Old26Buick Posted August 28, 2023 Share Posted August 28, 2023 I have a 48 Ford that I converted to auto trans, C-4. Before I was getting 18.5 mpg. Now I am only getting 8 MPG. Have tried smaller jets in carb and doesn't rub good. Plugs fool in about 200 miles. Any ideas. thanks Link to comment Share on other sites More sharing options...
19tom40 Posted September 6, 2023 Share Posted September 6, 2023 It sound like your power valve is leaking. Fill the bowl with fuel to 11/16" below the top of the bowl and let it sit overnight with the bowl cover on. Measure the fuel level and if it dropped, the power valve or it's gasket are probably leaking. Link to comment Share on other sites More sharing options...
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