95 Blazer Fuel pump voltage drop

My wife's blazer fuel pump shows 40-45 psi when starting. It will not run. I put a wire to the test lead for the fuel pump and the pressure ran up to 55 psi. I then could run the engine. I started it with the jumper to the test plug and unplugged it after the engine started.

The engine ran fine for 10 minutes or so till I switched it off. Now the jumper has no effect and I am back to 40 psi or so. I put a new relay in and checked the voltage at the relay socket. One leg is hot all the time and another is hot with the key on. At the pump connector with the key on I only get approximately 9 volts.