Mercury & Mariner Outboard Water Pump Kits
This page features a comprehensive inventory of Mercury & Mariner outboard engine water pump kits and parts. You'll find choices from trusted brands—WSM, Sierra, EMP—covering a variety of horsepower and engine types (e.g., 20‑28 HP service kits, 40‑70 HP looper kits, 85‑300 HP cross‑flow kits) Whether you're rebuilding and angine or replacing the impeller, our selection includes complete kits and service components to keep your outboard running at peak cooling efficiency.
| HP | Serial Number | Water Pump Kit |
| Mariner | ||
| 9.9C | All | 750-407 |
| 20C (E) (EL), (M) (ML) | 250819 & Below | 18-3426 |
| 20C (E) (EL), (M) (ML) | 250820-Up | 18-3427 |
| 25C (E) (EL), (M) (ML) | 014870 & Below | 18-3426 |
| 25C (E) (EL), (M) (ML) | 014871-Up | 18-3427 |
| 30A (E) (EL), (M) (ML) | 014805 & Below | 18-3426 |
| 30A (E) (EL), (M) (ML) | 105325-Up | 18-3427 |
| Mercury | ||
| 4 HP | 5595532-9075838 | 18-3446 |
| 4.5 HP | 4107220-5595531 | 18-3446 |
| 4.5 HP | 5595532-Up | 18-3446 |
| 7.5 HP | 5206650-Up | 18-3446 |
| 8 HP | A197112-Up | 750-216 |
| 8 HP | G760300-Up | 750-216 |
| 110 (9.8) HP | 4126460-5206549 | 18-3446 |
| 9.8 HP | 5206550-Up | 18-3446 |
| 9.9 HP 4-Stroke | G760300-Up | 750-216 |
| XR10 SeaPro | D038000-Up | 750-216 |
| 15 HP | B292414-Up | 750-216 |
| 15 HP | G044365-Up | 750-216 |
| 18 HP | 5837437-6416712 | 750-225 |
| 20 HP | 2827677-6443972 | 18-3448 |
| 20XD / 25XD | 6443973-Up | 750-225 |
| 30 Jet | C159200-G589999 | 18-3324 |
| 30 Jet | G5755000-Up | 18-3324 |
| 30 HP | 3-Cylinder 4-Stroke | 750-156 |
| 35 HP | 6445653-Up | 18-3324 |
| 40 HP | 2874704-4362214 | 18-3322 |
| 40 HP | 4362215-4860102 | 18-3323 |
| 40 HP | 4862103-6445653 | 18-3324 |
| 40 HP | 4-Stroke | 750-156 |
| 40 HP | 0C159200-Up | 18-3324 |
| 40 HP | 0T228405-Up | 750-230 |
| 40 HP EFI 4-Stroke | 0T409000-Up | 750-230 |
| 45 HP | 5531630-Up | 18-3324 |
| 45 HP Jet 3-Cylinder | D000750-Up | 750-230 |
| 50 HP | 2514919-4357639 | 18-3322 |
| 50 HP | 4357640-4962055 | 18-3323 |
| 50 HP 4-Cylinder | 4962056-Up | 18-3324 |
| 50 HP | 6428681-0D000749 | 18-3324 |
| 50 HP | 0D000750-0G589999 | 750-230 |
| 50 HP | 4-Cylinder 4-Stroke | 750-156 |
| 50 HP | 0T178500-Up | 750-230 |
| 50 HP EFI 4-Stroke | 0T409000-Up | 750-230 |
| 55 HP 3-Cylinder | 0D000750-Up | 750-230 |
| 60 HP | 6428681-0D000749 | 18-3324 |
| 60 HP 3-Cylinder | 0D000750-Up | 750-230 |
| 60 HP 4-Stroke | 0T178500-Up | 750-230 |
| 60 HP | 4-Cylinder 4-Stroke | 750-156 |
| 65 HP | 3283184-4382056 | 18-3322 |
| 65 HP | 4352057-4571651 | 18-3324 |
| 70 HP | 4571652-4977156 | 18-3323 |
| 70 HP | 4977157-0B110053 | 18-3324 |
| 75 HP | 6432901 & Up | 750-157 |
| 75 HP | 3 Cylinder 1.5L DFI | 750-156 |
| 75 HP | EFI 4-Stroke | 750-156 |
| 80 HP | 4831999-6432900 | 750-157 |
| 85 HP | 4590512 & Up | 750-157 |
| 90 HP | 4845301 & Up | 750-157 |
| 90 HP | 3 Cylinder 1.5L DFI | 750-156 |
| 105 HP Jet | 0D182000 & Up | 18-3319 |
| 115 HP | 3 Cylinder 1.5L DFI | 750-156 |
| 135 HP | A904646 & Up | 750-157 |
| 140 HP | 4865678-5327662 | 750-157 |
| 140 HP Jet | 0D08200 & Up | 750-157 |
| 150 HP | 4121435-4868647 | 750-157 |
| 150 HP | A904645 & Below | 18-3316 |
| 150 HP | A904646 & Up | 18-3319 |
| 175 HP | 6618750 & Below | 18-3316 |
| 175 HP | 6618751 & Up | 18-3319 |
| 200 HP | 6625220 & Below | 18-3316 |
| 200 HP | 6625221 & Up | 18-3319 |
| 220 HP | 0B117316 & Up | 18-3319 |
| 225 HP | 5625028 & Up | 18-3316 |
| 2.4 EFI | ALL | 750-157 |
| XR-4 / Magnum II | B242885 & Up | 18-3319 |
| 250 HP | 1994-2007 | FM-302 |
