Yes, that is what I have reasoned on this. We seldom fill beyond the Inboards, and shortly later they spillover. Which we can live with. It is pretty clear there is no sender in the outboards. However even when the outboards are dry, and down to about 10 in the Inboards, it still is not reading correctly. Will be working with the A&P to at least check the senders. Sounds like there may be a ground problem. I'd be happy with a semi-accurate read of some kind...At least be correct once the outboards run dry....