Fuel Pump Gasket – Fits Mercury/MerCruiser GM Engines (Replaces Mercury 27-34213)

$2.99 $4.00

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Product Details

This Fuel Pump Gasket – Fits Mercury/MerCruiser GM Engines provides a reliable seal for mounting mechanical fuel pumps on a wide variety of MerCruiser GM engines, including 4-cylinder, inline 6-cylinder, V-6, and V-8 models manufactured from 1963 through the early 2000s.

It serves as a direct replacement for Mercury/MerCruiser 27-34213, GLM 31360, and Sierra 18-1889, ensuring compatibility and performance.

Installation Location: Mounts between the fuel pump and the engine block for a precise fit.
Fuel Compatibility: Engineered for use with standard gasoline fuel systems.
Durable Material: Made from a high-quality paper/composite blend to ensure a long-lasting, leak-free seal.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.

Brand	Part Number
Mercury/MerCruiser	27-34213
GLM	31360
Sierra	18-1889

Engine & Model Compatibility

Confirm your engine model and year in the table below to ensure accurate fitment.

This gasket is primarily designed for the MerCruiser inboard and sterndrive engines listed. While it may also fit some Mercury outboard fuel pumps, application should be verified by part number.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
MerCruiser	110 GM 153 I/L4	110	4-Stroke	1963–1966	27-34213	Serial #1537370-2044033
MerCruiser	120 GM 153 I/L4	120	4-Stroke	1964–1986	27-34213	Serial #1666601-0B531853
MerCruiser	140 GM 181 I/L4	140	4-Stroke	1968–1986	27-34213	Serial #2508261-0B450800
MerCruiser	2.5L GM 153 I/L4	120	4-Stroke	1987–1989	27-34213	Serial #0B531854-0C856558
MerCruiser	3.0L GM 181 I/L4	140	4-Stroke	1987–1989	27-34213	Serial #0B450801-0C856558
MerCruiser	140 GM 194 I/L6	140	4-Stroke	1963	27-34213	Serial #1538930-1725960
MerCruiser	150 GM 230 I/L6	150	4-Stroke	1964–1966	27-34213	Serial #1666495-2048046
MerCruiser	160/165 GM 250 I/L6	160-165	4-Stroke	1967–1981	27-34213	Serial #2048022-5178959 and up
MerCruiser	200 GM 292 I/L6	200	4-Stroke	1969	27-34213	Serial #2453769-2712072
MerCruiser	4.3L V-6	175-205	4-Stroke	1987–1992	27-34213
MerCruiser	5.0L/5.7L V-8	190-350	4-Stroke	1969–1997	27-34213	Multiple models including Alpha/Bravo
MerCruiser	7.4L/8.2L V-8	330-502	4-Stroke	1977–1997	27-34213	Multiple models including Bravo/Magnum
MerCruiser	280/300 TRS/Tempest GM 350 V-8	280-300	4-Stroke	1975–1986	27-34213	Serial #4176250-0B430367
MerCruiser	370/400/440 TRS GM 454 V-8	370-440	4-Stroke	1978–1987	27-34213	Serial #4179554-0B714586
MerCruiser	420/425/450 GM 454 V-8	420-450	4-Stroke	1987–1996	27-34213	Multiple generations V-8
MerCruiser	460 TRS GM 482 V-8	460	4-Stroke	1983–1986	27-34213	Serial #4179554-6181046
MerCruiser	465/500 GM 502 V-8	465-500	4-Stroke	1990–1999	27-34213	Multiple generations V-8
MerCruiser	525-900 Racing Engines	525-900	4-Stroke	1991–2001	27-34213	Various high-performance models

Technical Specs

Product Type: Fuel Pump Mounting Gasket
Installation: Between fuel pump and engine block
Material: Paper/Composite
Dimensions: 4.0" × 5.13" × 1.06" (Package)
Weight: Negligible
Package Quantity: 1
GTIN: 745061137059

What’s in the Box

1 x Fuel Pump Gasket (27-34213)

Installation Notes

Disconnect the battery and ensure the engine is completely cool before starting.
Relieve fuel system pressure according to your engine's service manual.
Place absorbent rags under the fuel pump and carefully disconnect the fuel lines.
Unbolt and remove the old fuel pump from the engine block.
Thoroughly clean both mating surfaces, ensuring all old gasket material and sealant are removed.
Position the new gasket onto the engine block or fuel pump.
Reinstall the fuel pump, tightening the bolts evenly to the manufacturer's specified torque.
Reconnect the fuel lines, then reconnect the battery.
Start the engine and carefully inspect for any fuel leaks around the pump and fittings.

Troubleshooting & FAQ

How do I know if this gasket fits my engine?

The best way is to match the part number (27-34213, GLM 31360, Sierra 18-1889) to your service manual's requirements. You can also use our detailed compatibility table to verify your MerCruiser model and serial number range.

What are the signs of a failing fuel pump gasket?

Common symptoms include a visible fuel leak at the base of the pump, a strong gasoline odor in the engine bay, poor or rough engine performance, hesitation, or difficulty starting due to a loss of fuel pressure.

Can I reuse my old gasket or do I need sealant?

Never reuse a fuel pump gasket, as it is a single-use crush-style seal. This gasket is designed to be installed dry. However, always consult your engine's service manual for any specific instructions or sealant recommendations.

What is the difference between this and an OEM gasket?

This is an aftermarket part built to meet or exceed OEM specifications using comparable materials. It offers the same reliable, leak-free performance at a better value.

How often should I replace this gasket?

The gasket should be replaced every time the fuel pump is removed or serviced. It does not have a separate service interval but is critical to replace during any fuel system maintenance to prevent leaks.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement part, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

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