Generac Power Systems 65, 55, 75 manual Test 20- Check Fuel Pump, The LPG Fuel Solenoid FS

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Section 7

DIAGNOSTIC TESTS

Figure 7-13. – The LPG Fuel Solenoid (FS)

RESULTS:

1.If battery voltage is not indicated in Step 2, check Wire 15 between the Primer Switch and the 7.5 amp fuse for an open condition.

2.If battery voltage is indicated in Step 2 but not in Step 4, replace the Primer Switch. If battery voltage is NOT indicated in Step 3 repair or replace Wire 14 between the 4-tab Terminal Connector (TC) and the Fuel Primer Switch (SW2).

3.If battery voltage was indicated in Step 4 but not in Step 5:

a.For gasoline models repair or replace Wire 14A between the Primer Switch (SW2) and Fuel Pump Connector 2.

b.For LPG models repair or replace Wire 14A between the Fuel Prime Switch (SW2) and the LPG Fuel Solenoid (FS).

4.If the meter reads anything other than “Continuity” in Step 7, replace the Primer Switch.

5.If the Primer Switch checks good, go to Test 20 for Gasoline models. For LPG models, go to Test 42.

TEST 20- CHECK FUEL PUMP

DISCUSSION:

An inoperative Fuel Pump will (a) prevent the priming function from working and (b) prevent the engine from starting.

PROCEDURE:

1.Remove Fuel Filter and verify that filter is not clogged. Replace filter if necessary.

2.Verify that fuel is available to Fuel Filter inlet. Use an alterna- tive fuel supply if questionable.

3.Remove air filter access panel and air filter. Remove fuel hose from pump. Place a suitable container to catch fuel from fuel pump line. Activate fuel primer switch. Pump should operate and fuel should flow. If pump does not operate, proceed to Step 4.

4.In Test 19, Battery Voltage was checked at Connector 2. This step will test the ground wire. Disconnect Connector 2 at the Fuel Pump. Set the VOM to measure resistance. Connect one test lead to Wire 0, (Pin 1 of Connector 2) that goes to the Control Panel (see Figure 7-12). Connect the other test lead to a clean frame ground . “Continuity” should be measured.

5.To test for an open fuel pump coil, connect one test lead to the Red Wire (Pin 2 of Connector 2) going to the fuel pump. Connect the other test lead to the Black Wire (Pin 1 of Connector 2) going to the Fuel Pump (see Figure 7-15). The VOM should indicate Fuel Pump coil resistance of about 29.5 kW. (Current draw of the pump at nominal voltage is approxi- mately 1.4 amperes MAXIMUM).

Short to Ground:

6.To test for a shorted fuel pump coil, connect one test lead to the Red Wire (Pin 2 of Connector 2, see Figure 7-15). Connect the other test lead to the fuel pump housing. “Infinity” should be measured.

Figure 7-14. – Electric Fuel Pump

RESULTS:

1.If “Continuity” was not measured in Step 4, repair or replace Wire 0 between Connector 2 and the ground terminal.

2.If “Continuity” is measured in Step 4, but pump does not oper- ate in Step 3, replace the Fuel Pump.

