Mercury - Fuel Line Connector - 22-33821
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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Alternate/Superseded Part Numbers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. ⚓
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.