Stumped
Hey what are you doing tomarrow
!! LOL !! Wish I could. I guess you are in Yakima? Long ways from Coeur d Alene. It'd cost you more for a bus/train/plane trip to get me there and back than hiring local talent.
Years ago I did a "little" upgrade on the 911 dispatch center furniture over there. While I was in dispatch working, I overheard the following one sided 911 call:
"911, what is your emergency?"
"Duct tape?"
"On the hood?"
"So let me get this clear, you say she is DUCT TAPED to the HOOD?? And they are driving up and down the street that way? Officers are ON THE WAY"
"Central, any available unit code three, vicinity of AAAA and BBBB streets.........."
Get another jumper wire and add a second ground from the sender housing to a good clean chassis ground just to eliminate that as the problem. Grounds on those tanks can be tempermental.
I thought he already addressed this, but it never hurts to double check. That is, however why I asked him to check voltage, key on, from sender flange to a good body ground