There are a couple of possible causes. I have found many older subaru's end up with poor ground connections for the fuel pump. Have the shop that changed the pump test the connection at the sending unit which is located behind the back seat under an access cover. if the connections are good then check the fuel pressure regulator. it uses rubber seals and they fail with age. lastly if the above items are good i suspect the fuel filter might need changing.
SOURCE: How do you replace the fuel pump in 1992 2wd Subaru Legacy Wagon
SOURCE: Cause of noise in front differential of 1997 Subaru Legacy Outback.
there is a plug on the shaft-side of the differential. Using a ratchet remove the plug and with the engine OFF, stick your finger inside the hole and you should get fluid just below the threads of where the plug goes in.
SOURCE: 1998 Subaru Outback Wagon Grinding Noise/Squeaky Brake/Gas Gauge
The first issue, I would have the brake calipers checked for either a pin stuck or one of the pistons stuck, It is a dual piston caliper and sometimes one will stick causing pad to angle slightly. While inspecting the brake issue also check your wheel bearings, which may be the squeak. On the fuel issue, I will tell you a secret, LOL, but Subaru has set the fuel gauge to read E but still have about 5 gallons of fuel left. I use US measurements, but trying to use my head I believe you are getting about 22-24 MPG from what you said and that is pretty good. I hope this helps a bit and have a great day.
SOURCE: how to replace fuel pump on 96 subaru legacy
the fuel pump is located in the fuel tank, that tank must be pulled to do this. the procedure for removing the tank and pump are very little changed from car to car, here are a good set of general instructions with photos.
http://www.aa1car.com/library/fuel_pump_replace.htm
SOURCE: Timing Belt replacement diagram for 1997 Subaru
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