1. Check the fuel pump itself (if accessible): If you can access the fuel pump (often involves dropping the fuel tank), it will usually have a part number stamped on it. This is the most definitive method.
2. Consult your owner's manual: Your owner's manual might list specifications for the fuel pump, or at least provide details about the engine, which will narrow down the possibilities.
3. Use your Vehicle Identification Number (VIN): Your VIN uniquely identifies your Blazer. You can use this number with online parts look-up tools (like those offered by auto parts stores like AutoZone, Advance Auto Parts, or NAPA Auto Parts). Enter your VIN, select your Blazer, and specify "fuel pump." The websites should then display the correct part(s) for your specific vehicle. *Be cautious*, however, as some sites may offer multiple options depending on engine size and trim level. Always double-check compatibility details.
4. Check with a parts store: Take your VIN to a local auto parts store. Their computer systems can look up the correct fuel pump based on your vehicle's information. They can also help you ensure you're getting the right part.
5. Look at the fuel pump label: Sometimes the fuel pump, or its packaging, might have a sticker with information including the fuel pressure rating or other specifications.
Important Considerations:
* Engine Size: A 1999 Blazer came with various engine options (e.g., 4.3L V6, 5.7L V8). The fuel pump will differ based on the engine. Knowing your engine size is crucial. Check your vehicle's paperwork or the engine itself to confirm.
* Trim Level: While less likely to significantly affect the fuel pump itself, the trim level could influence some minor variations.
* Aftermarket Parts: Be aware that aftermarket fuel pumps exist. While often perfectly acceptable replacements, ensure the specifications (flow rate, pressure, etc.) match the original equipment manufacturer (OEM) specs.
Using a combination of these methods will give you the highest degree of confidence in selecting the correct fuel pump for your 1999 Chevrolet Blazer. Always prioritize using your VIN with reputable online parts look-up tools or consulting a professional parts store.
