[hkpga]

Been home about 3 hours. Just walked out in the garage and I heard a low humming sound under and back of CRV. Sounded like a small motor or fan would sound. Started the car and it stopped. Any ideas?

 

[mrtn]

LPG?

 

[hkpga]

LPG?

What is LPG?

 

[mrtn]

LPG as fuel. Liquid Petroleum Gas. It needs to be circulated regularly and the pump hums. That's why I asked.

 

[hkpga]

Regular ole gas............

 

[Traylaw]

See attachment

 

[bandit400]

It is a pump that checks the evap system by applying pressure to the gas tank. It does this approx once a month about 5 hours after the vehicle is shut off.

 

[bearcrkrd]

"Approximately five hours after the engine is turned off, you may hear sound coming from under the vehicle for several minutes. This is the sound of a fuel evaporation leakage check and, it does not indicate a malfunction"

 

[hkpga]

Thanks for all replies! It was just strange to hear. I did read somewhere that the weather conditions can cause and we had a storm today and temperature drop of about 15* and garage still hot

 

[mrtn]

Or we have a Toy Story situation at hand.

 

[cgilley]

My 4-runner did that all the time due to the evaporator return system ...

 

[thomprod]

It is a pump that checks the evap system by applying pressure to the gas tank. It does this approx once a month about 5 hours after the vehicle is shut off.

Thanks for that info. I noticed the same sound a few weeks ago and couldn't figure out what it was.

 

[gordorw]

Been home about 3 hours. Just walked out in the garage and I heard a low humming sound under and back of CRV. Sounded like a small motor or fan would sound. Started the car and it stopped. Any ideas?

 

[williamsji]

Thanks for that info. I noticed the same sound a few weeks ago and couldn't figure out what it was.

I've never actually heard the sound.. but I have seen it activate on my bluetooth battery monitor when I upload the data log periodically as it will draw notable current while active and I can easily see it on the time-data graph. Looks like it normally triggers about 5 hours +/- after vehicle shutdown.. and it will not do it all the time. If I recall correctly, Honda claims it is based on the current level of fuel in the tank.

 

[Golfdonwon]

You would think this would be on the list of things to tell you when the keys are handed over after the sale. I didn't what was going on when i first heard it. A quick Google calmed my nerves but I still wondered why after 100 years of auto manufacturing we now need it.