Mercury MerCruiser Quicksilver Fuel Pump Gasket 34213 | 27-34213
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Mercury MerCruiser Quicksilver Fuel Pump Gasket 34213 | 27-34213
Part Number: 34213 (service format: 27-34213)
Brand: Mercury / Quicksilver
Product Type: Mechanical Fuel Pump Mounting Gasket (OEM)
System: MerCruiser Fuel System
Application: Mechanical fuel pump mounting flange / fuel pump block-off plate
Quantity Required: 1 per assembly
GTIN: 745061137059
Approximate Weight: 10 g
Supersedes: 13046
What This Part Does
The 34213 is a genuine Mercury OEM gasket that seals the joint between the engine block and either the mechanical fuel pump or the fuel-pump block-off plate on selected MerCruiser gasoline engines. It prevents engine oil from leaking at the fuel-pump mounting flange — a common leak point when the original gasket has been disturbed, compressed, or left in service too long. Mercury parts diagrams use the same gasket beneath a block-off plate on engines where the mechanical fuel-pump opening is not occupied by an active pump.
Compatible Applications
Confirm your engine model, serial number, and fuel-system diagram before ordering. Mercury used several fuel-pump configurations across many years of MCM and MIE production.
- MerCruiser MCM and MIE gasoline engines with GM and Ford blocks — where 27-34213 is specified in the fuel-system diagram
- Selected GM 305 CID V8 MerCruiser sterndrive engines — used as the separate mounting gasket for mechanical fuel pump 8M0058164
- Selected GM 350 CID V8 MerCruiser sterndrive engines — same application
- MerCruiser engines using a fuel-pump block-off plate at the mechanical pump mounting location
Do not assume every GM- or Ford-based MerCruiser engine uses this gasket — confirm by the engine serial number and Mercury fuel-system parts diagram.
Serial Number Notice
Use 34213 only where the Mercury parts diagram specifies it as either the mechanical fuel-pump mounting gasket or the fuel-pump block-off-plate gasket. Mercury used different fuel-pump mounting configurations across MCM and MIE engine families — always confirm by engine serial number before ordering.
When to Replace
- Mechanical fuel pump is removed for service or replacement
- Fuel-pump block-off plate is removed
- Oil leakage is visible at the fuel-pump mounting flange
- Original gasket is torn, compressed, brittle, hardened, or damaged on inspection
- Mounting surface is being serviced or engine is undergoing a rebuild
Installation Notes
- Remove all old gasket material from both mating surfaces before installation — do not leave any residual gasket material that could create an uneven seating surface
- Keep debris out of the engine block opening during surface preparation
- Inspect the fuel pump flange or block-off plate for warping or distortion before reassembly
- Install dry or with sealant only if specified in the Mercury MerCruiser service instructions for the engine
- Tighten mounting fasteners evenly to the torque specification in the applicable Mercury service manual
- Run the engine and inspect the mounting flange area for oil leakage before returning to service
Part Number Cross-Reference
- Current OEM: 34213 / 27-34213
- Supersedes: 13046 → 34213
- Additional earlier references (same gasket family): 56883, FI5000074
- GTIN: 745061137059
Technical FAQ
Q: Is this a fuel-pump gasket or an engine gasket?
A: It is specifically a fuel pump mounting gasket — it seals the interface between the engine block and the mechanical fuel pump (or fuel-pump block-off plate). It is not a general engine gasket and should only be used where the Mercury parts diagram specifies 27-34213 at the fuel pump mounting location.
Q: My engine doesn’t have a mechanical fuel pump — do I still need this?
A: If the fuel-pump opening is covered by a block-off plate, Mercury diagrams specify the same 34213 gasket beneath the plate. If the plate is removed for any reason, replace the gasket before reinstalling.
Q: What replaced 13046?
A: Mercury superseded 13046 to 34213 / 27-34213. If your older parts manual shows 13046, order 34213 as the current equivalent.
Parts Desk Insights
Best use case: Order 34213 any time a MerCruiser mechanical fuel pump or fuel-pump block-off plate is coming off the engine. The gasket is a low-cost item and should always be replaced rather than reused — a disturbed gasket that is refitted without replacement is a reliable source of an oil leak at the next startup.
Common issues: The most common mistake is refitting the old gasket after removing the fuel pump, which results in an oil leak at the mounting flange. A second common issue is failing to clean the mating surfaces completely before installation — leftover gasket material causes the new gasket to seat unevenly and leak. Always confirm the gasket is specified at the correct position by checking the fuel-system diagram for the engine serial number before ordering.
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
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