Troubleshooting a Carburetor Fuel System (Hyundai Accent LC)

Sign	Probable cause	Method of elimination
Unstable engine operation	Fuel mixture too lean or rich	Repair or replace the carburetor
	Fuel leaks from the retardation device	Replace
	The vacuum hose is not securely fastened	Secure the vacuum hose
	Defect in the pneumatic system for intake of heated air	Repair or replace
Unstable engine idling	The tube from the air filter is disconnected	Repair or replace
	The engine idle speed is incorrectly adjusted	Check ignition advance angle and adjust engine crankshaft speed at idle
	The air damper does not open fully	Repair or replace
	Fuel overflow in the carburetor	Repair or replace
	High or low fuel level in carburetor	Repair or replace
	The air intake pipe is clogged	Clean or replace
	The exhaust system is clogged	Replace the exhaust system
Engine operation is not controlled	The carburetor is faulty	Repair or replace
	The vacuum hose is not securely fastened	Secure the vacuum hose
	The fuel supply hose is dirty	Clean or replace
	The fuel filter is dirty or the check valve is damaged	Replace the filter
	Water in the fuel tank	Replace the check valve
	Incorrect fuel grade	Clean the filter and lines, fill with clean fuel
Reduced engine power	The catalytic converter is damaged	Replace the catalytic converter
	The air filter gasket is damaged	Replace the gasket
	The seal between the air filter housing and the carburetor is damaged	Replace the seal
	The intake manifold gasket is damaged	Replace the gasket