A fuel pumping unit has a low pressure pump, a high pressure pump, and a drive input which drives the low and high pressure pumps. The low pressure pump supplies, in use, fuel at a boosted pressure to the high pressure pump. The fuel pumping unit further h...

An engine fuel control system includes a fuel metering valve operable to control the flow of fuel between a supply line and a delivery line. The fuel control system further includes a pressure drop control arrangement operable to regulate a pressure drop a...