Where is the fuel pump reset switch in a 1999 Mercury Mountaineer?

There is no fuel pump reset switch in a 1999 Mercury Mountaineer (or in most modern vehicles for that matter). Fuel pumps are generally controlled by the onboard computer and are not manually resettable via a switch.

If you're having fuel delivery problems, the issue is likely more complex and could involve:

* A faulty fuel pump: This requires replacement.

* A clogged fuel filter: This needs to be replaced or cleaned.

* A problem with the fuel pump relay or fuse: These can be checked and replaced if necessary.

* A problem with the fuel pump control module: This might require diagnostics by a mechanic.

* Low fuel pressure: This may indicate other fuel system problems.

Instead of looking for a reset switch, you should have the vehicle diagnosed by a qualified mechanic to determine the root cause of the fuel delivery issue.