ABYC Marine Engines and Fuel Systems Certification Exam: free practice test
ABYC's engine certification for gasoline and diesel inboards, outboards, sterndrives and saildrives. It focuses on the standards for the systems engines connect to: fuel (H-24, H-25, H-33), ventilation (H-2), exhaust (P-1), electrical (E-10, E-11, E-13), controls and steering (P-14, P-17, P-21, P-28), drives (P-4, P-6) and engine cut-off (A-33). It replaced the Diesel Engines and Gasoline Engines certifications.
Watch the free 4:16 video lesson: the key ABYC Engines & Fuel Systems concepts →
Premium: 3,000 practice questions, 6 full mock exams, 800 flashcards and 60 comprehensive key notes, topic by topic. See the study path ·
- Lesson 2: Four-stroke and two-stroke cycles comparedCrank revolutions per cycle, port timing and what each design means for service.
- Lesson 3: Spark ignition versus compression ignitionHow gasoline and diesel combustion differ, and the troubleshooting each one demands.
- Lesson 4: A systematic engine troubleshooting methodFuel, air, compression and spark checked in order, using what changed last.
- Lesson 5: Working safely around running and hot enginesGuards, start lockout, hot coolant and exhaust hazards the exam expects you to know.
- Lesson 6: USCG fuel hose types and where each goesA1, A2, B1, B2 and A1-15, placement rules and the five-ounce test.
- Lesson 7: Gasoline fuel tanks: testing, labels and installationTank labels, pressure tests, mounting, and keeping tanks clear of bilge water.
- Lesson 8: Fills, vents, anti-siphon and static groundingVent sizing, fill routing, anti-siphon placement and bonding of metallic fuel parts.
- Lesson 9: Diesel fuel systems under H-33Return lines, suction-side air leaks, bleeding and filter and separator service.
- Lesson 10: Portable gasoline fuel systems under H-25Portable and semi-portable tanks, venting, connectors and safe storage rules.
- Lesson 11: Gasoline boat ventilation under H-2Natural and powered ventilation, blower sizing, labels and ignition protection.
- Lesson 12: Exhaust system design and installation under P-1Wet and dry exhaust, hose marking, risers and keeping water out of cylinders.
- Lesson 13: Carbon monoxide hazards and exhaust inspectionCO behaviour, symptoms, detectors, and what to check at every service.
- Lesson 14: Battery installation, ratings and testingE-10 securing rules, CCA and MCA, resting voltage and load testing.
- Lesson 15: Engine circuits, overcurrent protection and crankingE-11 rules for engine wiring, cranking motor exemptions and starting faults.
- Lesson 16: Alternators, charging and lithium-ion banksCharging diagnosis, belt and field faults, and E-13 battery management needs.
- Lesson 17: Raw-water and closed cooling systemsFlow paths, heat exchangers, impellers, seacocks and diagnosing overheating.
- Lesson 18: Mechanical and electronic propulsion controlsP-14 and P-28 cable travel, neutral start protection and control faults.
- Lesson 19: Mechanical and hydraulic steering systemsP-17 and P-21 installation, bleeding air and hard-over to hard-over checks.
- Lesson 20: Inboard engines, transmissions and shaftingP-4 mounting and P-6 shaft alignment, couplings and stern gear.
- Lesson 21: Emergency engine cut-off devices under A-33Design and installation rules plus the federal ECOS use requirement.
- Lesson 22: Work orders, estimates and authorizationDocumenting complaints, approvals and changes before and during repairs.
- Lesson 23: Quality control, warranty and customer communicationTesting repairs, warranty documentation and explaining findings in plain language.
Keep going after the free lesson. Every topic gets its own lesson, plus the full question bank, timed simulations and study tools.
About the ABYC Engines & Fuel Systems exam
ABYC's engine certification for gasoline and diesel inboards, outboards, sterndrives and saildrives. It focuses on the standards for the systems engines connect to: fuel (H-24, H-25, H-33), ventilation (H-2), exhaust (P-1), electrical (E-10, E-11, E-13), controls and steering (P-14, P-17, P-21, P-28), drives (P-4, P-6) and engine cut-off (A-33). It replaced the Diesel Engines and Gasoline Engines certifications.
