Hi all. This is my 2d post.
I could use some help from a knowledgeable diesel user.
I've had just about no trouble with my Deere 790 with Yanmar 3-cylinder diesel since I bought it used with about 120 hours on it. It's got about 650 hours on it now. It's the first diesel engine I've ever owned.
But. It starts and runs fine when it wants to, but intermittently stalls and shows low fuel in the filter bowl. I've replaced the bowl and filter and the fuel line coming down from the tank to the bowl, and completely removed the plastic shutoff valve where the line from the tank attaches to the filter bowl. No change. The fuel level at the bowl stays right near the bottom of the bowl after it stalls. Since the bowl is well below the bottom of the fuel tank, it seems like it should be filling just by gravity feed. Unless I'm mistaken, there's a vent line going from the filter bowl unit up and into the top of the tank, so there shouldn't be any reason gravity won't fill the filter bowl. But the bowl doesn't fill and the engine won't run for more than 30 seconds or so until the tractor has sat for a while and the fuel level has gradually, very slowly, risen back up in the bowl.
If I try to restart it before the fuel level is back up in the bowl, some additional fuel is sucked into the bowl and it usually runs for a short while but the fuel comes in slow in foamy lines all around the filter bowl - not adding enough from the tank to make up for what the engine is drawing out, so it stalls within a minute or so from lack of fuel again.
After it's sat over night it will start right up and run fine, sometimes for an hour or more, until it decides not to let the filter bowl have any more fuel. And sometimes five or 10 minutes after it stalls it will start up and run fine again.
Any thoughts?
Dave B
I could use some help from a knowledgeable diesel user.
I've had just about no trouble with my Deere 790 with Yanmar 3-cylinder diesel since I bought it used with about 120 hours on it. It's got about 650 hours on it now. It's the first diesel engine I've ever owned.
But. It starts and runs fine when it wants to, but intermittently stalls and shows low fuel in the filter bowl. I've replaced the bowl and filter and the fuel line coming down from the tank to the bowl, and completely removed the plastic shutoff valve where the line from the tank attaches to the filter bowl. No change. The fuel level at the bowl stays right near the bottom of the bowl after it stalls. Since the bowl is well below the bottom of the fuel tank, it seems like it should be filling just by gravity feed. Unless I'm mistaken, there's a vent line going from the filter bowl unit up and into the top of the tank, so there shouldn't be any reason gravity won't fill the filter bowl. But the bowl doesn't fill and the engine won't run for more than 30 seconds or so until the tractor has sat for a while and the fuel level has gradually, very slowly, risen back up in the bowl.
If I try to restart it before the fuel level is back up in the bowl, some additional fuel is sucked into the bowl and it usually runs for a short while but the fuel comes in slow in foamy lines all around the filter bowl - not adding enough from the tank to make up for what the engine is drawing out, so it stalls within a minute or so from lack of fuel again.
After it's sat over night it will start right up and run fine, sometimes for an hour or more, until it decides not to let the filter bowl have any more fuel. And sometimes five or 10 minutes after it stalls it will start up and run fine again.
Any thoughts?
Dave B
