Generac Power Systems MAC 950F Owner's Manual page 23

Problem
Excessive Fuel Consumption
Fuel in Oil
Low-Pressure Fuel System
— Fuel Pressure Low
Owner's Manual for Flameless Air Heater
Cause
Engine overloaded
Air cleaner restricted or dirty
Compression too low
Leaks in fuel supply system
Improper type of fuel
Poor fuel quality
Improper valve clearance
Dirty or faulty fuel injectors
Electronic fuel system problem
Electronic Control System problem or
basic engine problem
Turbocharger not functioning properly
Low engine temperature
Restricted fuel return line
Engine load too light
Leaking fuel injectors
Restricted fuel filter
Restricted fuel line
Faulty transfer pump
Faulty high-pressure fuel pump
Troubleshooting
Solution
Reduce engine load
Replace air cleaner element as
required
Determine cause of low compres-
sion and repair as required
Locate source of leak and repair as
required
Drain fuel and replace with proper
grade and quality of fuel for operat-
ing condition
Drain fuel and replace with proper
grade and quality of fuel for operat-
ing condition
Adjust valve clearance or contact
an IASD
Contact an IASD
Remove and check thermostat
Check and fix fuel return lines
Increase engine load
Contact an IASD
Replace fuel filter
Locate restriction, repair as
required
Contact an IASD
Remove fuel pump, repair/replace
pump as required
19