Lofa EP250, Operation And Troubleshooting, Page: 13 / 19

LOFA EP250 Operation and Troubleshooting
463-3000-01 Rev C.1 - 28-Feb-2007 13
Fuel Run/Stop Solenoid Troubleshooting
Engine does not stop immediately
Possible Cause Possible Remedy
Back feed from motor (i.e.,
cooling fan)
Add relay or blocking diode
Sticking solenoid linkage Repair or replace solenoid linkage
Fuel valve without check valve Install or repair check valve
Fuel run/stop solenoid does not engage
Possible Cause Possible Remedy
No power to solenoid Locate reason for lack of power and correct (Circuit overloaded? Failed
suppressor diode? Faulty wiring?)
No power to solenoid pull coil Correct faulty wiring, check pull control circuit (see Power Box
Troubleshooting below)
Incorrect linkage adjustment Adjust solenoid linkage
Faulty solenoid Replace solenoid
Failed suppressor diode Correct wiring (diode reversed?), replace suppressor diode
Optional e-stop engaged Disengage e-stop
Engine not getting fuel
Possible Cause Possible Remedy
Empty fuel tank Fuel engine
Clogged filter Replace filter
Air in fuel lines Bleed fuel lines
Low fuel pressure Replace faulty fuel pump and/or clogged filter
Faulty fuel pump Replace fuel pump, correct wiring fault (electric fuel pump)
Preheat Troubleshooting
Engine is hard to start in cold conditions
Possible Cause Possible Remedy
Start attempt before preheat
complete
Wait for preheat time to elapse, crank as soon as time elapses
Incorrect preheat specification Correct control system configuration, install correct control system
Heater faulty Replace heater
Heater relay faulty Replace relay
Preheat control not functioning Correct wiring, correct control system configuration
Faulty control system See Control System Troubleshooting (below)
Engine produces excessive white smoke after starting
Possible Cause Possible Remedy
Afterglow not enabled Reconfigure control system
Heater faulty Replace heater
Heater relay faulty Replace relay
Preheat control not functioning Correct wiring, correct control system configuration
Faulty control system See Control System Troubleshooting (below)