663-24410-00 692-24410-00 Mechanical Fuel Pump Assembly 15100-94311 356-04000-1, Compatible with select Yamaha 20C-90A Suzuki DT30 DT40W DT55 Tohatsu M25-M90 2-Stroke

663-24410-00 692-24410-00 Mechanical Fuel Pump Assembly 15100-94311 356-04000-1, Compatible with select Yamaha 20C-90A Suzuki DT30 DT40W DT55 Tohatsu M25-M90 2-Stroke

Which pump is this?

MECHANICAL LOW-PRESSURE DESIGN: This engine-mounted diaphragm pump uses crankcase pressure pulses to drive a diaphragm, springs and check valves that move fuel from the boat tank toward the carburetor. It is not an electric in-tank pump, not a high-pressure EFI pump, and not the carburetor-integrated pump used on some Mercury-built Mariner engines.

Signs yours is due

REPLACE THE COMPLETE PUMP: Intended as a complete-pump replacement for symptoms such as fuel in the crankcase oil, a rising or gasoline-smelling oil level, a wet fouled plug on one cylinder, stalling when throttle is applied, or losing prime after a few minutes at wide-open throttle, after the rest of the fuel path has been checked. The package contains one fuel-pump assembly and mounting gasket only.

Will it fit?

COMPATIBLE FITMENT: Compatible with select two-stroke outboards listed in official catalog records for this pump family, including select Yamaha 20C through 90A families, Suzuki DT30/DT40W/DT55/DT65, Tohatsu Nissan M25-M90 two-stroke models and Yamaha-built Mariner 20-60 twins. Same-name engines shipped different pumps across generations, so match the original pump number and engine model before ordering. Not for four-stroke engines, newer Suzuki DT9.9A/DT15A, or electric fuel systems.

Every row is from this SKU fitment workbook. Match the number stamped on the pump you remove. Same horsepower name shipped different pumps.

OEM and swap numbers

VERIFIED PART-NUMBER CHAIN: Replaces ref 663-24410-00, 6A0-24410-04, 6A0-24410-05, 692-24410-00, 15100-94301, 15100-94311, 356-04000-1 and 43113M. Catalog-supported aftermarket references include 18-7334, 40790, 2441, 1399-39553, 9-35305 and REC692-24410-00. 853729A1 is a Mercury number with official Where Used but no aftermarket-PDF hit, so it is not used as a front listing replaces-ref.

Wrong part

If the number on your old pump is not in the table above, this is the wrong pump.

What ships

One complete mechanical fuel-pump assembly and the gasket that belongs with this pump. No hose, no filter, no bolts, no carburetor, no rebuild kit.

Install

INSTALL WITH PART-NUMBER DISCIPLINE: Work in a ventilated area away from ignition sources, label the inlet and outlet hoses, compare the port orientation and gasket with the removed pump, use the engine manual's fastener torque, prime the line with the primer bulb and inspect for leaks. If the old pump number cannot be read, send the engine model, year and a photo of the original pump before purchase.

FAQ

Q: Will it fit my Suzuki DT9.9? A: New-generation DT9.9A/DT15A (P40 era) uses 15410-94400, a different pump. Older DT9.9C sail models reportedly used this family — verify the pump number on your engine.

Q: Will it fit my Mariner 40? A: Only Yamaha-built Mariner (serial prefixes like 6E9/6A9) uses this pump. Mercury-built 4-cylinder Mariners have a carburetor-integrated pump — different part.

Q: Is this electric or high-pressure? A: No. It is an engine-driven mechanical low-pressure diaphragm pump for carbureted two-stroke engines.

Q: Does it include a rebuild kit? A: No. This is the complete pump assembly; the diaphragm kit (15170-94320 / 18-7797) is a separate service part.

Please note

Aftermarket fuel pump by GHMarine. Not affiliated with the engine brands named above. Confirm the number on the removed pump, the engine model, and the serial range before you order. This page is the pump only, not a multi-part kit.