I purchased my 89 Graduate 3 months ago; the car has 96k miles and I have been replacing parts and hoses in an effort to make it road worthy. I replaced the O2 sensor with a Bosch 3 wire unit. The PO had used a one wire sensor and I know that CA emissions require 3 wires. So I started the car and it ran for about 5 seconds then the fuse at the fuel pump relay blew. I disconnected the plug with two white wires and the car ran ok but a little rich. What would cause the sensor to blow the fuse? I would really appreciate your help, O wise ones. This was originally a California car that was taken out of state for 10 years.