Heurofosh Engine-End Fuel Connector 13563Q3 for Mercury 4-40 HP Outboards — Metal & ABS Quick-Disconnect

Heurofosh 13563Q3 is a metal-and-ABS engine-end fuel connector designed to replace the clip-on fuel fitting on many Mercury and compatible outboard engines from 4 to 40 horsepower.

This replacement fuel connector is made for the engine end where the fuel line attaches to the outboard, using a clip-on quick-disconnect style favored by Mercury and similar manufacturers. It’s built from a combination of durable metal and ABS plastic to withstand marine conditions and repeated connect/disconnect cycles. The part cross-references multiple OEM numbers so you can match it to older or alternative supply codes before installing.

Which engines will this connector work with?

The Heurofosh 13563Q3 fits a wide range of outboards from small portable two-strokes to larger multi-cylinder four-stroke units. It’s listed as compatible with Mercury, Mariner, Force and other makes across various horsepower ranges, but compatibility depends on the specific year and engine sub-model.

• Works with small 2-stroke engines: 4 hp and 5 hp.
• Compatible with mid-range models: 9.9 hp, 15 hp, 25 hp, 30 hp, 40 hp.
• Also cross-references higher-power units: 50–150 hp listings for certain models.
• Check existing OEM numbers like 22-13563Q3, 13563A1/A3, 16609M, Sierra 18-8076, Mallory 9-38004 to confirm fit.

How durable and weather-resistant is this fuel connector?

This connector combines metal structural components with molded ABS plastic where flexibility and sealing are needed. The materials were chosen to resist corrosion, vibration, and typical exposure to fuel and salt air, giving a reliable service life when installed properly.

• Metal core for secure mechanical connection and longevity.
• ABS plastic body areas for impact resistance and sealing.
• Designed for frequent clip-on/click-off use without rapid wear.
• Suitable for marine environments with routine maintenance.

How do I confirm this is the correct replacement for my boat?

Before ordering, compare the part numbers printed on your old connector or consult the engine’s parts diagram. Visual inspection of the disconnect style and hose connection diameter also helps avoid mismatches; if in doubt, cross-reference the listed replacement numbers.

• Compare OEM numbers (e.g., 22-13563Q3, 13563A3, 13563A1) shown on the original part.
• Verify clip-on disconnect style matches your engine’s fuel coupler.
• Measure hose ID/OD where the connector mounts for correct fitment.
• If unsure, consult engine manual or dealer with engine serial number.

What should I expect during installation and maintenance?

Installation typically involves disconnecting the old connector at the engine end and attaching the new fitting to the fuel hose and fuel inlet, ensuring a secure clip and leak-free seal. Regular inspection for cracks, wear, or fuel seepage keeps the system safe and dependable.

• Install using proper fuel-line clamps and correct hose sizing.
• Ensure clip fully seats and locks to the engine inlet.
• Check for leaks at initial start-up and after several runs.
• Replace if plastic shows stress or metal parts corrode.

Who this part is for: Boat owners, marine technicians, and DIYers who need a reliable engine-end fuel quick-disconnect for Mercury and compatible outboards. It’s aimed at people replacing worn or mismatched connectors on portable two-strokes, mid-range outboards, and certain larger engines that share the clip-on fuel coupling style. Always confirm compatibility with your engine model and OEM part numbers before purchase to ensure a correct, safe fit.