i had same problem and could i hell as like figure it out for weeks first of allmake shure plenty of fuel in car because if there is only a bit it can affect fuel pressure also have you had car in bits at all cos a bad earth could cause switch not to activate valve in metering head (that was my problem in the end lack of fuel altho there was plenty in and bad earth to ecu) i thought mine was nackered and 100 quid and 2 good metering heads after i got it working so if it is nackered i have 2 which i no works as i checked them on my car