Posted by Johnd [172.69.62.14] on Sunday, May 30, 2021 at 09:23:52 :
In Reply to: 41 engine runs rough posted by art zimmer [172.68.57.76] on Saturday, May 29, 2021 at 10:21:16 :
I always want to find out if it’s a fuel or ignition problem first. I suspect a fuel problem.
Drive the truck, and when the problem develops, use your choke slowly to see if the engine runs better. If it does, it proves that the carb is starving for fuel. If so, focus on things like a clogged fuel filter or line, remove the fuel cap to see if venting is a problem. Another thing to check is if the heat riser lever is stuck. Lastly, make sure the fuel suction line from the tank to the pump is not sucking air.