Remove the filter again and put it back on. Remove the return line and see that you have a fuel flow. Sounds like you are getting air, causing a surge and overspeed indication. Could be a cracked line or a loose fitting fitting. It is real easy to screw up those filters the way they are made. Obvious reason is it has enough fuel to run 5 min so you et full flow but maybe the filter is emptying out due to leak before it. Check the oil and make sure you have it full of coolant. Sometimes computers lie. They are taking over the world as you can see. Keep it simple. Just trace it back.
