Yanmar 2gm black smoke
I love this little engine! A Yanmar 2gm20 that was sitting for a few years, had a marine diesel mechanic service it, change belts and filters etc and it's run great for about 20 hours until..............my portable tank was on a slant and it sucked up air, engine stops. I've since barely got it running by bleeding the secondary filter, and bleeding the injectors. The current symptoms are very specific: Very hard start, idles fine, black smoke when revving under load, very low power, can barely move the beast!
I've little experience in such things but love the challenge of solving the problem.
Any advise would be very much appreciated!