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18-7837
3C8040050
3C8040050M
350040050
350040050M
6L2-24435-00-00
677-24411-01-00
677-24411-02-00
677-24434-01-00
677-24434-02-00
677-24471-01-00
815009
815009M
84261M
84262M
84265M
Sierra Fuel Pump Kit 18-7811
The Sierra 18-7811 Fuel Pump Kit is a rebuild kit designed for Mercury and Mariner inline 6-cylinder 2-stroke outboards. This kit restores proper fuel delivery by replacing worn diaphragms and internal components in mechanical fuel pumps.
Fitment Overview
This Sierra kit replaces Mercury OEM part numbers 66599A1 and 89031A1, along with GLM 40350 and Mallory 9-37756. These part numbers identify a fuel pump family used on Mercury inline-6 engines.
Compatibility
| Brand | Horsepower | Engine Type |
|---|---|---|
| Mercury | 90 HP | Inline 6-Cylinder 2-Stroke |
| Mercury | 115 HP | Inline 6-Cylinder 2-Stroke |
| Mercury | 140 HP | Inline 6-Cylinder 2-Stroke |
| Mariner | 90 HP | Inline 6-Cylinder 2-Stroke |
| Mariner | 115 HP | Inline 6-Cylinder 2-Stroke |
| Mariner | 140 HP | Inline 6-Cylinder 2-Stroke |
These engines use a mechanical diaphragm-style fuel pump associated with the 66599A1 / 89031A1 fuel pump assembly.
Example Model Applications
- Mercury 90HP inline-6 2-stroke models
- Mercury 115HP inline-6 2-stroke models
- Mercury 140HP inline-6 2-stroke models
- Mariner equivalent inline-6 models
These are typical applications. Always verify by matching your OEM part number.
Fits These Serial Ranges
This fuel pump kit is used across multiple Mercury inline-6 engine generations and does not follow a single serial-number break.
Important: Confirm compatibility by matching your existing fuel pump or OEM number to 66599A1, 89031A1, 18-7811, 40350, or 9-37756.
Need the alternate fuel pump kit for a different pump style?
View Pro Marine Fuel Pump Kit 115 (A3 Style)
Part Numbers and Cross References
| Type | Part Number |
|---|---|
| Sierra | 18-7811 |
| Mercury OEM | 66599A1 |
| Mercury OEM | 89031A1 |
| GLM | 40350 |
| Mallory | 9-37756 |
What This Part Is Used For
This kit rebuilds diaphragm-style fuel pumps by replacing worn internal components such as gaskets, valves, and diaphragms. It restores proper fuel flow and pressure to the engine.
- Rebuilds mechanical fuel pump assemblies
- Restores fuel pressure and delivery
- Helps eliminate fuel starvation issues
- Supports reliable engine performance
A failing fuel pump can cause hesitation, stalling, hard starting, or poor acceleration.
System Function and Connections
- System Type: Mechanical fuel delivery
- Pump Type: Diaphragm fuel pump
- Location: Engine-mounted fuel pump assembly
FAQ
What engines does this kit fit?
It fits Mercury and Mariner inline 6-cylinder 2-stroke outboards in the 90HP, 115HP, and 140HP range using the A1-style fuel pump.
What is the difference between this and the A3 kit?
This kit fits the A1-style fuel pump (66599A1 / 89031A1). Some engines use a different pump design that requires the A3 kit.
How do I confirm fitment?
Match your fuel pump number or OEM part number to the cross references listed above.
What are signs of a bad fuel pump?
Hard starting, fuel starvation, hesitation, or engine stalling.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 (continental U.S.).
