If you are using excessive fuel, it could be a few things. First, is the air filter clean? Also, have you checked for any engine vacuum leaks that may cause the computer to add fuel to the engine?
Also, I want you to try something. Here is a link that explains how to retrieve codes. This vehicle has an OBD1 system which doesn't require a scan tool to get codes. Follow the directions in this link and let me know if there are any codes stored:
Also, the fuel pressure regulator is dependent on the engine vacuum to function. It is located on the fuel rail. See pic below. Confirm the vacuum hose to the regulator is connected and not damaged. With the engine running, you should feel a constant vacuum at the end of the hose, so confirm that as well.
Let me know what you find.
See pic below.
Thursday, July 28th, 2022 AT 2:46 PM