Testing and Repair of Liquid Motor Fuel

FDNY W16 — Installation, Alteration, Testing and Repair of Liquid Motor Fuel Storage Tank and Dispensing Systems Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which of the following is the primary purpose of a spill containment

sump at a fuel dispenser island?

• Increase dispenser flow rate
• Collect and prevent spilled fuel from entering the environment
• Serve as a structural support for the dispenser
• Provide electrical grounding for the dispenser
• Collect and prevent spilled fuel from entering the environment

Rationale: Spill containment sumps are installed to capture product

spilled during refueling and prevent soil and water contamination. 1 / 4

• Which type of tank is commonly installed below grade for storing

motor fuels at service stations?

• Atmospheric aboveground tank
• Underground storage tank (UST)
• Pressurized aboveground tank
• Portable drum
• Underground storage tank (UST)

Rationale: Motor fuel stations typically use USTs to store regulated

fuels beneath the surface to save space and for safety, per common practice and regulations.

• What is the main reason for requiring overfill protection on liquid fuel

storage tanks?

• To improve fuel quality
• To prevent tank structural failure from vacuum
• To stop fuel releases and environmental contamination from

overfilling

• To increase delivery speed
• To stop fuel releases and environmental contamination from

overfilling

Rationale: Overfill protection devices (mechanical or electronic)

reduce the risk of product escape during deliveries, protecting the environment and property. 2 / 4

• When installing fuel piping, which practice reduces the chance of

corrosion between dissimilar metals?

• Using direct contact of dissimilar metals
• Using dielectric isolation fittings or compatible materials
• Painting the metals together
• Installing piping without supports
• Using dielectric isolation fittings or compatible materials

Rationale: Dielectric fittings or compatible material selection

prevents galvanic corrosion between dissimilar metals in piping systems.

• Which device provides positive indication to an operator that a tank is

near full during product delivery?

• Emergency shutoff valve
• High-level alarm or overfill prevention device
• Pressure relief valve
• Flame arrestor
• High-level alarm or overfill prevention device

Rationale: High-level alarms and overfill devices warn the

driver/operator to stop unloading before overflow occurs.

• What is the purpose of secondary containment for aboveground

piping or dispensers?

• Increase flow rate
• Confine leaks to a collectable space for inspection and cleanup 3 / 4

• Provide power distribution
• Reduce noise from pumps
• Confine leaks to a collectable space for inspection and cleanup

Rationale: Secondary containment holds leaked product to prevent

migration to the environment, providing time for detection and remediation.

• Which method is commonly used for leak detection in modern

underground storage tanks?

• Visual inspection only
• Automatic electronic leak detection systems (e.g., interstitial

monitoring)

• Tapping the tank to listen for leaks
• Using a pressure washer
• Automatic electronic leak detection systems (e.g., interstitial

monitoring)

Rationale: Electronic/leak detection systems provide continuous

monitoring for releases from tanks and piping, improving early detection.

• Before performing alterations to a motor fuel dispensing system, the

licensee must typically obtain:

• No permission is required
• Required permits and approvals from the authority having

jurisdiction (e.g., FDNY)

• / 4