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Engine shut-off after couple of seconds on 1993 BMW 850Ci

Hi, I have a 93 850ci that has problems with the fuel pump and after I replaced it the engine runs for a few seconds and after that it turns off. It seems like some electric relays are shutting off but I am not sure what the exact problem is. If anyone could provide some insight it will be much appreciated.

Asked by for the 1993 BMW 850Ci
Probably the fuel pump relay. Remove the relay & temporarily jump the terminals with wire & spade connector jumper. If motor runs ok, renew the relay.