> polished? >>> >>> When I recently rebuilt our Yanmar 3qm30, I changed every hose and >>> rebuilt or replaced all fuel and water pumps. >>> >>> I also had a guy come out and polish the 30 gal tank. That process was >>> cool and involved him pumping out the fuel to a filter pump and then >>> shooting it back in the tank aiming at the corners, etc. At the end, I had >>> him completely pump out everything and dispose of it. (Cost of about $325) >>> When I added the fresh diesel I also put a can of Seafoam from the auto >>> parts store which is great stuff for diesels. Then, priming and bleeding >>> took a while. But after I bled the air at the big fuel filter and then the >>> small filter on the engine, I disconnected the three fuel jets going >>> directly into the head. Then I cranked it until fuel squirted out of each >>> jet. Be sure to put a bunch of paper towels in front of each jet. That will >>> help you know that fuel is coming out without making a big mess. She runs >>> like a champ now. >>> >>> I've read the old diesel can grow fungus and of course gunk or water in >>> the fuel can make the engine stall or sputter. >>> >>> Brian >>> S/V Nina >>> 1980 Landfall 38SL >>> >>> >>> On Sun, Oct 4, 2020, 5:45 PM Josh Muckley <muckl...@gmail.com> wrote: >>> >>>> It is unlikely that fuel line down stream of the lift/priming pump is >>>> leaking to the extent that air is getting in since this section is under >>>> pressure. I would look upstream of the lift pump. This section is under >>>> vacuum. The upstream fuel filter (not the one mounted on the engine - >>>> often made by and referred to as "the racor") is very likely to be the >>>> problem. The rest of the fittings and connections rarely get disturbed but >>>> the racor does. Some racors are difficult to fully bleed and ALL of the >>>> interfaces which are disturbed during filter changes should be suspect. >>>> >>>> Rule that out and then we can talk more. >>>> >>>> In the mean time check out these videos for fuel bleeding and racor >>>> mods. >>>> >>>> https://youtu.be/F7KD1_EZmU4 >>>> >>>> https://youtu.be/H-GI38vE4hQ >>>> >>>> Josh Muckley >>>> S/V Sea Hawk >>>> 1989 C&C 37+ >>>> Solomons, MD >>>> >>>> On Sun, Oct 4, 2020, 17:24 General Gao <general.z....@gmail.com> wrote: >>>> >>>>> Hi everyone, >>>>> >>>>> Again, looking for advice from experienced sailors. >>>>> >>>>> Today on my trip, my Diesel engine stopped frequently. The last time >>>>> it stopped by itself was because air in the fuel line. I did do some more >>>>> than “usual” heeling today but the engine ran about 2 hours after that >>>>> without issue before this fuel line issue started. I checked the bleed >>>>> valve, could see that after a few seconds the fuel came out, so there was >>>>> air. The problem was that even after this, the engine still stopped >>>>> working >>>>> due to fuel supply issue like every 5-30 minutes randomly. Each time I did >>>>> the bleeding there was air. >>>>> >>>>> How can this be? Where should I look? >>>>> >>>>> Thank you in advance. >>>>> >>>>> Bo >>>>> _______________________________________________ >>>>> >>>>> 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 >>> >>> _______________________________________________ > > 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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