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1–5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Items must be new, unused, and in original packaging.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Part Numbers
18-7811, 66599A1, 89031A1, 40350, 9-37756, Sierra fuel pump kit, Mercury inline 6 fuel pump kit, Mercury 115 fuel pump rebuild kit
18-7811
40370
508429
66599A1
89031A1
9-37752
0438616
0777760
18-7800
18-7800
40850
433519
438616
777760
878961
9-37701
42990A10
42990A11
42990A2
42990A3
42990A4
42990A5
42990A6
42990A7
42990A8
42990A9
857005A1
Mercury Fuel Module Seal
Mercury 75-115 EFI / Verado 135-300 Fuel Pump Seal 880596510
This OEM Mercury seal is used in Mercury fuel supply module applications that use lift pump kit 880596T58. It is the companion seal for Pro Marine lift pump applications 80596-58P and 80596-58.
Seal 880596510 is commonly serviced with the related Mercury isolator 880596509. Always verify your engine model, serial number, and OEM parts diagram before ordering fuel module components.
Compatible Applications
| Engine Family | Application | Fitment Note |
|---|---|---|
| Mercury / Mariner 75-115 EFI 4-stroke | Fuel supply module lift pump seal | Used with 880596T58 lift pump applications. Verify serial number before ordering. |
| Mercury / Mariner Verado 135-300 4-stroke | 4-cylinder and 6-cylinder fuel module service | Related to 880596T58 lift pump service. Confirm model, serial range, and parts diagram. |
| Mercury Verado 200 / 225 / 250 6-cylinder | Fuel supply module seal reference | Verified fitment appears in 6-cylinder Verado fuel supply module listings; confirm exact serial range. |
Important Fitment Note
OEM number 880596510 is a Mercury fuel supply module seal used with the lift pump area, not the complete pump assembly. For best results, match this seal by OEM number, fuel pump number 880596T58, and your Mercury serial-number-specific parts diagram.
OEM & Cross Reference Numbers
| Mercury OEM Number | 880596510 |
|---|---|
| Mercury Prefixed Number | 26-880596510 |
| Part Description | Seal for 80596-58 / fuel supply module lift pump service |
| Related Mercury Isolator | 880596509 |
| Related Lift Pump Kit | 880596T58 |
| Pro Marine Pump Numbers | 80596-58P, 80596-58 |
What This Part is Used For
Seal 880596510 is used in the Mercury fuel supply module at the lift pump service area. When replacing a lift pump or servicing the fuel module, this seal helps support proper sealing around the pump assembly. Inspect the related isolator and surrounding fuel module seals during service.
Related Fuel Pump Parts
Mercury Fuel Pump Isolator
OEM Mercury isolator 880596509 used with this seal in the fuel module lift pump area.
View Isolator 880596509
Pro Marine Fuel Pump Lift
Aftermarket lift pump for Mercury 75-115 4-stroke and Verado 135-300 applications using 880596T58.
View Pump 80596-58P
Pro Marine Fuel Pump Kit with Seals
Pro Marine lift pump kit option for Mercury 75-115 4-stroke and Verado 135-300 4 and 6 cylinder applications.
View Pump Kit 80596-58Key Features and Benefits
- OEM Mercury Marine seal for fuel supply module lift pump service.
- Used with lift pump applications referencing Mercury 880596T58.
- Companion part to Mercury isolator 880596509.
- Supports proper sealing when replacing or servicing the lift pump area.
- Best verified by OEM number, engine serial number, and Mercury parts diagram.
Service Kit Details
| Item Number | 880596510 |
|---|---|
| Manufacturer Item | 880596510 |
| Manufacturer | Mercury Marine |
| Product Type | Fuel module seal |
| Related Fuel Pump Type | Electric fuel module lift pump application |
FAQ
Is 880596510 the lift pump?
No. 880596510 is the seal used with the fuel module lift pump area. The related Mercury lift pump kit number is 880596T58.
Does this seal go with isolator 880596509?
Yes. Seal 880596510 and isolator 880596509 are related fuel module service parts used around the lift pump assembly.
Will this fit every Mercury 75-115 EFI or Verado 135-300?
Not automatically. Fuel module parts vary by model and serial range, so confirm the OEM part number and your engine serial before ordering.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
Mercury fuel pump seal, Mercury fuel supply module seal, Mercury Verado fuel pump seal, Mercury 75 90 115 EFI fuel module seal, Mercury lift pump seal.
