I have a 88 F250.....Fuel Pump runs constantly...even with key off. Replacing pump did not help. Also have a problem with steering column. It will not engage the starter switch. Something keeps draining battery???? This started after replacing fuel pump and starter switch.....

Locate the fuel pump relay by looking at the inside of the fuse box cover or the owners manual. Remove the relay and see if the pump stops. If it does, then locate another relay in the same fuse box that has the same part number on it and is not required for engine operation like a wiper motor or AC control relay. Install that relay in place of the fuel pump relay and see if the pump continues to run. If it doesn't then start the engine to verify proper operation. If it runs OK, then shut it off and check to see if the pump is still running. If it's not still running then replace the fuel pump relay. If it still continues to run then the most likely cause is a shorted wiring harness. The harness usually runs along the floor board and can short out by making contact with the vehicle body. As for the steering column, try this if the gear selector is on the column. Grasp the selector lever and pull up on it while trying to start the vehicle. If the vehicle now starts then column linkage is worn, a common problem with ford column shifters.