Total Price:
Add to Cart12-piece diaphragm repair kit designed for select 30–65hp Mercury and Mariner 2-stroke outboards. Ideal for restoring carburetor function and fuel delivery efficiency.
Fits:
Replaces:
What is the Mercury-MerCruiser 21-857005A-1 Outboard Fuel Pump Diaphragm Kit used for?
The Mercury-MerCruiser 21-857005A-1 Outboard Fuel Pump Diaphragm Kit is a 12-piece diaphragm repair kit for select Mercury and Mariner 2-stroke outboards. It is designed for applications where repairing the fuel pump diaphragm can help restore carburetor function and fuel delivery efficiency.
Which Mercury and Mariner outboards fit the 21-857005A-1 Fuel Pump Diaphragm Kit?
The listed applications range from 30 JET through V-250/275, including select 35, 40, 45, 50, 55, 60, 65, 75, 80, 90, 100, 105, 115, 125, 135, 140, 150, 175, 200, and 225 HP applications. Specific serial-number ranges apply to many applications, so verify your engine details before ordering.
Is the Mercury-MerCruiser 21-857005A-1 a complete fuel pump repair kit?
The product description identifies the 21-857005A-1 as a 12-piece diaphragm repair kit. It is intended for select outboard fuel pump applications and is described as suitable for repairing the diaphragm. The description does not provide a detailed list of each of the 12 included pieces.
What engine applications have specific serial-number requirements for this diaphragm kit?
Many listed applications have specific serial-number ranges. Examples include 35 HP B110789 and up, 40 HP 4 Cylinder C159200 and up, 50 HP 3 Cylinder B122930 and up, 90 HP 6 Cylinder 6436123-B1100053, and V-250/275 C101891 and up. Check the complete application list and your engine serial number before ordering.
What part numbers does the Mercury-MerCruiser 21-857005A-1 Fuel Pump Diaphragm Kit replace?
The 21-857005A-1 Fuel Pump Diaphragm Kit is listed as replacing GLM 40290, Pro Marine 1812, Redline RL7817, Sierra 18-7817, and Sierra 18-7818-1. Comparing your existing part number with the listed replacement numbers can help verify the correct kit for your application.
What should I verify before ordering the 21-857005A-1 diaphragm repair kit?
Verify your outboard's horsepower, cylinder configuration where specified, engine type, and serial number against the listed applications. The product description covers numerous Mercury and Mariner applications with different serial-number ranges, so matching these details to your specific engine is important before ordering.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Quicksilver 8M6010292 Fuel Pump Kit - Fits Select Yamaha 75-115hp EFI OutboardsQuicksilver fuel pump kit 8M6010292 is for use on select 75-115hp Yamaha EFI outboards. This Quicksilver fuel pump is...
Quicksilver 8M6013859 EFI Fuel Pump Assembly - Fits Select Yamaha 115hp Outboards Quicksilver EFI fuel pump assembly 8M6013859 is for use on select 115hp Yamaha outboards. See your owner's or service...
Mercury - Mercruiser 892267A51 Fuel Pump Kit Genuine OEM Mercury-Mercruiser part. Special Order Item Special Order Quicksilver Information: Additional Handling Time: Item transfers from an...
Mercruiser 866170A01 Fuel Pump Kit Genuine OEM Mercury - Mercruiser part. Fits GM V‑8 (305, 350, 377 496 & 502 cid) engines w/ Gen III Cool Fuel module Low pressure lift pump Replacement: Sierra...
Quicksilver 855427A1 Pump Kit-Fuel Quicksilver High Pressure Fuel Pump 855427A1 is a genuine OEM replacement engineered to maintain precise fuel delivery in Mercury and Mariner high-performance...
