Holley pro-jection 2D Installation And Troubleshooting Manual - page 24
19.0 MAINTENANCE AND STORAGE
The Holley digital PRO-JECTION system is designed to give many hours of service with minimal maintenance. The following
periodic maintenance is required to ensure your continued satisfaction with the system.
1. Use a good grade of fuel. Always use a quality gasoline from a reputable service station. Pick service stations that pump
large quantities of fuel to ensure fresh gas and less contamination from underground tanks.
2. Add Holley fuel system cleaner to the gas tank every 3 months according to the directions on the system cleaner. This will
keep injector patterns optimal for best performance and economy.
3. Change both fuel filters annually or at 500 hours. Use only filters rated for high-pressure fuel injection service. The Holley
part number for the large fuel filter is 562-1.
4. To ensure safety, performance, and reliability, periodically check all fuel lines for cracks and replace as needed.
5. Be sure all electrical connections are secure and wires are away from moving parts. Apply a fresh coat of silicone dielectric
grease to all electrical terminals to help conductivity and reduce corrosion.
6. If a drop in performance is noticed, a dirty fuel filter may be the problem. Change, as required.
7. During extended periods of vessel storage (60 days or more) gasoline might deteriorate due to oxidation. This can damage
rubber and other polymers in the fuel system. It may also clog fuel injectors. A commercially available fuel stabilizer should
be added to the vessel’s fuel tank whenever actual or expected storage period exceeds 60 days. Follow the product
instructions for the amount of additive to use. The engine should be operated at idle for a minimum of ten minutes after the
addition of the stabilizer to assure that it reaches the throttle body.
20.0 TROUBLESHOOTING AND COMPONENT TESTING
Double check all wiring connections and installed components for their proper operation before replacing any parts. If you
suspect an unlikely ECU failure, check all other system components before replacing a component.
PROBLEM
POSSIBLE CAUSE
SOLUTION
A
Fuel Pump Does Not
Operate
- Open or blown fuse
- Poor ground connection
- Loose connector
- Broken or burned wire
- No power to pump from ECU
- No power to the ECU
- Faulty fuel pump
- Replace fuse
- Clean ground location and tighten
connection
- Check Connection
- Replace or repair wire
- Check for voltage and ground at the pump.
If proper voltage is present, replace the
ECU.
- Check power out from relay. Test relay and
replace, if faulty. See Testing the Power
Relay section.
- Replace the fuel pump
B
No Fuel From the
Injectors
- Open or blown fuse
- Poor ground connection
- No power to the ECU
- Loose injector harness connection
- No fuel in tank
- Low fuel pressure
- Kinked or restricted fuel line
- Fuel pump does not operate
- No TACH signal
- Faulty ECU
- Replace fuse
- Clean ground location and tighten
connection
- Check power out from relay. Test relay and
replace if faulty. See Testing the Power
Relay section.
- Inspect and clean connection, reconnect
- Add fuel to tank
- Install pressure gauges and adjust fuel
pressure. See Adjusting Fuel Pressure
section.
- Repair kinks and remove obstructions from
fuel line.
- See Item A
- Check for proper wire connection. See
Electrical Connections Section 12.0
- Replace ECU
C
Engine starts but
stalls after starter
motor disengages
- No voltage to relay switched power
input with ignition in “RUN” position
- No TACH signal
- Check switched power connection to relay
with ignition in “RUN” position
- Check for proper ignition system operation
- Check for proper wire connection. See