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I was making a list of all the stuff I should be checking up on. On my 92 flareside does it have two pumps or just one? The reason I ask is it seems to have more power when on the front tank then back. My friends say it is in my head, and maybe it is, but a pump that is partailly cloged or going out would suck power, right?
Mine has a pump in each tank. On earlier models I am not sure. You might check along the frame rail and see if there is a pump there. If there is, then that is probably it. Sorry I couldn't answer with more certainty.