Where is the fuel filter located on a 1990 toyota 4runner?

Located above the starter

IF you have also changed the filter then add 4.5 litres of oil and check level after running engine for 20 seconds or so. Top up as needed.

with many new modern fuel injected vehicles its hard to give them a tune up without plugging them into a computer or getting an aftermarket computer chip and programmer.

however, if your toyota is running a little rough and getting bad gas mileage i would reccomend a new set of spark plugs and wires. and maybe a new fuel filter, i would do the spark plugs first, if the results are not satisfactory then change the spark plug wires, and if the results are still not up to your standards comparing the way it used to run to how it runs now then change the fuel filter. doing all these things will make the vehicle run clean and efficient like it should. and if it doesnt than im sure you have a vacum or oxygen sensor problem.

just wanna hop up the performance a little bit and get better fuel mileage?
then i would suggest and personally recommend a complete K&N cold air intake kit.

The plastic washable/re-usable fuel pump filter (inside the gas tank) is in excellent ... 4-Runner

The fuel filter is in a metal cylinder, located either on the rear frame rail or in the engine compartment, depending on the Model Year and vehicle. You may also find it under the injection manifold on some models.

The fuel filter is located under the vehicle on the rear frame rail.

remove the inlet pipe to the fuel filter first , turn on the ignition it should pump fuel out if not pump in tank should have filter on it clean out

should be located passenger side under vehicle near seating area, mounted on chassis.

The starter on a 4runner is on the LHS of the car at the back botton of the engine on most models. Please give engine details to confirm location.

Under vehicle, passenger side, below seating area, front of fuel tank, mounted on chassis

that figures to 13 miles to the gallon you should be getting better than this check the air filter plugs and fuel filter may be time for a tune up o2 sensor might help also