Detonation (Spark Knock); Preventing Gum Formation And Corrosion In The Fuel System; Electronic Fuel Injection; Flame Arrestor - Volvo Penta DPX 500 Instruction Book

Do not use any gasoline that contains METHANOL. Serious damage will result from the continued use of fuel
containing METHANOL. Any resulting engine damage will not be covered by the warranty.
If you use gasoline that contains ethanol, be aware of the following:
•
The engine will operate leaner with ethanol blended fuel. This may cause engine problems such as vapor lock,
low speed stall, or hard starting.
•
Ethanol blended fuels attract and hold moisture. Moisture inside fuel tanks can cause corrosion of the tank
material. Inspect fuel tanks at least annually. Replace fuel tanks if inspection indicates leakage or corrosion.

Detonation (spark knock)

Detonation, or spark knock, is continually monitored by the electronic fuel injection (EFI) system. The EFI's computer
(ECM) will automatically alter spark advance to help to prevent engine damage if knock is detected, and there will be
a slight loss of power.

Preventing gum formation and corrosion in the fuel system

To prevent gum formation and corrosion in the fuel system, use a fuel stabilizer in the gasoline if it has been in the
tank for more than two weeks. Fuel stabilizer is available from your Volvo Penta dealer.
Some marinas sell fuel with lead additives. Do not use leaded fuel, as it may plug the fuel injectors.
Fuel leakage can contribute to a fire and/or explosion. Frequently inspect nonmetallic parts
of the engine's fuel system and replace if excessive stiffness, deterioration, or fuel leakage
is found.
To prevent fire and explosion, perform all service procedures with the engine turned OFF.
Failure to inspect your work could allow fuel leakage to go undetected. This could become a fire or explosion
hazard. After completing service procedures, start engine and check entire fuel system for possible leaks.
To prevent fire and explosion, Volvo Penta fuel system components meet U.S. Coast Guard requirements for
fuel and fuel vapor containment. Do not substitute automotive or other non-approved parts.

Electronic fuel injection

The electronic fuel injection (EFI) fuel metering system delivers the correct
amount of fuel to the engine under all operating conditions. The EFI system is
controlled by a microprocessor, and requires no periodic maintenance or
adjustment. If operational problems occur, see your Volvo Penta dealer.

Flame arrestor

Remove the flame arrestor every 50 operating hours.
•
Clean in solvent, air dry, and inspect it for damage.
•
Replace if damaged.
•
Reinstall flame arrestor; make sure unit is securely fastened.
To prevent fire and explosion in the engine compartment, the flame
arrestor must always be in place, properly secured, and undamaged.
37