Well, Michigan45MB, I'm going to stick my neck out here and tell you your MB appears to be a late January 1943 MB, possibly a complete MB-NOM-12 to be exact, but only more investigation will determine that. It would be helpful if you found and posted a photo of those MIA data plates, specifically the nomenclature plate that has you jeeps infomation stamped on like this one from Dinos! site:
MZ radio jeep owners are scattered all over. Is the jeep still in CA or is it now in Michigan?
I can help you out with items specific to the radio jeep. Here is mine.
If you have technical questions about your brakes and fuel issue ask them on the Technical board. For items on the radio jeep post them on the USMC/USN forum.
Oh, you need to get some manuals and a few books, Ren's WWII Jeep Guidebook is the best place to start.
Ron Fitzpatrick, the owner of this site has any parts you will need...
Finally, you need to drain the gas tank, there is a plug that is accessable from the back. Your fuel lines have been changed from original so you may just need to change that plastic fuel filter