Is the 1990 Chevy van G20 carburetor or fuel injection?

The 1990 Chevy G20 van could have either a carburetor or fuel injection, depending on the engine option. Some models came with carburetors, while others had throttle-body fuel injection ( TBI ). You'd need to check the vehicle's documentation (like the owner's manual or the VIN decoder) or look under the hood to determine which system is installed.