According to my Chilton's Auto Repair Manual :
For a 1989 Mercury Topaz ( front wheel drive )
( 15.9 US. gallons )
It's in the gas tank.
where is the fuel reset swith for a 1989 mercury topaz
it will be in the fuel tank.
Feul filter for 89 topez is mounted on the passengers inner wheel well
location fuel pump relay 92' merc topaz
Inside the fuel tank.
4
60 to 65 Liters. that's around 13 to 14 imperial gallons or 15 to 17 us gallons
If your 1989 Mercury Topaz starts but won't stay running, you should check the fuel system, including the fuel pump, fuel filter, and fuel injectors. Additionally, check the ignition system for issues with the spark plugs, ignition coil, or ignition module. Finally, inspect the air intake system for any blockages or leaks that could be affecting the engine's ability to run smoothly.
Sorry , no ansewer because no Topaz 1995 ; last production was 1994.
Should be just one.
The 1991 Mercury Topaz has a fuel tank capacity of around 13.5 gallons.