Just replaced the rear (tank) pump on the '87 Bronco. Old one was shot. Fuel rail pressure was about 50 psi for the few minutes it would run. With new tank pump the pressure is about 80 psi. Is this a bit high?? Also the fuel system will not hold pressure, i.e., as soon as ya turn the engine off, the pressure drops to zero. Any body know what the correct pressure should be??