Description

The Mercury Quicksilver Fuel Line Connector 22-33821 is an OEM brass fuel-system adapter fitting used on select Mercury and MerCruiser fuel delivery applications. It connects internal fuel lines to compatible fuel filter or water-separating fuel bracket assemblies, helping maintain a sealed fuel connection and prevent leaks or air intrusion.

Key Features

• Genuine Mercury/Quicksilver fuel line connector fitting
• Part number: 22-33821
• Also referenced as 33821
• 1/4″ NPT male x 3/8″ inverted flare configuration
• Brass fuel-system fitting
• Approximate size: 1.0″ L x 1.0″ W x 1.0″ H
• Approximate weight: 0.06 lb
• GTIN / UPC: 745061136892

Engine Compatibility

Used on select Mercury and MerCruiser fuel-system applications, including compatible water-separating fuel filter bracket assemblies and specialized MerCruiser performance engine configurations such as Scorpion 377 / 6.2L V8 inboard applications where this fitting is shown in the parts diagram.

Serial Number Fitment Notice

Verify fitment by engine serial number, fuel filter bracket diagram, thread type, and original fitting part number before ordering. Fuel fittings can vary by bracket style, fuel-line flare type, port size, and production range.

When This Part Needs Replacement

Replace this fitting if it is leaking, cracked, cross-threaded, rounded, corroded, stripped, or damaged during fuel filter bracket or fuel line service.

Installation Notes

Confirm the NPT and inverted flare connection points before installation. Use fuel-rated thread sealant only where approved, and do not apply sealant to flare sealing surfaces. After installation, inspect carefully for leaks before operating the engine.

Alternate/Superseded Part Numbers

Primary Mercury references: 22-33821 and 33821.

Parts Desk Insight

Fuel fittings need to match both thread type and sealing style. An NPT-to-flare fitting may look close to other brass adapters, but the wrong flare or pipe-thread size can create leaks or air draw into the fuel system.

Shipping: Ships same or next day for fast Canada wide shipping.