What's on the exam
Each branch is a topic in the official outline. Members see every key fact on the full mind map. Read the free study guide →
How to pass the ABYC Engines & Fuel Systems exam
- 221 questions in 3 hours 40 minutes is about 1 minute each, the longest ABYC exam by question count.
- The cut score is 84.6%, one of the highest of the 10 ABYC exams: you can miss only about 34 questions.
- This is a standards exam more than a repair exam. ABYC says in-depth diagnostics are manufacturer specific, so expect questions on what the standards require around the engine.
- Gasoline and diesel rules differ (ignition protection, ventilation, fuel hose). When a question names the fuel, check whether the rule applies to that fuel.
Save your results and get your Readiness Score
Create a free account after the test: your score by topic, a mistakes bank, the complete study notes for the first topic, flashcards and the ABYC Numbers & Formulas Sheet.
What's in the premium ABYC Engines & Fuel Systems prep
Premium ABYC Engines & Fuel Systems prep is studied one topic at a time. Each step starts with that topic's key notes and flashcard deck, then its own question sets of 25, so you master one topic before you move to the next. When every topic is strong, the 6 full mock exams show you're ready.
Your step-by-step study path
- 1Engine Principles and Troubleshooting9 key notes, 115 flashcards, then 450 practice questions in 18 sets of 25Notes free with an account
- 2Gasoline and Diesel Fuel Systems9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 3Ventilation, Exhaust and Carbon Monoxide9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 4Engine Electrical, Batteries and Charging9 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 5Cooling Systems8 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 6Controls, Steering and Drive Systems8 key notes, 115 flashcards, then 425 practice questions in 17 sets of 25Premium
- 7Service, Quality and Customer Relations8 key notes, 110 flashcards, then 425 practice questions in 17 sets of 25Premium
- Final step: 6 full mock exams221 questions each, timed like test day. Pass them, then book your exam.Premium
Read the complete ABYC Engines & Fuel Systems study notes for “Engine Principles and Troubleshooting”
Our first full set of comprehensive notes, about 13 minutes of reading: Four-stroke and two-stroke cycles · Gasoline versus diesel · A troubleshooting method · Safety around engines, a worked exam example, the traps examiners use and a one-minute recap. Create a free account to read it and see how premium notes work before you decide.
Study tools included
3,000 practice questions
3,000 exam-style questions per exam, organized topic by topic in sets of 25. Every answer explained, with the rule it comes from.
6 full mock exams
6 full-length timed mock exams per exam, with real question counts and time limits, so test day feels like practice day.
Exam Readiness Score
One 0 to 100 number that tells you when you're ready to book. Reach 80 and you're covered by our Pass Guarantee.
800 flashcards + spaced repetition
800 flashcards per exam, in a deck for each topic, that come back right before you'd forget them. Five minutes a day keeps every number fresh.
60 comprehensive key notes
60 key notes per exam, split across its topics and each explained in full: the concepts, worked exam examples, the traps examiners use and a quick recap. Your first set is free with an account.
Mind maps
See the whole exam on one screen: every topic and the facts under it.
Sample questions with answers
These are the questions in the free test above, with answers. Try the test first. You'll learn more by getting some wrong.
1. In a four-stroke engine, how many crankshaft revolutions does one complete operating cycle (intake, compression, power, exhaust) take?
2. What ignites the fuel in a diesel engine?
3. A diesel engine ran fine, then stalled right after its fuel filter was changed and now won't restart. What's the most likely cause?
4. Why do most diesel fuel systems include a return line to the tank?
5. Why must the metallic fuel fill fitting and fuel tank of a gasoline system be grounded?
6. Before starting a gasoline inboard with powered ventilation, the required warning label tells the operator to run the blower for:
7. Why is carbon monoxide especially dangerous to people aboard?
8. A raw-water-cooled engine with a waterlift muffler is cranked repeatedly without starting. What is the risk?
9. What does a battery's cold cranking amps (CCA) rating measure?
10. A rested 12 V flooded lead-acid battery that is fully charged reads about:
11. Which conductors are exempt from ABYC E-11's requirement to have overcurrent protection near the power source?
12. An engine overheats after a winter layup, and the cooling water coming out of the exhaust is weak. What should you check first?
