Sorry that you’re having issues with your Jag!
The 1998 Jaguar XJ8 fuel pump relay is located in the trunk fuse box. The lid of the fuse box should indicate which component is the fuel pump relay.
Before you start tinkering with the fuse, check if your Jag also has the following symptoms:
The fix could be as simple as replacing the fuse. However, if that doesn’t work, book an appointment with a trusted mechanic to get the issue diagnosed. Not only will this give you peace of mind, but will also catch problems before they manifest as an expensive repair.
The average Jerry user saves over $800 a year on car insurance!