Searchable Part Numbers
880596510, 26-880596510, 880596509, 880596T58, 80596-58P, 80596-58
Mercury Fuel Pump Isolator
Mercury 75-115 EFI / Verado 135-300 Fuel Pump Isolator 880596509
This OEM Mercury isolator is used in Mercury fuel module lift pump applications that use OEM fuel pump kit number 880596T58. It is commonly purchased with the matching Mercury seal 880596510 when servicing the lift pump area of the fuel module.
Fitment should be verified by engine model, serial number, and OEM part number before ordering. Pro Marine also offers related lift pump options for this application, including pump-only and pump-with-seals configurations.
Compatible Applications
| Engine Family | Application | Fitment Note |
|---|---|---|
| Mercury / Mariner 75-115 EFI 4-stroke | Fuel module lift pump service | Used with fuel pump kit 880596T58. Verify serial number and parts diagram. |
| Mercury / Mariner Verado 135-300 4-stroke | 4-cylinder and 6-cylinder lift pump applications | Used with related 880596T58 lift pump applications. Confirm exact model and serial. |
Important Fitment Note
OEM number 880596509 is an isolator used in the fuel module assembly with lift pump kit 880596T58. Because Mercury fuel module parts can vary by serial range, confirm your engine serial number and compare your parts diagram before ordering.
OEM & Cross Reference Numbers
| Mercury OEM Number | 880596509 |
|---|---|
| Part Description | Isolator |
| Related Mercury Seal | 880596510 |
| Related Lift Pump Kit | 880596T58 |
| Pro Marine Pump Numbers | 80596-58P, 80596-58 |
What This Part is Used For
The 880596509 isolator helps position and isolate the lift pump in the Mercury fuel module assembly. When replacing or servicing the lift pump, inspect the related seal and surrounding fuel module components so the pump is supported and sealed correctly.
Related Fuel Pump Parts
Seal for 80596-58
OEM Mercury seal 880596510 used with this lift pump service area.
View Seal 880596510
Pro Marine Fuel Pump Lift
Aftermarket lift pump for Mercury 75-115 4-stroke and Verado 135-300 applications using 880596T58.
View Pump 80596-58P
Pro Marine Fuel Pump Kit with Seals
Pro Marine lift pump kit option for Mercury 75-115 4-stroke and Verado 135-300 4 and 6 cylinder applications.
View Pump Kit 80596-58Key Features and Benefits
- OEM Mercury Marine isolator for fuel module lift pump service.
- Used with related Mercury lift pump kit number 880596T58.
- Pairs with Mercury seal 880596510 when servicing the same pump area.
- Helps support proper lift pump positioning inside the fuel module assembly.
- Best matched by OEM number, engine serial number, and parts diagram.
Service Kit Details
| Item Number | 880596509 |
|---|---|
| Manufacturer Item | 880596509 |
| Manufacturer | Mercury Marine |
| Product Type | Fuel pump isolator |
| Fuel Pump Type | Electric fuel module lift pump application |
FAQ
Is 880596509 the lift pump?
No. 880596509 is the isolator used with the lift pump area. The related lift pump kit number is 880596T58.
Does this go with seal 880596510?
Yes. Seal 880596510 is a related Mercury fuel module seal commonly serviced with this pump area.
Will this fit every Mercury 75-115 or Verado 135-300?
Not automatically. Mercury fuel module parts can vary by model and serial number, so verify your serial number and OEM parts diagram before ordering.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
Mercury fuel pump isolator, Mercury Verado lift pump isolator, Mercury 75 90 115 EFI fuel module isolator, Mercury fuel supply module isolator, Mercury lift pump seal parts.
Searchable Part Numbers
880596509, 880596510, 880596T58, 80596-58P, 80596-58
40290
42990A1
42990A10
42990A11
42990A2
42990A3
42990A4
42990A5
42990A6
42990A7
42990A8
42990A9
857005A1