Yanmar YSE8 renovation Part 11 Bleeding fuel system

Be careful so you not flood the engine with cooling water through the exhaust system!
If you need to crank the engine a lot this can happens.
The easy and safe way is to remove the belt from the water pump.
After renovation you have to fill the fuel pipe and maybe have to crank a lot.
Follow the manual for the engine, but use the start engine to bleed at the injector. After that tight the nut and hand crank the engine, then you get the sound of the injection as a confirmation that alla air is out of the system. The sound in the video is not the right one, it should be much shorter.
It's not on the video, but you should loosen the nut at the injector before you lose at the pump to bleed the delivery valve.
I have done all possible errors and here comes the list.
- Don't crank the engine until all nuts at the injection pump are tighten. If you crank you let air in.
- It's not possible to check the bleeding at the delivery valve, the pipe must be there to not let air in.
- The delivery valve (the black nut at the injection pump) must be firmly tighten. Harder than on the video.
- You need only to get some fuel out at the delivery valve. A lot and you have probably let air in.
- Listen for the small noice after you have tighten the nut at the injector and crank the engine manual (with the de-compression activated) the fuel system is air free.
- If the engine is hard to crank manual you have not decompressed it fully
- If you have had the small noice and the engine don't start something else is wrong.
- It's easy to bleed the air out. The only thing which might be hard is to fill the fuel pipe, but when you have got fuel out at the loosen nut at the injector that is ready. To hand crank to fill the pipe is near to impossible, only small drops of fuel comes at each turn of the engine.

[@Oleh12]

It helped, thank you.

[@nickscribner8448]

Wonder if you could explain in each frame which bolt you are loosening.
Hard to see where you are in the 1st couple of frames.

[@syteres]

The first is on the fine filter on the fuel line.
Second is on the entrance to the high pressure pump.
Third is on the exit of the high pressure pump.
You should also had opened the bolt on the fuel line to the injector.
Both should be open.
You have to open the third bolt a lot before the air gets out.
Tight the third.
Crank the enigine until you get clean fuel out at the injector, bolt 4.
Full trottle at all moments.
After that the engine should start.
If it's not do not work, you probably have other issues. The linkage to the high pressure pump may needs to be adjusted. If the have a new high pressure pump it may be faulty. The valves can be pitted and thus not tight.
If you need to crank a lot, remove the belt from the waterpump else you may flood the engine