We have a 2003 E350 V10 converted by QuadVan in late 2003/early 2004. Thyey installed the TF 46 Gal tank to replace the 35 gal stock tank.
Door sticker for TF is EO D288-35 which does list my vehicle as compliant.
Link to check the Executive Orders is :
http://www.arb.ca.gov/msprog/aftermkt/d ... mquery.php
Read carefully to make sure your year and model is covered.
I also looked at EO D288-41 and it looked like it covered my vehicle as well. Hope I do not have issues when I go to get smog checked. As it is, I have to go to the referee every two years due to a code looking for two more O2 sensors that never existed on my van. Last year the referee did not say anything about the gas tank. I am good through March 2015, so it will be next year before I find out if any issue.