Yamaha MCP Portable Section 6

The F/T9.9 has 3 fuel filters to help fight against fuel system contamination. 

• True

• False

Fuel stabilizer/conditioner will stabilize the octane level and keep the fuel fresh for up to: 

• 3 months 

• 9 months 

• 1 year 

• 3 weeks 

What is the maximum percentage of ethanol recommended in Yamaha outboard engines?

• 5

• 8

• 10

• 15

A 10-micron filter, installed in the boat, is the best defense against engine filter contamination. 

• True

• False

The level of fuel in the carburetors float bowl is determined by the float height. 

• True

• False

When does fuel deteriorate? 

• as soon as it leaves the refinery 

• when stored for prolonged periods of time 

• when water is mixed with ethanol in the gasoline 

• all are correct

To prevent or prolong fuel deterioration, technicians can do the following: 

• Don’t store fuel at all. 

• Mix fresh fuel with stale fuel to boost the octane. 

• Bleed the fuel system to remove air bubbles. 

• Don't store fuel at all AND mix fresh fuel with stale fuel to boost the octane

When using deteriorated fuel, the following can result EXCEPT: 

• compression ratios that are too high 

• carbon build-up 

• detonation and pre-ignition 

• boosted octane 

For long-term storage, what is the recommended mixture for fuel conditioner/stabilizer? 

• One ounce to every five gallons of fuel 

• Two ounces to every gallon of fuel 

• One ounce to every gallon of fuel 

• One ounce to every three gallons of fuel 

For continuous use, what is the recommended mixture for fuel conditioner/stabilizer? 

• One ounce to every five gallons of fuel 

• Two ounces to every gallon of fuel 

• One ounce to every gallon of fuel 

• One ounce to every three gallons of fuel