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
