Hello group, I have a 2008 RX350 with 227,000 miles. Out of the blue a couple days ago, I cranked up but the motor would not fire up. After 2-3 tries, no go. I decided to attach my cheapie code reader to see if I had any codes. I turned on ignition, then decided to crank again. It fired up. I had no codes thrown or check engine light on.
after going down the google-hole, I learned that a failing fuel pump relay could be the cause. I now know that there are two fuse/relay boxes under the hood and one under the driver dash. None of these seem to contain a fuel pump relay? Seems that I read that a 2008 had it in a different location?
i can test/replace it IF I can find it.
Any clues/ideas would be appreciated.
So far, the car has started and ran every time I've tried it. I'm bewildered and don't want it to let me down!

 

This shows both relays related to the fuel pump
https://www.japan-parts.eu/lexus/us/...jection-system

Where is this box? Drivers side kick panel (or under hood?) the diagram isn't clear. So you had a crank no start condition correct?

 

Yes, crank no start situation that has gone away.
This diagram is quite confusing still...🤔

 

Bingo! I found the relay box. It is behind the drivers side fuse box and under the brake fluid reservoir. I will investigate tomorrow.
That being said, the car has started up everytime after the one no start situation.