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Contents Diagnostic Repair Manual Safety Replacement PartsTable of Contents Section Specifications & Charts Section Exploded Views / Part NumbersElectromagnetic Induction MagnetismElectromagnetic Fields Simple AC Generator More Sophisticated AC GeneratorGenerator Operating Diagram Line Breakers 120 Volts only Field BoostGenerator AC Connection System Connection for 120 Volts Only Reconnection for Dual Voltage OutputRotor Assembly Stator AssemblyExcitation Circuit Components Battery Charge ComponentsBrush Holder GeneralVoltage Regulator Adjustment ProcedureCrankcase Breather DescriptionControl Panel Component Identification Install BreatherInstall oil vapor collector and retainer Check BreatherInsulation Resistance Testers Cleaning the GeneratorEffects of Dirt and Moisture Drying the GeneratorCloth or Compressed AIR Brushing and Vacuum CleaningStator Insulation Resistance Stator SHORT-TO-GROUND TestsTesting Rotor Insulation Testing Rotor InsulationTesting Stator Insulation MegohmmeterMeasuring AC Voltage MetersVOM Measuring DC VoltageMeasuring Resistance Measuring AC FrequencyMeasuring Current Ampere Electrical UnitsOhms LAW VoltCircuit CONDITION- Rest IntroductionOperational Analysis Circuit CONDITION- Priming Circuit CONDITION- Cranking Circuit CONDITION-RUNNING Choke Heater CHCircuit CONDITION- Shutdown Circuit CONDITION- Fault Shutdown Sure Switch LOPBattery Cables BatteryRecommended Battery Engine Controller Circuit BoardAMP Fuse Fuel Primer SwitchSTART-STOP Switch Starter Contactor Relay Starter Motor Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Troubleshooting Flowcharts Test 2- Check Engine Governor ProcedureTest 1- Check NO-LOAD Voltage Frequency DiscussionTest 4- Fixed Excitation TEST/ROTOR AMP Draw Governor AdjustmentTest 3- Test Excitation Circuit Breaker If continuity was indicated, go to TestSet the VOM to measure AC voltage Test 5- Wire ContinuityRe-connect Wire 11 and Wire 22 to the Voltage Regulator Set a VOM to its Rx1 scaleIf field boost checks good, replace the Voltage Regulator Test 6- Check Field BoostTest 7 Test Stator DPE Winding 11S 22S Test 8- Check Sensing Leads / Power WindingsAcross Wires Ohms Model OhmsTest 9- Check Brush Leads Test 10 Check Brushes & Slip RingsTest 12 Check Main Circuit Breaker Test 11- Check Rotor AssemblyTance Tests Procedure Replace the Rotor if it fails the testBattery Charge Rectifier BCR is a full wave rectifier Test 15 Check Battery Charge OutputTest 16 Check Battery Charge Rectifier Test 13- Check Load Voltage Frequency10. Battery Charge Rectifier Short to GroundAlso see Fuel Primer Switch, Test 19- Test Primer SwitchSet a VOM to read battery voltage 12 VDC Test 18 TRY Cranking the EngineTest 20- Check Fuel Pump 13. The LPG Fuel Solenoid FSTest 21- Check 7.5 AMP Fuse Test 22- Check Battery & CablesTest 23- Check Power Supply to Circuit Board Test 24 Check START-STOP Switch 17. Start-Stop SwitchTest 26- Check Starter Contactor Relay Set a VOM to measure DC voltage 12 VDCConditions Affecting Starter Motor Performance Test 26A Check Starter ContactorTest 27 Check Starter Motor Measuring Current Checking the PinionTools for Starter Performance Test TachometerTest Bracket Testing Starter MotorTest 28- Check Fuel Supply Remove Starter Motor28 LP Gas Carburetion Diagram Discussion LPG ModelsBattery voltage is not measured, proceed to Step Test 29 Check Wire 14 Power SupplyTest 30 Check Wire Crank the engine. The meter should indicate battery voltageTest 31 Check Fuel Solenoid Gasoline Models Test 32 Check Ignition SparkCylinder Balance Test Conclusion No cylinder is weakest of the two cylindersTest 34 Check and Adjust Ignition Magnetos Test 33 Check Spark Plugs37. Setting Ignition Magneto Armature Air Gap Checking Flywheel Magnet Test 35 Check Valve AdjustmentAdjusting Valve Clearance Flywheel KEYTest 37 Check Choke Solenoid Install Rocker ARM CoverTest 36 Check Carburetion 43. Connector Repeat Steps 1 through 8 on remaining cylinder Adjust the regulated pressure on the gauge to 80 psiDown Test / Compression Test Check CompressionIf all steps check GOOD, go to Test Test 39 Check OIL Pressure SwitchTest 40 Test OIL Temperature Switch Short to Ground Test 41 Test Choke HeaterTest 42 Check LPG Fuel Solenoid 49. Fuel Solenoid Stator Removal Major DisassemblyENCLOSURE/PANEL Removal Rotor RemovalStarter Removal Belt TensioningEngine Removal FLYWHEEL/MAGNETO Removal Page Section Exploded Views / Part Numbers Part NO. QTY Description Enclosure Drawing No E1011-B QTY Description Sheet Metal Drawing No E1012-E QTY Description Flywheel Assy GT-990Control Panel Drawing No E1013-A Switch 6A Spdt Not Shown Wire ASM GRD STD ConnSwitch Spdt ON-MOM-ON PANEL, TOP ControlTwin Engine Drawing No E1014-B ASSEMBLY, Head #1 ASSEMBLY, Crankcase RVASSEMBLY, Breather ASSEMBLY, OIL Fill CAPLP Regulator Drawing No E1530 SOLENOID, Twin Regulator CASTING, Twin Regulator HousingWasher Flat M4 SPRING-SOLENOID PlungerSpecifications & Charts Generator Specifications Nominal Resistances of Generator Windings AT 68FEngine Speeds and Voltage Specifications Page Electrical Data Electrical Data PO BOX 297 WHITEWATER, WI

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