Mercury Quicksilver Fuel Line Quick Connect Fitting 8M0146934 — 5/8 to 3/8 in. | V6 & V8 FourStroke
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Mercury Quicksilver Fuel Line Quick Connect Fitting — OEM 8M0146934 | 5/8 to 3/8 in.
This genuine OEM quick-connect fuel fitting is the exact-fit fuel-system connection for modern Mercury 3.4L V6 and 4.6L V8 FourStroke outboards. Part 8M0146934 connects 5/8-inch to 3/8-inch fuel hose and is built with materials designed for modern fuel systems, including ethanol-blended gasoline. If a quick-connect on your fuel system is leaking, cracked, or no longer locking securely, this is the OEM replacement.
Part Information
- OEM Part Number: 8M0146934
- Mercury Reference: 22-8M0146934
- Brand: Mercury / Quicksilver
- Official Product Type: Fuel-line quick-connect fitting
- Connection Size: 5/8 in. to 3/8 in. hose
- System: Fuel delivery / boat-mounted fuel filter assembly
- Ethanol Compatibility: Suitable for ethanol-blended gasoline
- GTIN / UPC: 745061241107
Compatible Applications
- Mercury 3.4L V6 FourStroke 175–225 HP — serial 2B529482 and up
- Mercury 4.6L V8 FourStroke 200–300 HP — serial 2B529482 and up
- Mercury 4.6L V8 Pro XS — boat-mounted fuel filter with water-in-fuel sensor assembly
- Mercury Verado — boat-mounted fuel filter with water-in-fuel sensor assembly (per OEM parts diagram)
- Mercury Racing 150R and 200R — 3.4L V6 outboard applications
- Confirm engine model, serial number, and fuel-hose connection size before ordering — Mercury uses a different quick-connect fitting for 1/2-inch hose applications
When to Replace
- Quick-connect mechanism is damaged, cracked, or will not lock securely
- Visible fuel leak at the fitting or sealing surfaces
- Sealing surfaces show deterioration, swelling, or cracking
- Fitting is being replaced as part of a fuel-system inspection or hose replacement
Installation Notes
- Depressurize or isolate the fuel system before beginning service
- Confirm hose sizes and fitting orientation before installation
- Inspect the mating connector and fuel hose for wear or damage
- Verify that the quick-connect locks fully and securely into position
- Check carefully for any fuel leakage before operating the engine
Technical FAQ
What hose sizes does 8M0146934 connect?
This fitting connects 5/8-inch to 3/8-inch fuel hose. Mercury uses a separate quick-connect fitting for 5/8-inch to 1/2-inch applications (8M0152434, later updated to 8M0215873) — confirm your hose size before ordering.
Is this fitting safe for ethanol-blended fuel?
Yes. 8M0146934 is built with materials compatible with modern fuel systems including ethanol-blended gasoline, as specified for use on Mercury V6 and V8 FourStroke outboards.
How do I confirm this is the right fitting for my engine?
Confirm the engine displacement (3.4L V6 or 4.6L V8), serial number (2B529482 and up), and the fuel-hose connection size (5/8 in. to 3/8 in.) against the application list above.
Parts Desk Insights
The most common ordering mistake with Mercury quick-connect fittings is not checking the hose size — Mercury uses multiple quick-connect configurations across the V6/V8 FourStroke family, and the 3/8-inch and 1/2-inch versions look almost identical. Always confirm the connection size and engine serial number. This fitting is most often needed when a customer reports a fuel smell in the bilge or near the engine on a V6 or V8 FourStroke — a deteriorating or unlocked quick-connect is one of the first places to check. Browse the Hoses & Fittings collection for related fuel-system components.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 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.