cxgvd Posted June 21, 2022 Share Posted June 21, 2022 The car is a 1915 McLaughlin with the 22 HP engine. I plan to drive the car Saturday, changed the engine oil and started the engine in the garage, wouldn't settle down to a nice idle. I would describe it as bucking and snorting. I let it run to heat the engine and maybe settle down, it did not. Next day I looked at the ignition points, measured them and felt for roughness, they are good. I then took the cover off my Marvel updraft carburetor float chamber and found it dry. I opened the fuel line tap and fuel entered the chamber, though a mixture of fuel with air bubbles. I have a gravity fuel system, should be all fuel, 5/16th copper line. There is a sheet metal engine pan between the exhaust and fuel line. Regards, Gary Link to comment Share on other sites More sharing options...
billorn Posted June 21, 2022 Share Posted June 21, 2022 Pinhole in the fuel line? Fitting not tightened all the way? 3 Link to comment Share on other sites More sharing options...
Mark Shaw Posted June 22, 2022 Share Posted June 22, 2022 If the fuel filter is upstream of the vacuum tank, relocate it. The filter resitance will cause this problem especially when it gets dirty. It should be between the vacuum tank and the carb. Link to comment Share on other sites More sharing options...
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