Not much information I'm afraid but it may help.
"Thunder Monsters Over Europe" lists 2Lt Glen M DuMars 509th FS with a hometown of Albion Pennsylvania.
Cause of his bail out into the channel is atributed to engine failure, and due to the rough seas the Walrus that picked him up couldn't take off and had to taxi back to England.
There is a very good 405th FG website, even better if you speak/understand French fluently but I'm sure people here will be able to help.
http://wing.chez-alice.fr/USAAF/405th_FG/405th_FG.html
I can't say for certain if its the same person, but found this obituary. There can't have been too many P-47 pilots named Glen M DuMars though, and the birthplace of Greenville in the obituary is only about 40 miles from Albion.
ADRIAN, Mich. —
Glen M. DuMars passed away on Wednesday, Feb. 18, 2009, at his residence in Adrian. He was 89.
He is survived by his wife of 63 years, Nina; son, Greg (Debbie) DuMars, of Adrian; four grandchildren, Doug (Kim) DuMars of Glenville, Ill., Amy DuMars of Denver, Colo., Karen (Steve) Dunham of Tecumseh and Michelle (Erik) Koppin of White Lake, Mich.; three great-grandchildren, Alexa and Jonathan DuMars, and Luke Dunham. He was preceded in death by his daughter, Donna DuMars.
Glen was born and raised in Greenville, Pa., where he attended Thiel College. He was a P-47 fighter pilot in the Army Air Corps during World War II. He married Nina in 1945 and returned to college and received his B.A. in accounting from the University of Pittsburgh. He was employed at U.S. Steel in Pittsburgh, Pa., and Saxonburg, Pa., where he retired after 35 years of service. He was a 25-year member of the National Association of Accounting where he also served as President. He served as Elder in his Church and was a 32nd Degree Mason.
Glen was also active in his community, in the Boy Scouts and Treasurer of the volunteer fire department in Saxonburg, Pa. He retired and resided in Clearwater Fla., for 30 years where he volunteered as Usher for 24 years at the Ruth Eckerd Hall Center of Performing Arts. He was President of the condo association and an avid golfer. Glen and Nina moved to Adrian in the fall of 2007 to be closer to family.
In accordance with Mr. DuMars’ wishes cremation will take place and there will be a memorial service at a later date. Arrangements by Burden & Son Funeral Home, Jackson.
Hope this is of some help.
Nige
www.56thfightergroup.co.uk