E FUEL SYSTEM E 18 SERVICE DIHGNOSIS Symptoms Probable Remedy Excessive Fuel Consumption Tires improperly inflated Inflate Brakes drag l Adjust Engine operates too cold Check thermostat Heat control valve inoperative Check thermostatic spring Leak in fuel line Check all connections Carburetor float level high See Carburetor section Accelerator pump not properly adjusted Adjust Leaky fuel pump diaphragm Replace Loose engine mountings causing high carburetor fuel level Tighten Ignition timing slow or spark advance stuck See Distributor section Low compression l Check valve tappet clearance Air cleaner dirty Remove and clean Engine Hesitates on Acceleration Accelerator pump does not function perfectly Replace piston and rod or adjust Carburetor float level Adjust Spark plugs Replace or clean and adjust Low compression l Check valves Distributor points dirty or pitted Replace Weak condenser or coil Replace Carburetor jets restricted Remove and clean Excessive engine heat See Engine section Engine StaI s Won t Idle Improper condition of carburetor l See Carburetor section Low speed jet restricted Remove and clean Dirty fuel sediment bowl screen Remove and clean Air cleaner dirty l Remove and clean Leaky manifold or gasket l Replace Fuel pump diaphragm porous Replace Loose carburetor l Tighten flange nuts Water in fuel l Drain and clean system Improper ignition See Distributor section Spark plugs Clean and adjust Valves sticking Grind valves 134