My 1996 XJR recently started misbehaving under hard acceleration. At About 3500 RPM there would be a sudden loss of power. this also occurred if I cruised up to that RPM. From searching this forum I narrowed my problem down to possible secondary fuel pump issue. The issue was cured by swapping the relays with my spare XJR. when i had the fault the car started as normal, which threw me a bit as I understood the secondary pump also assisted starting.

My question is: which of the two turquoise relays is for the secondary fuel pump? and what is the interaction between the two fuel pump?

Thanks to all who share there knowledge on this forum without which my XJR would have been consigned to the scrap yard long ago.
Regards
AVRO RJ

 

The electrical guide has a section in the beginning listing the relays and the location placement in the car.

bob gauff