Daves55Courier
Well-known member
Having my own problems with high fuel pressure and flooding problems, I have noticed that folks who mess with the old 223 "mileage-makers" here and on many other websites have been asking for a solution to this problem.
We all know that the problem exists due to Holley 1904 Rebuild kits with enlarged orifice in the fuel inlet fitting which delivers about 3 times the volume of fuel than the original fitting, overcoming the needle & float, thus flooding the carb.
Where the old fitting cannot be re-used, one resorts to adding a fuel pressure regulator to combat the problem. This will work for a while, but the pressure destroys the regulator eventually. I have had three different regulators, none of which lasted much longer than a year.
Have you ever noticed that the stock 223 fuel pumps have a stack of shims attached to the actuating arm?
They are riveted onto the arm. Those shims increase the stroke of the arm. I am going to remove some of those or all of them and play around with it to see if I can get the engine to run without flooding by decreasing the amount of shims on the arm.
Another thing that can be done if that is not enough is to remove the spring at the pump diaphragm and get another one with less tensile strength.
One could also just add more mounting gaskets to back the fuel pump off the engine. That would have the same effect as reducing the shim stack on the actuating arm.
More to come later, I will report what happens to those who are interested.
We all know that the problem exists due to Holley 1904 Rebuild kits with enlarged orifice in the fuel inlet fitting which delivers about 3 times the volume of fuel than the original fitting, overcoming the needle & float, thus flooding the carb.
Where the old fitting cannot be re-used, one resorts to adding a fuel pressure regulator to combat the problem. This will work for a while, but the pressure destroys the regulator eventually. I have had three different regulators, none of which lasted much longer than a year.
Have you ever noticed that the stock 223 fuel pumps have a stack of shims attached to the actuating arm?
They are riveted onto the arm. Those shims increase the stroke of the arm. I am going to remove some of those or all of them and play around with it to see if I can get the engine to run without flooding by decreasing the amount of shims on the arm.
Another thing that can be done if that is not enough is to remove the spring at the pump diaphragm and get another one with less tensile strength.
One could also just add more mounting gaskets to back the fuel pump off the engine. That would have the same effect as reducing the shim stack on the actuating arm.
More to come later, I will report what happens to those who are interested.
