ABYC SYSTEMS MAIN EXAMINATION 2026 SET
QUESTIONS AND ANSWERS SURE A+
✔✔What type of threads do seacocks have? - ✔✔Straight threads.
✔✔What is gray water? - ✔✔Wastewater from showers, sinks, dishwashers, and tubs
✔✔Per ABYC TH-22, sink and shower drains should contain a ______ to stop the
ingress of carbon monoxide. - ✔✔P-trap
✔✔Ethylene glycol or propylene glycol, which one would kill you to drink? - ✔✔Ethylene
glycol.
✔✔What is the lifespan of marine sanitation hoses? - ✔✔*10 years. Inspected annually.
✔✔*What are some materials for permanent fuel storage, and which is least desirable?
- ✔✔Crosslinked polyethylene, 5000 series aluminum alloys, non-integral fiberglass
composite, mild steel(least desirable)
✔✔Where should siphon breaks/vented loops be installed? - ✔✔Above the heeled
waterline as close to center as possible.
, ✔✔When should there be a vented loop installed? - ✔✔At intake and discharge.
Wherever there is a line that exits the hull below the waterline.
✔✔In a 5000 series aluminum fuel tank, which material is appropriate for direct contact?
Which are not? - ✔✔Stainless and aluminum. Copper, brass and bronze (yellow) are
not galvanically compatible.
✔✔Which fuel tank material is subject to expansion when exposed to hydrocarbons? -
✔✔Cross-linked polyethylene.
✔✔Separation between compartment ventilation openings and fuel tank vent line
termination shall be at least _______. - ✔✔15 inches.
✔✔Fuel tanks shall be installed and restrained so that the tank does not move at the
mounting surface more than _______. - ✔✔1/4 inch
✔✔Valves or petcocks for drawing gasoline from the system ______. - ✔✔Shall not be
installed.
✔✔Grounded liquid level gauge transmitters (senders) mounted on fuel tanks shall have
the transmitter negative return conductor connected directly to: - ✔✔DC negative bus.
✔✔Metallic fuel tanks installed above flat surfaces shall be separated from the surface
by at least _____ air space when filled with fuel. - ✔✔1/4 inch.
✔✔Openings to the fuel tank shall be ______. - ✔✔At or above the topmost surface of
the tank
✔✔Individual components of the fuel system shall be capable of withstanding _______
exposure to free-burning fuel without leakage. - ✔✔2.5 minute
✔✔Fuel-fill lines shall be _____. - ✔✔Self-draining
✔✔Where shall the anti-siphon valve be installed? - ✔✔Directly after the pickup tube.
✔✔Electric fuel pumps run on ____. Why? - ✔✔Oil pressure. So they can't continue to
pump when the engine is off.
✔✔How should fuel fill hose be secured? - ✔✔2 hose clamps.
✔✔Metal fuel distribution and return lines secured to hull shall be connected to the
engine by ___________ and supported within _____ inches of this connection. - ✔✔A
flexible section; 4 inches.
QUESTIONS AND ANSWERS SURE A+
✔✔What type of threads do seacocks have? - ✔✔Straight threads.
✔✔What is gray water? - ✔✔Wastewater from showers, sinks, dishwashers, and tubs
✔✔Per ABYC TH-22, sink and shower drains should contain a ______ to stop the
ingress of carbon monoxide. - ✔✔P-trap
✔✔Ethylene glycol or propylene glycol, which one would kill you to drink? - ✔✔Ethylene
glycol.
✔✔What is the lifespan of marine sanitation hoses? - ✔✔*10 years. Inspected annually.
✔✔*What are some materials for permanent fuel storage, and which is least desirable?
- ✔✔Crosslinked polyethylene, 5000 series aluminum alloys, non-integral fiberglass
composite, mild steel(least desirable)
✔✔Where should siphon breaks/vented loops be installed? - ✔✔Above the heeled
waterline as close to center as possible.
, ✔✔When should there be a vented loop installed? - ✔✔At intake and discharge.
Wherever there is a line that exits the hull below the waterline.
✔✔In a 5000 series aluminum fuel tank, which material is appropriate for direct contact?
Which are not? - ✔✔Stainless and aluminum. Copper, brass and bronze (yellow) are
not galvanically compatible.
✔✔Which fuel tank material is subject to expansion when exposed to hydrocarbons? -
✔✔Cross-linked polyethylene.
✔✔Separation between compartment ventilation openings and fuel tank vent line
termination shall be at least _______. - ✔✔15 inches.
✔✔Fuel tanks shall be installed and restrained so that the tank does not move at the
mounting surface more than _______. - ✔✔1/4 inch
✔✔Valves or petcocks for drawing gasoline from the system ______. - ✔✔Shall not be
installed.
✔✔Grounded liquid level gauge transmitters (senders) mounted on fuel tanks shall have
the transmitter negative return conductor connected directly to: - ✔✔DC negative bus.
✔✔Metallic fuel tanks installed above flat surfaces shall be separated from the surface
by at least _____ air space when filled with fuel. - ✔✔1/4 inch.
✔✔Openings to the fuel tank shall be ______. - ✔✔At or above the topmost surface of
the tank
✔✔Individual components of the fuel system shall be capable of withstanding _______
exposure to free-burning fuel without leakage. - ✔✔2.5 minute
✔✔Fuel-fill lines shall be _____. - ✔✔Self-draining
✔✔Where shall the anti-siphon valve be installed? - ✔✔Directly after the pickup tube.
✔✔Electric fuel pumps run on ____. Why? - ✔✔Oil pressure. So they can't continue to
pump when the engine is off.
✔✔How should fuel fill hose be secured? - ✔✔2 hose clamps.
✔✔Metal fuel distribution and return lines secured to hull shall be connected to the
engine by ___________ and supported within _____ inches of this connection. - ✔✔A
flexible section; 4 inches.
