The engine (Yanmar 30 (actually 27 hp) )is running again. I spent an interesting evening this week scrubbing my fuel and then bleeding the engine to get it going again. A few questions: - When I tried (per the book) to prime the mechanical fuel pump by pumping the small lever up and down repeatedly, nothing happened. After quite a while, my experienced friend suggested pouring fuel directly into the pump through the bleed hole (we took the screw out) and that worked to prime the pump and get the air out. The question regards whether that reflected a common problem with the small lever/pump action, or a reflection of an inefficient approach? - That also led to two suggestions for a fix, which I would like your thoughts/experience regarding. First, I could install a new Racor with a pump attached (mine does not have one) and relocate it to the front of the engine compartment. Or, second, I could install a squeeze bulb pump (as in an outboard tank line) between the Racor and the mechanical fuel pump. Any experience with either? -- Finally, while dealing with accesss to the fuel tank, I discovered the quarter berth bunk appears to have been glassed in along the hull side. I was going to open up to search for a tank access port, but backed off. Does anyone know if this berth base which covers the tank is glassed in, or should it come loose with a tug or two? I could consider cutting a hatch through the wood to get to the tank. Ideas? Thanks Sanders SV Good News
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Terry Arnold
bleeding yanmar
Sanders, the Racor with a pump is a great solution to bleeding up to the yanmar filter. you can just open the bleed screw at the yanmar filter, then pump away back at the racor, and when it comes out at the bleed screw it's bled all the way back to the tank. On the manual lever at the fuel pump, the pump has a follower riding on an eccentric lobe so that if the follower is on the lobe, no pumping is possible. Fix for this is to turn the engine maybe half turn and try again. There is considerable movement of the manual lever when its off the lobe, very little movement when its on the lobe so with a little experience you can know at once whether the engine has to be rotated.
Sanders, the Racor with a pump is a great solution to bleeding up to the yanmar filter. you can just open the bleed screw at the yanmar filter, then pump away back at the racor, and when it comes out at the bleed screw it's bled all the way back to the tank. On the manual lever at the fuel pump, the pump has a follower riding on an eccentric lobe so that if the follower is on the lobe, no pumping is possible. Fix for this is to turn the engine maybe half turn and try again. There is considerable movement of the manual lever when its off the lobe, very little movement when its on the lobe so with a little experience you can know at once whether the engine has to be rotated.
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David Michaels
Terry, what about a single cylinder Yanmar...
...like I have on my '79 27_75-84? I beleive it's 7.5 - 8.0 HP. The person I bought the boat from spent some time explaining the bleeding process (involves opening 4 joints, pumping then closing them all in sequence) and it sounded like there should be an easier way. I'm a diesel neophyte, but I took a look at the Racor web page and the clear bottom seperator sure looks like something I should have on my boat. The engine is fine, only has about 1000 hours on it and I'm the third owner. The previous owners seemed to have taken very good care of it, and didn't use it a lot. Do your comments to Sanders also apply to me? Can I fit a Racor clear bottom seperator filter with a pump to my engine and follow the steps you outlined to bleed my system? David
...like I have on my '79 27_75-84? I beleive it's 7.5 - 8.0 HP. The person I bought the boat from spent some time explaining the bleeding process (involves opening 4 joints, pumping then closing them all in sequence) and it sounded like there should be an easier way. I'm a diesel neophyte, but I took a look at the Racor web page and the clear bottom seperator sure looks like something I should have on my boat. The engine is fine, only has about 1000 hours on it and I'm the third owner. The previous owners seemed to have taken very good care of it, and didn't use it a lot. Do your comments to Sanders also apply to me? Can I fit a Racor clear bottom seperator filter with a pump to my engine and follow the steps you outlined to bleed my system? David
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Mark M Smith
I Have one!!
I installed a bulb pump 3 years ago and it WORKS GREAT! Helps alot offshore! (When needed)! People will tell you its a mistake, but trust me its the best $3.00 you will ever spend!!!
I installed a bulb pump 3 years ago and it WORKS GREAT! Helps alot offshore! (When needed)! People will tell you its a mistake, but trust me its the best $3.00 you will ever spend!!!
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Terry Arnold
Yanmar gm series bleed similarly
David, the 1gm bleeds the same as the larger engines. The pump I was referring to is the integral pump built into some of the Racor filters. If you have space you should be able to substitute the Racor with pump for your present primary filter, (The first one you come to from the fuel tank.) Whether the high pressure lines need to be bled, which is an additional procedure, depends in my experience simply on what happened to require the bleeding in the first place. Changing filters, probably can get by with bleeding just to the yanmar filter bleed screw. Running out of fuel is going to require bleeding both low pressure system and the high pressure injection system. Below is a great post from Rip Edmundson a few months ago that is just full of good info on the Yanmars.
David, the 1gm bleeds the same as the larger engines. The pump I was referring to is the integral pump built into some of the Racor filters. If you have space you should be able to substitute the Racor with pump for your present primary filter, (The first one you come to from the fuel tank.) Whether the high pressure lines need to be bled, which is an additional procedure, depends in my experience simply on what happened to require the bleeding in the first place. Changing filters, probably can get by with bleeding just to the yanmar filter bleed screw. Running out of fuel is going to require bleeding both low pressure system and the high pressure injection system. Below is a great post from Rip Edmundson a few months ago that is just full of good info on the Yanmars.
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Ed Schenck
Re. tank.
Yes, it is glassed in. Taking the plywood cover off is just a little time consuming but not difficult. I cut two access ports in my tank, one on each side of the baffle. The location and dimensions and a lot of other discussion about H37C tanks should be in the archives. Let me know if you cannot locate it.
Yes, it is glassed in. Taking the plywood cover off is just a little time consuming but not difficult. I cut two access ports in my tank, one on each side of the baffle. The location and dimensions and a lot of other discussion about H37C tanks should be in the archives. Let me know if you cannot locate it.
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Sanders LaMont
Thanks to all
There's great information in all your answers. I'm heading for the docks in the morning and will put it all to work! If you missed it, check out the link to the Yanmar class in the answers. Really good stuff to know. Thanks again Sanders
There's great information in all your answers. I'm heading for the docks in the morning and will put it all to work! If you missed it, check out the link to the Yanmar class in the answers. Really good stuff to know. Thanks again Sanders
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