Yes Daz that's normal on metering flap, so Pump could be down on pressure, you check the pressure at the 5th injector , depending on what Gauge you get you might have to get adapter from 5th injector to your Gauge your looking to see 85/90psi Pump relay bridged , the Pump could have picked up a lot of " Crud "...rust...as the Tanks rust from the inside over the years, This why I wanted you to keep the 5th pipe on injector whilst you were cranking...pressure only needed 40psi to overcome the 5th, so this will tell you something, also before doing a 5th Test ensure you have 12v on cranking engine actually at the injector Blue plug, as we know previous owner been messing with the negative side of the circuit which the Thermotimer controls. if no 12v on cranking...get back to me on how to sort. Peter