Hello there
you fuel pump relay is called DME relay and it is in your trunk fuse box.Take the cover of and you will see it marked as DME
proporsche
SOURCE: fuel pump relay location on a 1990 mercury grand marquis.
check the fuse .if the fuel pump was bad you blew the fuse . there is a inertia switch in the trunk or under the dash you could check . push the red button to reset relay should be under the hood in the fuse box check your book if you have one.
SOURCE: fuel pump relay location 1990 chevy subburn
One of the easiest ways is to listen for pump to cycle in tank "HUM" when someone cycles key to on. If you hear "Hum" pump is getting power. The other would be to swap it out with another in that area, with same # on it. Under hood, passenger side, on firewall usually. Should be at least one more relay there with same #. There are so many ways that manufacturers recommend for different vehicles, this is usually the easiest. If I can't test for power in & out of relay when key on, I'll go direct to tank sender & check for power there to be sure.
SOURCE: location of fuel pump relay (1990 hyundai sonata)
The fuse box is located low on the left side of the dashboard behind a cover, or at the left side kick panel, behind a cover.
Relay Box
-is located under the left side of the dash as well. 
SOURCE: 1990 Acura Legend, location of main relay for fuel pump
looked it up online, looks like its in the underhood fuse box but couldn't get a good diagram that shows which relay number it is. the website i use is sort of dependent on the manufacturer, apparently acura did not feel like sharing that info. hope that helps
SOURCE: location of fuel pump relay on a 1990 Geo Prizm
under the hood in a fusebox near the firewall
The fuel pump relay should be under the hood on the firewall, square with a 3 in it. Hope you can read it?
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