Weekend coming up? Order this Mercury FUEL PUMP DIAPHRAGM KIT (Contents Of (27-43004A86) Gasket Set) Component Of Gasket Set [27- 43004A86] now for fast shipping. Most orders placed by 1pm ship today so you’re fishing, not fixing.

Manufactured to strict Mercury Marine quality standards, this pump ensures reliable operation across all engine RPM ranges. Part number 42909A4 is manufactured to exact Mercury Marine factory specifications for precision installation and optimal performance. Constructed from premium marine-grade materials designed to withstand harsh saltwater and freshwater environments.

Aftermarket parts might save a few dollars upfront, but genuine Mercury Marine part 42909A4 saves you money long-term by lasting years instead of months. Factory precision means perfect fit — no modifications, no surprises.

Compatible Mercury Marine Engines

FITS: 75-90HP MARINER, MERCURY

• Fits MARINER, MERCURY 75-90HP engines
• Compatible HP: 75HP, 90HP
• Covers 8 serial number ranges
• Configurations: Outboard
• OEM genuine Mercury Marine part

COMPLETE SERIAL NUMBER COMPATIBILITY:

75HP Models

• 75HP OUTBOARD (Mariner): 0C222000-0D283221, 9589039-9793576
• 75HP OUTBOARD (Mercury): 0C222000-0D283221, 9589039-9793576

90HP Models

• 90HP OUTBOARD (Mariner): 0C222000-0D283221, 9589039-9793576
• 90HP OUTBOARD (Mercury): 0C222000-0D283221, 9589039-9793576

Don’t know where your serial number is? Our quick reference guide shows exactly where to find it on Mercury Marine engines.

Verification & Support

Verify part 42909A4 works with your Mercury using our parts finder tool. Have questions? Reach out using the contact buttons at the bottom of this page — our team is here to help by text, call, or email

Serving boaters for over 40 years. Competitive pricing, same-day shipping on most orders.