Boat Owner Guide

Why is my boat suddenly burning more fuel?

Short answer: The most common — and most easily fixed — cause is marine growth on the hull and propeller adding drag. As fouling builds, the engine works harder for the same speed. A cleaning usually restores fuel economy quickly.

A sudden jump in fuel burn is your boat telling you something changed. More often than not, the answer is below the waterline — and it’s good news, because it’s simple to reverse.

Drag is the usual suspect

For a boat kept in the water, growth is the most likely culprit. A fouled hull and prop create friction the engine has to overcome, so it pulls more fuel to hold the speed you’re used to. Because fouling builds gradually, owners often don’t notice until the difference at the fuel dock becomes obvious. A cleaning of the hull and running gear typically brings consumption right back down.

Other things worth checking

  • A fouled or dinged propeller, which loses efficiency and forces the engine to work harder.
  • Extra weight aboard — gear, water, and supplies add up.
  • Trim and load distribution, which change how cleanly the hull rides.
  • Engine maintenance, the right next stop if the bottom and prop are already clean.

Start below the waterline

Because hull and prop fouling is the most common cause and the easiest to rule out, it’s the smartest first move. A diver can clean the bottom, clear the running gear, and tell you exactly what the hull looked like — so you either solve the problem or cross it off the list and move on.

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