Thank you subford and Conanski. Great information, even if isn't "replace a 10 cent item and you are good to go" like I was hoping! LOL!

This is a 93 F series - I need to check my records to see if recall work was done. But that is more of me being curious, since this is long out of warranty.

I guess for the time being I will keep using the front tank first, and then amuse myself by watching it magically refill when I use the rear. I know I have another pricey repair in my future, but I'll postpone it as long as I can.

Thanks again for all the helpful information!