If you have a service manual, you can pull out the relay and simply jump two
terminals to power your fuel pump temporarily.
Just look at the relay... it will say "kickdown" on it and then look at the
date stamped on the side of it... If it is the same year as your car, you
need to change it.
Otherwise, if you do have technical knowledge, you can take it apart and
reflow key joints and clean the relay contacts.