If you have not had the tank thoroughly cleaned or replaced with a new one, I strongly urge you to stop running the engine until you do. This is especially true if you have 10% ethanol in the tank now. This fuel is an excellent solvent for the 60 year old deposits stuck to the inside of the tank. Varnish will be dissolved and introduced into your fuel pump and carburetor and then into you valve guides. This can lock up your engine. Fuel filters will not prevent this.
While inspecting the inside of the tank you may find a bunch of rust at the bottom of the tank which it restricting the flow rate of fuel enough to cause starvation while driving, yet still allowing enough fuel through to allow idling.
Last edited by 52Carl; 11/05/2019 12:30 AM.
