why do I have to nurse the last 3-4 gallons into my crv gas tank?

Asked by Feb 24, 2015 at 11:12 AM about the Honda CR-V

Question type: General

My 2008 crv was rebuilt & had been rear ended.  I thought that its nursing problem came
from that accident.  But I just bought a 2012 with 8000 miles on it and I still have this
problem.  What is going on?

2 Answers

148,765

You really don't. When the nozzle clicks off that means the fuel has backed up to the EVAP tube to the charcoal canister. Both '08 and '12 hold 15.3 gallons and as long as it reads full after buying gas, nothing to be concerned about. Now another scenario: it only reads ¾ on the gauge after nozzle clicks off. Then you may have a plugged EVAP tube. When you put gas in the tank, it displaces air and fumes. Instead of coming out in your face and in to the air we all breathe, like the old days before Vapor recovery...that air and fumes is forced in to a pipe that goes to a charcoal canister, that soaks up the hydrocarbons and is purged when engine is started from intake vacuum. If it will not easily accept more than ¾ of a tank, that is what needs to be looked at, the EVAP system. But the thing is, if the tube is clogged, it would have trouble accepting any gas at all. One thing I can think of is that after pumping in 10 gallons or so, the canister becomes saturated with liquid gasoline, then we are back to having the system inspected, the purge valve, and more. An OBDII scan may help, it can probably point you in the right direction ...AND being hit from rear may have crimped that EVAP pipe, it very well may be related to the accident

148,765

IF...That is the problem, the canister, purge valve, solenoid, and sensor add up to a little over $225, and 1.5 hours labor@ $75/hr ($90) = $315 total. If the pipe is crimped, you won't need all that. I didn't draw the circles, the image is from a how to replace, but is 2012 Honda CR- V

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