Ford Fiesta ST P2636 Fault Code. ( Fuel pump #B low pressure range performance )

Hi I'm Matt, in this video I am looking at why a fiesta st is running rough and cutting out. The car had already had a high pressure fuel pump. I carried out test to make sure the high pressure fuel pump was being controlled when the high pressure rail was loosing pressure right before the engine cut out. Then I checked the low pressure fuel delivery with a mechanical fuel gauge, and compared it to the low pressure sensor reading. Thanks for watching