Last post on Sep 10, 2013 at 10:51 AM
You are in the Lexus RX 300/330/350
What is this discussion about?
Lexus RX 350, Fuel System, SUV
#13 of 16 Noise Under Car
May 11, 2012 (4:58 pm)
My RX350 has a noise that sounds like a small motor running coming from underneath the car at times. The car may have been sitting for hours and when I walk by the car I can hear it running. I can't locate the source but it sounds like it is coming from around the rear of the car by the muffler or the fuel tank. Any ides?
#14 of 16 Re: Noise Under Car [randy114]
May 12, 2012 (5:01 am)
It is just a small fan which purges the vapors from the fuel system. It runs whenever needed. Can be spooky to walk out to your garage after the car has sat for hours and hear it running though.
#15 of 16 Re: Noise Under Car [kwbuggy]
May 13, 2012 (6:23 pm)
Thanks! I was worried that it might run the battery down.
#16 of 16 Re: Fuel for the RX 350 [smarty666]
Sep 10, 2013 (10:51 am)
I have a 2010RX 350 and never noticed any difference putting regular or premium fuel and did numerous MPG test - no difference. Performance no difference. And to the point of voiding a warranty how would anyone be able to determine. My service advisor told me she has a 350 and uses regular gas and she talks with certified service techs everyday. Here some math. I drive 25000 miles a year
25000/22 mpg= 1136 gallons per year x 5 years = 5681 gallons
5681 gallons times .35 gallon= $1988 savings. That's worth thinking about especially since there is no improvement on gas mileage or decrease performance. Consumer reports advises the difference between high octane gas "recommend vs required" such as a turbo engine. Just saying if there is no clear advantage why spend the money?