Originally Posted by cal2vin
The wire on the fuel pump sender IS running to a relay that is just in the ground line of the VSR (another picture). So its only drawing <150 mA for the relay coil like you said. But I realize there is still risk of spark and ignition of fumes the way I have it wired.
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I have never seen a fuel tank sender pass the signal through a relay. That adds a connection that could become corroded, increasing in resistance and altering the reading. The fuel pump's power wire is switched by a relay, but that's because it IS a power wire and the ECM controls when it's on or off. Signal sires aren't sent through relays, as a rule, and it's very odd to see a relay on a ground wire. Those are usually fixed because lifting a ground can cause all kinds of problems.