Yamaha MCP Midrange Section 6

Gasoline blended with more than 10% ethanol is NOT recommended in Yamaha engines because ____ . 

• ethanol attracts and absorbs moisture 

• ethanol can damage fuel system components 

• ethanol can loosen particulate matter in the fuel system and contaminate the fuel 

• all are valid reasons

A special fuel pressure gauge is required to check fuel pressure if an external sensor is not being used. 

• True

• False

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

• 5

• 8

• 10

• 12

  The vapor separator tank houses the medium pressure fuel pump. 

• True

• False

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

• 
  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 options are correct

A clogged VST filter will cause a running issue. 

• True

• False

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.

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