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CDL · Inspecting Tank Vehicles

During a tanker pre-trip inspection, what should the driver check on the tank's manhole covers and vents?

Reviewed by Jordan Morley, Editorial Lead at 247SimpleTests. Written by the 247SimpleTests Editorial Team from the official source material cited on every question.

Correct answer

That manhole covers are closed and not leaking, gaskets are in good condition, and vents are not clogged — clogged vents can cause the tank to develop pressure or vacuum and be damaged

  1. A That manhole covers are closed and not leaking, gaskets are in good condition, and vents are not clogged — clogged vents can cause the tank to develop pressure or vacuum and be damaged
  2. B Nothing — these are not driver concerns
  3. C Only that they are painted
  4. D Only the color

Why this is the answer

TANKER INSPECTION — MANHOLE COVERS AND VENTS: MANHOLE COVERS (top loading hatches): Must be CLOSED and properly secured; gaskets/seals in good condition (no leaks); covers latched correctly; leaking covers can spill product and create hazards;

Vents: Must be clear and working — vents allow air in/out as liquid level changes; a CLOGGED vent can cause: pressure buildup (as temperature rises or during loading) that can damage the tank, or a vacuum (as liquid is removed) that can collapse the tank.

Also check: tank shell for leaks, dents, corrosion; valves and connections for leaks; tank mounting/attachment; piping and hoses; for hazmat tankers, proper placarding and emergency equipment.

Special tanker items: Because the tank is the cargo container, its integrity is critical — leaks waste product and create safety/environmental hazards; proper venting prevents structural damage; tanker inspection includes all standard CMV items PLUS these tank-specific components; leaking or damaged tanks must not be driven.

Source: FMCSA CDL Manual — Tanker Inspection, Manhole Covers and Vents

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About this topic: Inspecting Tank Vehicles

The combination-vehicle inspection adds fifth wheel, kingpin, glad hands, and trailer-specific items to the standard pre-trip routine. This is one of 14 Tanker questions on inspecting tank vehicles, each with a full explanation on a single study page.

New to this exam? Our CDL exam guide explains the format, scoring, and how to prepare.

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