Combines 354 4 governor

It doesn't sound right. I have a 372 in my MF750, and it always shows a bit of black smoke under load, even after rebuilding. My dealer says that's normal with this Perkins family of engines. Before going into the expense of having work done on your injection system, I'd change all the fuel filters, and check to make sure there are no restrictions in the fuel lines, and that there isn't a problem with either the electric or mechanical fuel pumps. Don't forget the fuel tank screen and sediment bowl screen.

Thanks for the input. I have checked the fuel tank screen. Where is the sediment bowl locatedIJ If my 750 has one I am unaware of it. I changed fuel filters at the start og harvest but may change them again. Is there a cheap and easy way to check the mechanical fuel pumpIJ No electric pump that I have found.

It seems that there are variations between combines in production. On my 750, there is a sediment bowl threaded into the bottom of the fuel tank. Some of these have a fine screen inside, right above the glass bowl. On my 750, the fuel line from the sediment bowl, which has a shutoff valve that must be fully open, feeds the electric fuel pump, mounted on the fuel tank bracket. The mechanical fuel pump is mounted on the rear side of the engine. You check the mechanical fuel pump when you bleed your fuel filters by pumping the lever on its side. If the fuel pump cam lobe is at its highest spot, you won't be able to get any action until you rotate the engine off its high spot. There are also screens inside the mechanical fuel pump, which you can get at by taking the top off it. Check the diaphram while you're at it. A lot of 510s came without electric fuel pumps and had fuel starving problems that were solved by adding an electric fuel pump. When you turn your key on, the electric fuel pump should tick quickly at first and then slow right down. If it keeps ticking rapidly, you've probably got a hole in its diaphram. Don't forget to check that your fuel lines are clear. Disconnect at both ends, and blow out with compressed air, checking for decent air flow in the direction the fuel moves.