you should be able to find a shop manual at the local library with the right information on this -- make copies of the pages, as they are usually for REFERENCE only...:)
on the exhaust
Call OnStar
dexron 3
it is located in the fuel tank
got to this website to find out http://www.md-cars.com/uploads/content/company_Toyota/ES250.jpg
To remove the radio from the 1990 Lexus ES250, first pry the face plate from the dashboard. Then remove the clips that hold each side of the radio. Then, remove the wires to release the radio.
replace upper radiator hose and install a new thermostat. see what happens. or turn it on without the thermostat for a while and see if it still overheats.
how to replace water pump on a 1991 es250 lexus
How do I Reset dashboard warning lights on 90 Lexus ES250
== It's the medium sized black box located under the drivers seat...
same as a toyota, same as any car go to your public library and look up the step by step instructions from the manual there
Without seeing the 1991 Lexus es250, it is impossible to know exactly the cause of the fuel pump problems. A mechanic will be able to look at the car and let you know whether it is a bad pump, relay, or a clog.