I drive a 91 Areostar with a 3.0L engine... most of the time it averages between 22 to 25 mpg
The 1990 Ford Aerostar Maintenance Information manual says 21 gallons.
In a 1990 Ford Aerostar : You either have the 3.0 liter V6 engine or the 4.0 liter V6 engine from the factory ( each size of engine has 6 engine cylinders )
Prius in IL, winter 43 mpgs and summer 55 mpgs.
It might fit but it will take you a while.
The proper gap for 1990 aerostar spark plug is .044. This was taken from Dept of Motor Vehicles in Delaware. - Bill R. Jr.
You have a 21 gallon tank.
It's inside the gas tank
The distributor for a 3.0 liter in a 1990 Ford Aerostar rotates CLOCKWISE ( looking from the top ) The spark plug firing order is ( 1 - 4 - 2 - 5 - 3 - 6 ) The engine cylinder locations are numbered : 3 - 6 2 - 5 1 - 4 front of Ford Aerostar
Ford stopped making the Aerostar in 1997
20 - 30 mpgs depends if you drive on highway or cities
Check the fuses first!
21 gal. probably, full it up and see.