MST MST Marine Fuel Systems 3

Question 1

What is the proper way to dispose of water-contaminated fuel removed from a marine tank?

Accepted Answer

Take it to a certified hazardous waste facility or marina fuel recycler

Answer

Pour it into the bilge and pump it out

Answer

Dump it on land away from the water

Answer

Burn it off in a controlled campfire

Question 2

A fuel-injected outboard has low fuel pressure at the rail. After replacing the fuel filter, pressure is still low. What is the next component to inspect?

Accepted Answer

The electric fuel pump

Answer

The throttle position sensor

Answer

The ignition module

Answer

The tilt/trim relay

Question 3

Which federal regulation requires marine fuel tanks to be certified for use in boats?

Accepted Answer

33 CFR Part 183 (Fuel Systems)

Answer

46 CFR Part 25

Answer

40 CFR Part 86

Answer

49 CFR Part 178

Question 4

What symptom would a cracked VST (vapor separator tank) O-ring on a four-stroke EFI outboard most likely cause?

Accepted Answer

Fuel leak at the VST and possible lean run condition

Answer

Overly rich mixture and black smoke

Answer

No symptom — the O-ring is non-critical

Answer

Engine overheating

Question 5

Ethanol in marine fuel is known to degrade what common fuel system component?

Accepted Answer

Rubber fuel lines and carburetor diaphragms

Answer

Aluminum fuel tanks

Answer

Stainless steel fuel fittings

Answer

Nylon primer bulbs only

Question 6

What is the maximum EPA-allowable ethanol content in marine gasoline sold at the pump?

Accepted Answer

10% (E10)

Answer

15% (E15)

Answer

20% (E20)

Answer

85% (E85)