MST Marine Fuel Systems Flashcards
6 cards from real MST practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 MST Marine Fuel Systems flashcards as text
What ABYC standard governs the installation of gasoline fuel systems on recreational boats?
Answer: ABYC H-24
ABYC H-24 (Gasoline Fuel Systems) establishes minimum safety standards for fuel tanks, lines, fittings, and ventilation on recreational vessels.
Why must marine carburetors have a backfire flame arrestor?
Answer: To prevent engine backfires from igniting fuel vapors in the bilge
A backfire flame arrestor stops flames from a carburetor backfire from reaching fuel vapors that may have accumulated in the engine compartment or bilge.
What is the minimum number of ventilation openings required for a gasoline-powered engine compartment per ABYC standards?
Answer: At least two — one for intake and one for exhaust
ABYC requires at least one intake and one exhaust vent to ensure adequate air circulation and dilution of fuel vapors.
Which type of fuel hose is required for use below the waterline on a marine fuel system?
Answer: USCG Type A1 (fire-resistant, non-permeating)
USCG Type A1 fuel hose is required below the waterline because it is both fire-resistant and non-permeating to prevent vapor diffusion.
What is the maximum allowable fuel tank fill rate before vapor lock or overflow becomes a risk in a portable tank system?
Answer: Fill slowly to allow vapors to escape and stop before fuel spills
Portable tanks should be filled slowly to allow vapor displacement and stopped before spilling to prevent fire and water pollution violations.
A fuel tank vented to atmosphere must discharge vapors in what location to comply with ABYC H-24?
Answer: Overboard through a vent fitting above the waterline, away from ignition sources
Fuel tank vents must terminate outboard above the waterline and be positioned away from any ignition source, opening, or air intake.