13. In a closed (freshwater) cooling system, how is engine heat transferred to the raw water?
14. Under US federal law since April 2021, what must the operator of a recreational boat under 26 feet that has an engine cut-off switch (ECOS) installed do?
15. What is the purpose of start-in-gear protection on a propulsion control?
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- 3,000 practice questions + 6 full mock exams per exam
- 800 flashcards + 60 key notes per exam, by topic, plus mind maps
- Spaced repetition + mistakes bank
- Readiness Score & detailed reports
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- Content updates during your access
- 5 bonuses: numbers and formulas sheet, standards map, study planner and more
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- One ABYC exam of your choice: any of the 10 certifications, from Marine Electrical to USCG Regulations
- 3,000 practice questions + 6 full mock exams per exam
- 800 flashcards + 60 key notes per exam, by topic, plus mind maps
- Spaced repetition + mistakes bank
- Readiness Score & detailed reports
- Video lessons as they release
- Content updates during your access
- 5 bonuses: numbers and formulas sheet, standards map, study planner and more
- Pass Guarantee: complete the prep, pass or 100% back
Renews once a year until you cancel. We email you before each renewal. Cancel any time from your account; you keep access until the end of the year you've paid for.
Certification guide
ABYC certification exam guide (2026): ABYC certification exams are long, all multiple choice and have high cut scores: you need 77.2% to 85% to pass, and 82.5% or more on eight of the 10. This guide covers all 10 current certifications, what they test, how they're delivered and how to prepare. All figures are from the [American Boat & Yacht Council](https://abycinc.org/education/certification-program/proctored-testing/) as of November 2026.
ABYC Engines & Fuel Systems exam FAQ
How many questions are on the ABYC Engines & Fuel Systems exam?
221 multiple-choice questions, with a time limit of 3 hours 40 minutes. Format: proctored, computer-based multiple choice; reference-material rules are not stated on the public exam pages, so confirm them when you book.
What is the passing score for ABYC Engines & Fuel Systems?
84.6% (ABYC's published cut score).
How much does the ABYC Engines & Fuel Systems exam cost?
Exam only: US$295 for ABYC members, US$595 for nonmembers, per attempt (2026). Study guide US$85 member / US$175 nonmember. Class fees vary; check ABYC's class calendar. ABYC charges members less than nonmembers, so confirm current fees with ABYC before you book.
Which languages is the ABYC Engines & Fuel Systems exam offered in?
English.
Where do I take the ABYC Engines & Fuel Systems exam?
Online with a remote proctor (webcam, microphone, Chrome, government ID, single monitor), or at the end of an ABYC certification class.
Is this ABYC Engines & Fuel Systems practice test free?
Yes. The 15-question practice test on this page is free, with an explanation for every answer and no signup. A free account also unlocks the complete study notes for the first topic. The full ABYC Engines & Fuel Systems prep is Premium at $147 a month for this exam.
What's in the premium ABYC Engines & Fuel Systems prep?
3,000 practice questions organized topic by topic (Engine Principles and Troubleshooting: 450; Gasoline and Diesel Fuel Systems: 425; Ventilation, Exhaust and Carbon Monoxide: 425; Engine Electrical, Batteries and Charging: 425; Cooling Systems: 425; Controls, Steering and Drive Systems: 425; Service, Quality and Customer Relations: 425), 6 full-length timed mock exams of 221 questions, 800 flashcards and 60 comprehensive key notes split across all 7 topics, plus a mistakes bank and the Readiness Score.
Compare ABYC Engines & Fuel Systems with the other ABYC certifications
- ABYC Marine Systems vs ABYC Engines & Fuel Systems
- ABYC Marine Electrical vs ABYC Engines & Fuel Systems
Related practice tests
ABYC Marine Electrical Certification Exam
ABYC's most widely held certification.
ABYC Marine Systems Certification Exam
The broadest ABYC certification: fuel, water, sanitation, ventilation, LPG, exhaust, thru-hulls, steering and engine controls, fire protection, air conditioning and basic electrical.
ABYC Marine Corrosion Certification Exam
For technicians and surveyors who diagnose and prevent corrosion.
Exam details are summarized from the official candidate information available in November 2026. ABYC changes formats and fees, so confirm with American Boat & Yacht Council (ABYC) before you book. ABYCExamPrep is not affiliated with the American Boat & Yacht Council.