Here is a way to check out the glow plug relay.
To do a quick test of your glow plug system locate the glow plug relay under the engine cover (plastic hood looking thing on top of the fuel filter, draw a line from center of filter to right headlight and the relay is about 6” from the filter...
I've got 3.55's in my '97 4wd 7.3 and have been getting constantly 14-15 mpg in the city and 16-18 mpg highway. That is with 3-4" straight pipe, Tymar intake, regulated return, electric fuel system, TS chip, and a heavy foot.
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