Clark GS200 IC Genesis Series Index:

Contents
About this Class…………………………………………………………………………………… 3
About Safety……………………………………………………………………………………….. 4
Section 1. IMPCO LPG Fuel System…………………………………………………….. 5
Engine Used……………………………………………………………………………… 5
Characteristics of LPG……………………………………………………………….. 5
Fuel Used: HD-5 Propane………………………………………………………….. 6
Function of Basic IMPCO LPG Fuel System………………………………… 7
Components of Basic IMPCO LPG Fuel System…………………………… 7
LPG Tank…………………………………………………………………………………. 8
LPG Lines…………………………………………………………………………………. 9
Hydrostatic Relief Valve…………………………………………………………….. 9
Vacuum Lines……………………………………………………………………………. 9
Water Lines………………………………………………………………………………. 9
Fuel Lock-Off Valve and Filter……………………………………………………. 9
Vaporizer-Regulator…………………………………………………………………… 11
Carburetor………………………………………………………………………………… 12
Governor…………………………………………………………………………………… 13
Maintenance of Basic IMPCO LPG Fuel System………………………….. 14
LPG Tank…………………………………………………………………………………. 14
LPG Lines…………………………………………………………………………………. 15
Hydrostatic Relief Valve…………………………………………………………….. 16
Vacuum Lines……………………………………………………………………………. 16
Coolant Lines…………………………………………………………………………….. 16
Fuel Lock-Off Valve and Filter……………………………………………………. 17
Vaporizer Regulator…………………………………………………………………… 17
Carburetor………………………………………………………………………………… 17
Throttle Linkage……………………………………………………………………….. 17
Carburator Adjustment…………………………………………………………….. 18
Governor Adjustment…………………………………………………………………. 20
Troubleshooting…………………………………………………………………………. 23
Basic Checks Before Troubleshooting the LPG Fuel System ………… 23
Checking the IMPCO System……………………………………………………… 24
Component Checking and Repair………………………………………………… 25
Bulkhead Fitting……………………………………………………………………….. 25
LP Lock-off Valve………………………………………………………………………. 26
Vaporizer-Regulator…………………………………………………………………… 28
Carburetors……………………………………………………………………………….. 30
Section 2. Gasoline Fuel System………………………………………………………….. 32
Characteristics of a Gasoline Fuel System…………………………………… 32
Components of a Gasoline Fuel System……………………………………….. 32
Mechanical Fuel Pump………………………………………………………………. 32
Electric Fuel Pump……………………………………………………………………. 32
Carburetor………………………………………………………………………………… 33
Updraft Carburetor……………………………………………………………………. 34
Downdraft Carburator……………………………………………………………….. 35

Fuel Supply System……………………………………………………………………. 36
Choke System……………………………………………………………………………. 36
The Idle System…………………………………………………………………………. 36
Fuel Cut-off Solenoid………………………………………………………………….. 36
Idle Compensator………………………………………………………………………. 37
Main Metering system……………………………………………………………….. 37
Enrichment system……………………………………………………………………. 37
Accelerating Pump System…………………………………………………………. 38
Maintenance and Troubleshooting………………………………………………. 38
Section 3.Diesel Fuel System………………………………………………………………… 41
Characteristics of a Diesel Fuel System……………………………………….. 41
Advantages of a Diesel Fuel System……………………………………………. 41
Compression Ratio…………………………………………………………………….. 42
Thermal Efficiency…………………………………………………………………….. 42
Operation of a Diesel Fuel System………………………………………………. 42
Components of a Diesel Fuel System……………………………………………. 42
Electric Fuel Transfer Pump……………………………………………………….. 42
Fuel Filter…………………………………………………………………………………. 43
Fuel Injection Pump…………………………………………………………………… 44
Distributor-Type Injection Pump…………………………………………………. 44
Injectors……………………………………………………………………………………. 45
Direct Injection………………………………………………………………………….. 45
Indirect Injection……………………………………………………………………….. 45
Maintenance and Troubleshooting………………………………………………. 46
Priming the Fuel System…………………………………………………………….. 46
Electric Fuel Transfer Pump……………………………………………………….. 48
Fuel Filter…………………………………………………………………………………. 48
Injectors…………………………………………………………………………………….. 49
Testing Injectors………………………………………………………………………… 49
Injection Pump………………………………………………………………………….. 51
Timing of Injection Pump to the Engine……………………………………….. 52
Fuel System Suction Leaks…………………………………………………………. 54
General Notes……………………………………………………………………………. 54
Section 4. Compressed Natural Gas ……………………………………………………… 55
What is Natural Gas………………………………………………………………….. 56
CNG Tank…………………………………………………………………………………. 56
Fuel Gauge………………………………………………………………………………… 57
Emergency Shut-off Valve………………………………………………………….. 57
Start Up and Shut Down Procedures…………………………………………… 58
Refueling…………………………………………………………………………………… 58
Servicing the CNG Fuel System………………………………………………….. 61
Leak Testing……………………………………………………………………………… 62
System Adjustment……………………………………………………………………. 63
Troubleshooting…………………………………………………………………………. 64