Attwood Marine Deck Fill for Carbon Canister System, 1-1/2 in Hose, EPA/CARB, Dual 1 PSI Relief Valves, 4-18 GPM Auto Shutoff

Overview

The Attwood Marine 99DFCC Series is a deck fill for marine fuel systems that use a certified carbon canister for evaporative emission control. It is part of Attwood's carbon canister system deck fill range and is made for boats where the fuel fill, venting and vapor-control layout need to work together safely.

The unit fits 1-1/2 in (38 mm) I.D. fill hose and installs through a 2-1/4 in (57 mm) deck opening. The body is non-metallic plastic, so bonding and grounding are not required, and the latched cap is water-resistant for exposed deck locations. Dual overpressure relief valves are built into the cap to help protect the fuel system from accidental over-pressurization.

Key features

• 99DFCC Series deck fill for fuel systems using a certified carbon canister.
• Fits 1-1/2 in (38 mm) I.D. fill hose for common marine fuel-fill layouts.
• Requires a 2-1/4 in (57 mm) deck cutout and works with deck thickness up to 1/2 in (13 mm).
• Non-metallic plastic construction eliminates the need for bonding or grounding at the deck fill.
• Latched cap is water-resistant, which helps in deck areas exposed to spray and washdowns.
• Dual overpressure relief valves in the cap help reduce the risk of accidental fuel-system over-pressurization.
• Meets ISO 10080, ABYC and USCG requirements for the deck fill component.
• Available with angled or straight body styles and scalloped cap finishes to match the installation location and deck hardware look.

Variants

The range varies by body style and cap finish. Body style options are angled or straight, and cap options include black plastic, chrome and stainless steel, each with a scalloped cap profile.

All variants belong to the same 99DFCC deck-fill family, but the body style affects how the fill neck sits in relation to the deck surface. The angled version is useful where the deck angle or hose routing needs a different approach, while the straight version suits installations where the fill hose can run below the deck without forcing the hose into a tight bend.

Installation and fit

Mount the deck fill on a flat surface where spilled fuel cannot enter the boat. The space below the deck must allow clearance for the fill hose and should support a mostly vertical hose run to the tank. Straight deck fills should not be installed on a vertical surface within plus or minus 30 degrees, while angled deck fills may be installed on a vertical surface right side up with the hinge at the top within plus or minus 15 degrees.

Installation calls for a marine-grade urethane-based sealant rather than silicone-based sealant. The fill hose should be clamped with two corrosion-resistant metal clamps, and the vent hose connection uses 5/8 in hose in the matching Attwood vent-valve setup. The installer should use #8 pan head stainless steel fasteners that suit the deck material.

System compatibility

This deck fill is one component in a complete fuel and evaporative-emissions system. It should be used with the required carbon canister, inlet-control valve, vent valve and fuel-fill plumbing for the vessel. The overpressure relief valves in the cap are safety devices and are not a substitute for the carbon canister used for diurnal emission control.

It is a practical match for builders, refit yards and boat owners replacing or specifying a deck fill on modern fuel systems where vapor control, nozzle access and exposed deck conditions all matter.

Maintenance and care

Keep the cap and valve area clean during normal boat washing so dirt, wax or cleaning residue does not contaminate the fuel-fill hardware. Mild soapy water is the recommended cleaning approach, and all fuel-fill connections should be checked annually as part of routine fuel-system inspection.