mercedes 280CE 1977 european no start of fuelpump at ignititon ;

engine have fuel pressure ,pump starts when airmassplate is pressed or fuel cutoff relay manovers(disconnecting contact on fuel distributor) I have two relay in standard in relay box located in engine bay ,one is fuel cutoff relay,cannot find any other relay that seems to relate to fuelsystem. need urgent help

engine have fuel pressure ,pump starts when airmassplate is pressed or fuel cutoff relay manovers(disconnecting contact on
fuel distributor)
I have two relay in standard in relay box located in engine bay ,one is fuel cutoff relay,cannot find any other relay that seems to relate to fuelsystem.
need urgent help

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