evap system not completing and gas pump turning off

modelageek · Dec 10, 2014

I am having an issue with the 2004 in my sig. New motor installed from an 09 a week ago. I have never driven the truck until the motor was put in so I am not familiar with any previous issue. The truck had a 5 month old current inspection sticker on it when I bought it with the bad engine(timing chain failure) I have driven it for about a 6 days and 300 miles. The evap system will not complete. I have no codes. I also noticed that the gas station pump will shut off when filling the tank. I have to fill it slower to keep it from shutting off. my guess is that the 2 are related. It's been pouring out for 2 days so have not had a chance to look it over very well. I did look under the hood and the hose from the Tb to the solenoid on the drivers fender is connected along with the hose that runs to the back of the truck from the solenoid. I own an air compressor if needed. all thoughts are encouraged.

RonD · Dec 10, 2014

EVAP system will often fail test if below 30% full and over 70% full, just FYI.

Slow fill could be related to EVAP test failure if vents are clogged.
But first look at filler hose, they can get a slight twist that doesn't look like much but will cause the slow fill issue, loosen clamp at the tank end turn hose, retighten.

I believe there is a fuel tank vent hose that opens when key is off, then closes when key is on to allow EVAP system to work.
This vent hose/solenoid is by the fuel tank and can get clogged with debris so tank can't vent air as fuel is added, this could also cause EVAP test to fail.

modelageek · Dec 10, 2014

RonD said:
EVAP system will often fail test if below 30% full and over 70% full, just FYI.

Slow fill could be related to EVAP test failure if vents are clogged.
But first look at filler hose, they can get a slight twist that doesn't look like much but will cause the slow fill issue, loosen clamp at the tank end turn hose, retighten.

I believe there is a fuel tank vent hose that opens when key is off, then closes when key is on to allow EVAP system to work.
This vent hose/solenoid is by the fuel tank and can get clogged with debris so tank can't vent air as fuel is added, this could also cause EVAP test to fail.

thanks Ron. The fuel filler and vent for the filler appear to be a straight shot to a 90 fitting and into the tank. they look OK. As soon as it is dry out I will crawl under and take a look at the canister. I have a compressor and I might try and blow threw some of the lines and see if that helps. If it doesn't complete hopefully it will throw a code to help narrow it down.

modelageek · Dec 17, 2014

I removed the filler vent and blew air through it. I also removed the hose and the canister and blew air through that. It seems to fill up better now. Only stopped once out of 3 refuelings. The system is still not ready abd there are no codes after 600 miles. What could make it not complete and not throw a code?

adsm08 · Dec 17, 2014

Get it to half a tank, reset the computer, leave it sit for two days undisturbed. That should be enough to set the evap monitor. It is the only one that can run with the key off.

If it doesn't set after that you may need to take it somewhere that can run an on-demand evap-test.

modelageek · Dec 17, 2014

Thx adsm. I'll report back after I do it.

modelageek · Dec 26, 2014

adsm08 said:
Get it to half a tank, reset the computer, leave it sit for two days undisturbed. That should be enough to set the evap monitor. It is the only one that can run with the key off.

If it doesn't set after that you may need to take it somewhere that can run an on-demand evap-test.

SUCCESS!

Thanks Adsm08 and RonD. I reset the puter with my scanner and let it sit for 2 days. Then over the next week I made a few 20 mile highway trips starting from a stone cold truck. Just today on about the 4th trip the evap system completed. Waiting on line as we speak to get the truck inspected.

Thanks again!

evap system not completing and gas pump turning off

modelageek

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RonD

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adsm08

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