Not familiar with TBI, but where is the FPR? I think on some motors it was located inside the manifold. When it started leaking it was straight into the manifold, naturally crappy mileage and real rich running were the result.

 

Jay,

A TBI has the regulator on the underside and rear of the throttle body unit - just follow the fuel lines right to it. A TPI has a separate regulator between the two fuel rails.

The TBI regualtor can be adjusted, but requires some modification. If yours has failed, replacement is probably the best solution unless you have some extra time on your hands. There is an article in the Tech Section at the front of the site outlining the procedure.