YRANZO Mechanical Fuel Pump for Mercruiser & Volvo Penta 2.5L–3.7L Engines — Direct Replacement for OEM Parts

YRANZO mechanical fuel pump designed to directly replace OEM part numbers for Mercruiser and Volvo Penta 2.5L–3.7L engines, restoring reliable fuel delivery for 1984–2001 models.

This heavy-duty mechanical fuel pump from YRANZO is engineered as a compatible replacement for several factory part numbers, including 42725A3, 861676A1, 8M0073435, 509407, 3854858 and others. It fits a range of Mercruiser and Volvo Penta inboard engines — covering 2.5L, 3.0L and 3.7L variants used between the mid-1980s and early 2000s. The pump provides a straightforward swap for worn or leaking originals, letting you return your boat to dependable fuel delivery without modifying the engine or fuel lines.

Which engines and years will this pump work with?

This YRANZO pump matches the mechanical specifications for many Mercruiser and Volvo Penta models. It supports 2.5L and 3.0L Mercruiser engines, and 3.7L variants where listed, across model years commonly produced from 1984 through 1993 and certain Volvo Penta 3.0L units from 1995–2001.

• Mercruiser: 165 / 170 / 180 / 181 / 190 / 225 and specified 470-1 / 488 blocks
• Volvo Penta: selected 3.0L 181-series 1995–2001 models
• Cross-references common OEM numbers for correct fit

How does this pump replace OEM parts and which numbers are covered?

YRANZO designed this unit to be a drop-in replacement for many factory fuel pump part numbers, matching mounting pattern, inlet/outlet positions and diaphragm operation. The listing includes multiple cross-reference numbers so you can confirm compatibility before purchase.

• Common OEM cross-references: 42725A3, 861676A1, 8M0073435
• Additional numbers: 509407, 3854858, 18-7282, 9-35422 and variants
• Check your current pump’s stamped or printed part number to ensure a match

What should I expect during installation and performance?

Installation is intended to be straightforward for mechanically skilled DIYers or professional technicians familiar with inboard engine fuel systems. The pump uses the same mounting and pushrod drive interface as the original, so fuel line and gasket changes are typically the only additional steps.

• Direct-fit mounting pattern minimizes modification
• Use new gaskets and clamps to prevent leaks
• Prime and check for leaks before starting the engine

Are there any purchase or aftercare tips I should know?

Before ordering, compare the pump’s listed cross-reference numbers with the part number on your existing pump to avoid incorrect fitment. YRANZO provides customer support for fitment questions and will assist if the product doesn't meet expectations.

• Verify compatibility with engine model and year
• Inspect mounting and fuel line condition during replacement
• Contact seller promptly for any issues or returns

Who is this for: This YRANZO mechanical fuel pump is intended for boat owners, marine technicians and restoration projects needing a reliable replacement for worn or leaking OEM pumps on Mercruiser and Volvo Penta 2.5L–3.7L engines. It suits anyone wanting a direct-fit aftermarket option that cross-references multiple factory part numbers for straightforward installation and dependable fuel delivery.