Having a fuel delivery problem with an 81 Fleetwood 6.0. The fuel pump relay is not being energized by the ECM. It appears, after looking at conflicting wiring diagrams, that this system does not look at oil pressure sending unit signal. What are the parameters the ECM must/must not see to energize the fuel pump relay? Thank you for any help in the matter as we are hitting a brick wall at the moment.

Phil Hemingway