Do flex fuel pumps come on a z71 Chevy Avalanche?

No, the Chevrolet Avalanche Z71 did not come standard with a flex-fuel capable fuel pump. While some Avalanches were equipped with engines capable of running on E85 (flex-fuel), the fuel pump itself wasn't specifically a "flex-fuel pump." The difference lies in the materials used in the fuel system to handle the higher ethanol content. A standard fuel pump *might* work with E85, but it's not designed for it and will likely degrade faster. A flex-fuel vehicle has a complete fuel system designed for E85.

To determine if *your specific* Avalanche Z71 is flex-fuel capable, you need to check the following:

* The sticker on the driver's side doorjamb: This sticker lists the vehicle's specifications, and it will indicate if it's a flex-fuel vehicle. Look for "E85" or a similar notation.

* The fuel filler door: A flex-fuel vehicle will usually have a sticker on the fuel filler door indicating E85 compatibility.

* The owner's manual: Your owner's manual will specify the type of fuel your vehicle is designed to use.

In short, the engine might be capable, but the presence of a specially-designated "flex-fuel pump" isn't the determining factor for an Avalanche Z71.