CO, I did a little autopsy and carefully removed the plastic cap from my original thermistor. It looks like a very simple single wire resistance, and it was broken off the bottom (pic below) . I found no resistance in removal of the plastic cap and the end of the wire is bent up slightly and seems melted, so I'm quite sure I didn't brake removing the cap. I had also measured resistance with my dvm before removing the cap and got 0.0 Ohms reading.
There are clear numbers on the side (see pics) and in contrast to the Z Car Depot unit, the 3 holes on the bottom are a bit larger in diameter, there are 2 additional holes on the sides, and the hole on the plastic cap is also larger. All the holes in the can are screened.[mention=1115]Mark[/mention] Maras suggested that perhaps the small holes on the top of the Z Car Depot unit weren't allowing air to escape and impeding fluid from rushing into the can from below when submersed. Before disassembly I experimented by comparatively dunking both thermistors in a clear glass container full of water. You could see air bubbles escaping readily from the top of the original unit as it went in. Not so with the ZCD thermistor. I had to shake it and tap it so air would escape. This validates Mark Mara's observation and what you and Dave had suspected at times, that maybe fuel wasn't getting inside the can properly.
Please refer to one of my previous posts (# 82) for pics of the ZCD thermistor details.
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