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I saw a lot of folks have shared their valuable experience. I like Lil4x writing of his fuel filtering adventures. Since you already bought a new filter, go ahead and change it.
IMHO, the transmission filter/strainer is a more critical issue than the fuel filter because 1) tranny is a source of containmentation, tranny filter is the sole filter 2) one can not control the rate of metal debris, for fuel at least you can change the gas station 3) tranny repair is more expensive than a dirty fuel tank.
FYI. When I change my factory installed tranny filter, except a few metal debris, it looks in decent shape after 68K miles.
I have changed tranny filter twice, plus I put factory new valve body (it is only $500) after replacing the whole transmission. Also magnets were missing for some reason. Plus rear planetary gear mount is welded to tranny case to avoid it exploding again. So no problem there
Interesting, I was browsing Russian Club Lexus forums, and it turns out there are TWO (2) fuel filters, one is nylon strainer (Part #23300-21010) and another one that looks like a big cup (Part #23300-0A020). This is for 2001 RX, not sure how it is for 99-00.
Update:
Correct part numbers for RX300:
up to 05.2000 is #23300-74330
after 05.2000 is #23300-21010 or 23300-0A020
This is how the second filter looks like:
The cost is ~$35
In my 99 manual, I see both of the pieces that you circled in red.
I am really mad. Those manuals from Lexus really suck.
They never proofread them. How in the world can you mistaken a fuel pump with MAF sensor? Lexus/Toyota, get better technical writers! This is pathetic!
For example this one:
Good. Found this picture. Looks like there are 4 parts besides 2 fuel filter that are not reusable and need to be changed. Don't know any part numbers but will try order them on Monday over the phone.
Well a few people who have taken a look at the 99 versus later manuals noticed th mistakes and lack of detail in the first versions, including spelling.
Ah, the dreaded "push the button not more" syndrome - caused by literal translation of the manual - resulting in Engrish. I imagine the transposition of the drawings was caused by a layout artist with absolutely no knowledge of the product - it happens regularly, but is usually caught by proofreaders.
I just finished helping some friends with a manual, and can testify that after looking at so many pages long enough, they all start to look alike. I sympathize with the writer.