Fuel System Service Chapter #14.

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Presentation transcript:

Fuel System Service Chapter #14

Troubleshooting the Fuel System Identify the symptoms Speak to the customer Use troubleshooting chart

Hard Starts Spark and air? Fuel in tank? Examine plug Is fuel stale or contaminated – test fuel for ethanol % Fresh gas? Further diag. required

Checking Air-Fuel Mixture Rich Lean Flooded Check spark plug Black rich White lean Light tan - OK

Checking Gravity-Fed Fuel Supply Disconnect fuel line at carb and check for flow…

Checking Fuel Pump Disconnect fuel line at carb and check for fuel flow…

Other Checks Vacuum leaks – carb cleaner test Use a auxiliary fuel supply Vapor lock

Carburetor Adjustment Covered earlier, in carb unit…

High Speed and Idle Mixture Adjustment

Carburetor Overhaul See textbook & service information Demo… Practice…

Carburetor Removal

Carburetor Disassembly

Cleaning the Carburetor

Engine Governor Service Resetting the centrifugal governor system Adjustment Bending attachment arm – special tool Changing springs Lever clamp