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Old 04-12-2010, 03:42 PM
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Cool mk3 2.0l jetta fuel pump

hey dose any one know how to test a fuel pump i pulled out my dmm and did some basic test and i have .6v at the pump ,the relay is fine(clicks and internal swiches check out fine), and the fuse is good and is getting power to it but the pump wont kick on and i dont know if .6v is with in spec on the pump i just dont wont to go out and buy a new pump if i dont have too and if anyone has a wiring diagram that would be helpfull as well thanks
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Old 04-12-2010, 06:21 PM
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To test if its working just take the cover plate over the fuel pump off and get a buddy to listen if its running while you turn the key on.

If it doesnt run, then jump the relay socket directly from the battery and if the pump runs then, you can eliminate the fuel pump as problem. Then it becomes an electrical problem.
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Old 04-12-2010, 07:27 PM
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thanks for the info but i just found out what was wrong with it there was some junk that got cought up in the pump so it would not turn over so i reverst the power side to a ground and vise versa this made the pump spin backwords and by doing that the junk that was cought in the pump got dislodged and no it works but still thanks for the info ill use that next time i have a fuel system problem
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