Product Description
Genuine 40250 Fuel Pump (Vintage Rebuilt)
Restore the fuel delivery system of your classic Buick with this genuine 40250 mechanical fuel pump. This is a vintage rebuilt part, manufactured in the USA. It has been professionally remanufactured using a high-quality original core to ensure period-correct appearance and reliable performance for your "Nailhead" V8 engine.
This part is designed for the engine-mounted position on 1966-1967 Buick models, including the Special, Wildcat, and Riviera, equipped with the 401 CID or 425 CID V8 engines. This mechanical pump is specifically engineered for vehicles equipped with air conditioning (A/C) and is a direct replacement for original equipment part number GM 6440250.
Note on Stock Photos: Due to our volume of identical, interchangeable inventory, we use representative stock photos for this model. The image is for reference only and may depict a specific manufacturer (e.g., 'AC'). You will receive a pump that meets all listed specifications, which may be from the manufacturer shown or a fully equivalent alternative.
A Note on Fitment Accuracy: We manually research and cross-reference our fitment data using vintage manufacturer catalogs. While we strive for 100% accuracy, these decades-old resources—and the humans reading them—can occasionally contain errors. Additionally, these pumps may fit other vehicles and years not explicitly listed in our data. To ensure a seamless restoration, we kindly ask that you perform your own due diligence and verify that this specific part number is correct for your application prior to purchase.
Key Features:
- Part Number: 40250 (Master 40250M)
- Interchange / Replaces OEM: GM 6440250, Carter M4505
- Position: Engine Mounted
- Engine Fitment: Buick V8 (401 & 425 CID Nailhead)
- Origin: Made in USA (Vintage Stock)
- Condition: Vintage Rebuilt
Verified Vehicle Fitment:
| Make | Model | Year | Engine | Notes |
| Buick | Riviera / Wildcat / Electra 225 | 1966 | 401, 425 V8 | With Air Conditioning |
| Buick | Special / Skylark | 1966-1967 | 401 V8 | With Air Conditioning |
Fits Years:
1966 1967
Unbeatable Prices & Expectations
We scour the country to find the best deals on NOS and NORS parts so we can pass the savings on to you. Our vintage inventory is acquired from old auto parts stores, warehouses, and private collections. While these parts are unused or professionally rebuilt, their packaging and surfaces may show signs of shelf wear or age due to decades of storage. Rest assured, every part is a genuine piece of automotive history, built to the standards of the era it represents.
