switch on the fuel pump

so my girlfriends car has a switch on the fuel pump its connected to the gauges and sometimes the check engine light comes on. the code reads out as fuel pump how would i change it back to regular oem thanks
her car is a 90 rs with a 3.1
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.