How To Change A Lexus GS400 SC400 LS400 Fuel Filter

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Things you will need:

  • Fuel Filter (about $19.99)
  • 19 mm wrench
  • 14 mm wrench (Flare Nut Wrench is PREFERRED)
  • 10 mm socket

 

    1. Things to know:

      It’s a bear to get to the filter the first couple of times until you get it figured out. You will just have to discover it – no way to tell you how to get that filter out with out spilling fuel, but it can be done (Or so Fitch says, but I always use the water drain to empty most of the fuel from the filter and then still manage to spill some!).
      I actually lean/reach in over the front of the truck, almost lying on the engine, so I can get my right hand in there – its more coordinated than my left hand. (Note, if you lean across the battery, cover the top of the battery to protect your clothing from acid and your *um jewels* from an arc welded belt buckle.)

      The priming pump is on the drivers side rear of the engine down low about right over the top of the starter motor. It has a plunger on top that you push on to pump fuel into the system and purge the air out. If you fill the filter really full, you probably won’t need to mess with this. If you don’t, you will get to learn all about it.

      The filter will be tight. Very tight! A flimsy gas engine oil filter wrench will bend without removing the filter. A nylon strap wrench will remove the filter after it crushes the filter can enough to get a good bite.

      Procedure: (Should be written on a little piece of paper that comes with the filter.)

      1. The best way to attach this task it to jack the car up on the rear driver side with tire chocks in the front tires.  Once the car is jacked up, then u should put in a jack stand for safety.


 

    1. The next thing is to open up the gas tank cap where u
      filler gas every other day.  When u open the gas tank
      cap, fuel pressure will escape and reduce fuel pressure.
      This procedure is essential when the fuel filter is loosen.
    2. The fuel filter is located under the car.  Its on
      the rear driver side of the car.  Its right in front of
      the driver side rear tire.  There is an aluminum plate
      covering it.  The plate is held by 5 10 mm nuts.


    3. After the above plate is removed, then you see the fuel
      filter.  The filter is bolted down by two 10 mm nuts.
      Those nuts need to be removed in order to take out the
      filter.  Once you remove the filter, then will be some
      fuel leaking out.  Don’t worry it should stop after
      20-30 seconds or so.
    4. Its an inlet fuel filter with one entering and one going
      out.  Now you will need the 19mm to stabilized the
      filter and 14mm to loosen the fuel line.  You need to
      loosen both inlet and outlet lines.  Once the filter is
      out, you will need to loosen bracket with a 10 mm.
    5. Now you are ready to install the new fuel filter.
      Make sure the ARROW is pointing from the REAR to the FRONT.
      Basically the large end is at the rear and small end will be
      pointing to the front.  Look for the ARROW for
      indication.  The best way and easiest way is to loosely
      screw in the fuel lines first (not tighten), then you will
      need to install fuel filter and bracket back with two 10mm.
      Tighten the two 10mm then tighten the two 14 mm fuel lines.

 

  1. Before putting the aluminum cover back or lower your car.  Start your engine and check for fuel leak.  MAKE SURE YOU DON’T SEE ANY FUEL LEAK WHEN YOUR ENGINE IS RUNNING.  If there is fuel leak, tighten the 14mm by stabilized the 19 mm from the fuel filter.  Make sure everything is ok before putting the cover back or lowering the car.
  2. Now you are ready to put the cover back.
  3. The whole task should not take more then 30 minutes.  If you take more then that, then you are doing something wrong.  Best of luck and have fun.
Do you have any questions? If so, please head over to the forums to get a quick answer or share your experience!

This is a freelance site with no support by huge companies.  I have been doing most of the R&D and technical write-ups by myself with my personal money and literally thousands of hours of my time.  I have taken extra steps to demonstrate in details how things are done.  Currently I am one of the few people doing Lexus V8 research and performance enhancement.  This effort comes from my personal love for this wonderful engine.  Most of the modifications are from trial and error. There's no cookbook for 1UZFE mods and its unknown territory for much of supercharger performance.  The parts, labor, web development and site hosting are 100% paid from my personal hobby money.  If you feel my efforts help you in any form, please do not hesitate to donate any amount of money to support this site. You have no idea how much I and the entire Lexus and Toyota community appreciate it!

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