Mercury MerCruiser Quicksilver Fuel Pump Assembly 8M0073435
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Mercury MerCruiser Mechanical Fuel Pump Assembly
Part Number: 8M0073435 | GTIN: 745061450523
Brand: Mercury / MerCruiser / Quicksilver | Type: Mechanical Fuel Pump Assembly
Configuration: Bowl-down (fuel-filter bowl mounted beneath pump body)
Genuine Mercury MerCruiser OEM mechanical fuel pump assembly for selected 2.5L, 3.0L, and 3.7L four-cylinder MerCruiser sterndrive engines. Includes fuel filter and mounting gasket. Supersedes earlier part numbers 42725A3, 42725A4, and 861676A1.
Compatible Applications
- MerCruiser 120 HP / 2.5L GM 153 I/L4 sterndrive
- MerCruiser 140 HP / 3.0L GM 181 I/L4 sterndrive
- MerCruiser 165 HP / 3.7L Mercury 224 I/L4 sterndrive
- MerCruiser 170 HP / 3.7L Mercury 224 I/L4 sterndrive
- MerCruiser 180 HP / 3.7L Mercury 224 I/L4 sterndrive
- MerCruiser 190 HP / 3.7L Mercury 224 I/L4 sterndrive
- Additional 2.5L and 3.0L sterndrive applications using the bowl-down mechanical fuel-pump arrangement
Confirm engine model, serial number, and existing fuel-pump orientation (bowl-down) before ordering. Replacing an older pump with 8M0073435 may require fuel-line modification or rerouting if inlet and outlet locations differ from the earlier design.
What’s Included
- Mechanical fuel pump assembly (bowl-down configuration)
- Fuel filter
- Mounting gasket
When to Replace the Fuel Pump
Replace when diagnosis confirms inadequate fuel delivery, internal diaphragm failure, fuel leakage at the pump body or fittings, or visible physical damage. Before replacing the pump, check for restrictions elsewhere in the fuel system — fuel-line condition, tank pickup, and primer bulb (if applicable) should all be inspected first.
Installation Notes
Disconnect battery power and isolate the fuel supply before service. Inspect all fuel lines, fittings, and the mounting surface before installation. Use the supplied gasket and verify all fuel connections are secure and completely leak-free before running the engine. If replacing an earlier pump, compare inlet and outlet port locations to determine whether fuel-line modifications are required.
Alternate & Superseded Part Numbers
- Current OEM: 8M0073435
- Supersedes: 42725A3
- Supersedes: 42725A4
- Supersedes: 861676A1
- Sierra cross-reference: 18-7282 / 18-35437
- GTIN: 745061450523
Parts Desk Insights
The key fitment detail for 8M0073435 is the bowl-down mechanical fuel-pump configuration. When a customer is replacing an older pump, the inlet and outlet port locations on the later design can differ from the earlier versions, which may require fuel-line changes during installation. Always confirm the bowl orientation and port layout match the original before finalizing the order. A common customer mistake is ordering based on engine displacement alone without verifying the pump configuration — some 3.0L applications used different pump orientations depending on engine vintage and installation.
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.
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