John Brush wrote: > > Anyone have their own testing data for how much power a working fuel pump > draws? > > I am getting conflicting information from manuals on the power draw for a > fuel pump, and would like to hear what others may have tested it at. > > Bentley says 8 Amps, which sounds awfully high. When my pump was not > working, it drew 8 amps, but didn't turn on or pump. It miraculously > decided to start working today, and it draws a nice steady 3 amps. > > Bentley says less than 8 amps may be ground problem. That might explain > some of my "intermittent failure to start" situations, but I would like to > know what folks think of that 8 amp number. Just sounds high to me. > > Thanks much, > > John These numbers sound quite reasonable, assuming the motor was physically stuck when it was not running. An electric motor generally draws much more current when it is stopped or turning slowly than when it is running at a decent speed. The faster it turns, the more "back EMF" it produces from the generator effect. This voltage opposes the applied voltage from the supply and reduces the current flow. Sounds like your pump was jammed up because of a mechanical problem inside or rust, etc. from your tank. If there was a poor ground stopping it the current would be lower than normal, not higher like your 8 amps. Larry A. |
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