Originally Posted by
THEFERMANATOR
No, the transfer pump will look for change in the primary and secondary level units. If it doesn't see the secondary level showing the level dropping, and the primary showing the same or increasing, it will most of the time default your fuel gauge to empty, or shut the transfer pump off thinking the transfer pump relay is stuck on. I ran into this on a DURABURB tune I wrote. On the economy tune he goes so far before the level really changes, it causes all kinds of issues. That and at first he had the stock Y to the 2 tanks which allowed fuel to slosh forward, and when it saw this, it would disable the transfer pump. it is a finicky system to say the least. That, and you have to have a cab and chassis fuel segment for the ECM to even enable the transfer pump.
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