Winter Boat Fuel Maintenance: What Should You Do Before Lay-Up?

As temperatures begin to drop and the boating season comes to an end, many canal boats, narrowboats and leisure vessels will spend the next few months sitting unused.

While engines, batteries and plumbing are usually part of winter preparations, fuel tanks are often overlooked.

Winter boat fuel maintenance is just as important. Diesel can remain in a tank for months, during which water, condensation and contamination can create problems that only become apparent when the boat returns to service.

Why Does Fuel Need Attention Over Winter?

When a boat is left unused for extended periods, fuel isn’t being regularly consumed or replenished.

Changes in temperature can contribute to condensation inside the tank, while any water already present may settle at the bottom.

Water creates conditions associated with microbial contamination, commonly known as diesel bug. Over time, contamination and deposits can contribute to sludge, blocked filters and fuel-system problems.

The last thing any boat owner wants is to discover contaminated fuel when they’re ready to start cruising again.

Check Your Fuel Tank Before Winter

Before leaving your boat for the colder months, it’s worth carrying out a few basic checks:

• Check for water: Inspect and drain accumulated water from the tank where suitable drainage points are available.
• Inspect fuel filters: Check for signs of contamination, water or excessive deposits.
• Consider your fuel level: Follow your boat and tank manufacturer’s storage recommendations, balancing condensation concerns with fuel age and condition.
• Check the filler cap: Make sure seals and fittings are secure to prevent rainwater entering.
• Treat your fuel: Consider a preventative fuel conditioner to help maintain fuel condition during storage.

These simple steps can reduce the risk of returning to unexpected fuel problems in spring.

How V25 Supports Winter Fuel Protection

V25 is a highly concentrated Fuel Conditioner & Lubricity Improver designed for continuous preventative fuel management.

Its physical fuel-conditioning action helps separate water and disperse agglomerations and deposits, supporting their removal through normal drainage and filtration.

V25 also helps maintain fuel stability during storage, while supporting lubricity, injector cleanliness and cleaner combustion when the engine returns to operation.

Unlike conventional biocides, V25 doesn’t chemically kill microorganisms. Instead, it helps manage the fuel environment and the conditions associated with microbial contamination.

How Much V25 Should You Use Before Winter?

For an initial treatment or winter lay-up, Premier Fuel Solutions recommends a double dose of 1 litre per 5,000 litres of diesel.

For example:

V25 is available in convenient 100ml and 1 litre bottles, making it practical for smaller leisure boats and narrowboats.

Ideally, add V25 before your final refuelling or while the fuel can still circulate, allowing it to disperse throughout the tank before the boat is left unused.

Don’t Leave Fuel Maintenance Until Spring

A little preparation before winter can help prevent unnecessary problems when the boating season returns.

Checking for water, inspecting filters, maintaining your tank and using preventative fuel treatment are all sensible parts of winter boat fuel maintenance.

V25 provides a straightforward way to help maintain fuel condition throughout storage and support your fuel system when you’re ready to get back on the water.

One Solution From Tank to Funnel.