Slide 1

Fuel System Service Chapter #14

Slide 2

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

Slide 3

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

Slide 4

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

Slide 5

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

Slide 6

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

Slide 7

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

Slide 8

Carburetor Adjustment Covered earlier, in carb unit

Slide 9

High Speed and Idle Mixture Adjustment

Slide 10

Carburetor Overhaul See textbook & service information Demo Practice

Slide 11

Carburetor Removal

Slide 12

Carburetor Disassembly

Slide 13

Slide 14

Cleaning the Carburetor

Slide 15

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

Slide 16