Wasn't sure where to post this, so I started here. I have a trencher with a Detroit 4-53 engine. It starts really hard after it's been sitting overnight, even in warm temperatures. It blows a lot of white smoke and I have to crank up the throttle and hold the key on even after it starts to fire or it will die.
It will fire pretty quickly when you first try it, but it will die if you let off the key. After you get it started and running, it starts and runs fine after being shut off.
My thought is the fuel is bleeding back to the tank after it sits. There is an inline electric fuel pump that was put on between the tank and the 1st fuel filter to address this problem. The pump is working fine. I even tried letting the pump run for about 30 sec. before starting it and that helps, but doesn't solve the problem.
There don't appear to be any check valves in the system.
I let it sit overnight and took off both fuel filters. The 1st filter (suction side) was about 80% full of fuel and the 2nd filter (pressure side) was about 50% full of fuel.
What else should I be looking for?
It will fire pretty quickly when you first try it, but it will die if you let off the key. After you get it started and running, it starts and runs fine after being shut off.
My thought is the fuel is bleeding back to the tank after it sits. There is an inline electric fuel pump that was put on between the tank and the 1st fuel filter to address this problem. The pump is working fine. I even tried letting the pump run for about 30 sec. before starting it and that helps, but doesn't solve the problem.
There don't appear to be any check valves in the system.
I let it sit overnight and took off both fuel filters. The 1st filter (suction side) was about 80% full of fuel and the 2nd filter (pressure side) was about 50% full of fuel.
What else should I be looking for?