Yanmar ysb8 injection pump

[bolin blue]

Hello all, I am hoping some one may help with some info on my yanmar ysb8 injection pump. I currently have diesel to the injection Pump but no fuel to the injector. I unscrewed the high pressure supply line to the injector and zero fuel is coming from the pump. Is my pump finished or can it be rebuilt?
Thanks
Bill

[model 10]

Well sure it can be re-built. Just like that it stopped working? That is a little weird because that's not a regular failure mode. Some sort of warning maybe?

[bolin blue]

So we were out sailing in rough weather last weeekend lots of rolling with big wind and waves. I started the engine and ran it for about a half hour then it started to bog down a bit then normal for a min then bog down, I realized we were low on fuel so I turned the engine off. I refilled the diesel tank, primed the fuel primer ball and the engine started again... a minute later it died and wouldn't start. We sailed back to the dock and left the boat for the night. Monday I replaced the 2 filters racor and engine filter then Blead and restart the engine and it fired but my helper turned it off...not to start again. I removed the fuel lifting pump and the diaphram looks fine and I have a good pulsing stream of diesel to the injection pump but no fuel after the pump, I took the line off the injector and have zero fuel! Other than the injection pump is there something else that could be causing this issue?
Thanks

[bolin blue]

Turned out to be the o-ring in the injection pump fuel supply regulator was stuck due to the rubber breaking down. It was crumbling and mushy when I took it out.
Thanks for the help.

[Wotname]

Welcome aboard CF bolin blue, glad you worked out the problem.