A diesel tank water absorber is a simple, passive device placed inside a fuel tank to physically soak up and trap water so it can’t mix with your diesel, cause corrosion, or damage injectors. It’s essentially a specialized absorbent “sponge” engineered to capture a specific amount of water and then be removed and replaced once saturated.
What It Is
Check periodically and replace when saturated.
A water‑absorbing insert designed for diesel tanks (vehicles, generators, boats, storage tanks).
Usually shaped like a small pouch, sock, or cylinder.
Made from super‑absorbent polymers that selectively absorb water but not diesel fuel.
How It Works
Water naturally accumulates in diesel tanks through condensation, contaminated fuel, or long‑term storage.
The absorber is lowered into the tank using an attached retrieval cord.
As water settles at the bottom of the tank, the absorber pulls in and traps the water molecules.
Once it reaches its capacity (here, 7.2 oz), it stops absorbing and should be replaced.
Why It Matters
Water in diesel can cause:
Injector damage
Microbial growth (“diesel algae”)
Rust and corrosion
Hard starts or rough running
Fuel filter clogging
A water absorber helps prevent these issues without adding chemicals to your fuel.
Typical Use Cases
Long‑term storage tanks
Backup generators
Boats and RVs
Farm equipment
Diesel trucks that sit unused for long periods
How to Use It
Drop it into the tank through the filler neck.
Ensure the retrieval cord remains accessible.
Leave it in place during storage or operation.
More info at https://dieselcraft.com/products/
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