Ah - and HWB has explained why. Also explains why you can hear your pump (when it works) and I can't hear mine.Well it hasn't-the tank is sideways on driver side-runing under the driver and passenger seats which imo opinion is dumb as hell-most of the time you have 100kg driver with over 100 liter tank on one side of the vehicle.
If as per my Suburban, the pump +ve feed, ground, and gauge wire all bundled together and run all the way to the engine bay.I can't find any info on grounds location on tahoes-apart from obvious ones.
Couldn't a poor connection with increased resistance be the cause of that? Or, a goosed motor I suppose. I'd look for a resistance value across the motor with a multimeter (in the absnce of a 'scope) for a ballpark figure and try and relate it to the pump motor's power output.Found this online-I must say that my relay can get quite hot
There's also the oil switch aspect - which I'm not overly familiar with - that should allow a running engine to continue running even with a bad relay. The relay isn't hard to bypass by bridging the relevant connections with a jumper wire (for test purposes).