Question about Harley Davidson FXSTB Night Train Motorcycles

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Trying to locate the fuel pump relay, not sure where to start

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  • wd4ity
    wd4ity Aug 24, 2010

    What model bike?

  • dave6236 Aug 24, 2010

    Sorry I have a 06 Harley Davidson Night Train

  • dave6236 Aug 24, 2010

    Thanks

  • dave6236 Aug 24, 2010

    Yea those two things were my next options, pressure test and voltage on the pump... thanks again for your help steve. Really pointed me in the right direction...

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  • Master
  • 4,565 Answers

Ok, I'm going to take a guess here that it's under the seat or on the leading side of the rear fender. Since I'm not a Harley mechanic, I don't get to mess with the newer bikes. Seems the owners of the newer bikes want the dealership mechanics to work on their bikes. So, this is a "best guess

Posted on Aug 24, 2010

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  • wd4ity
    wd4ity Aug 24, 2010

    Ok. look at this.

    http://www.bikebandit.com/2006-harley-da...



    The top of the drawing appears to the forward end of the bike as viewed from above. Click on open and print this drawing, it's much bigger and easier to see. It shows a "relay fuse block" with two relays on it. One is the starter relay and the other is a "system" relay. Now, whether or not this is a fuel pump relay, I have no idea. The fuel pump may not have a relay. If it doesn't draw enough current, it could be switched on and off by something other than a relay. I may simple pump continuously like the electic pump on a diesel. It just pumps constantly and a pressure regulator regulates the pressure on the fuel rail.



    This is something that Harley guards as well as they can. The electronic side of the new bikes. I'm an old school biker and I specialize in the older Panheads, Shovelheads, and Evo powered bike. I'm afraid that I don't know a whole lot about the electronics on the newer model bikes. From what I'm see here and other place, neither do the Harley techs.



    Good luck

    Steve

  • dave6236 Aug 24, 2010

    Thanks Steve, the thing is I'm having trouble with figuring out why my bike turns on for a few secs and then dies out, I replaced the plugs, and a few other thing but I just can't place my finger on why its dying out on me. Before I replace the fuel pump I wanted to check the relay. Once again thanks for you help..

  • wd4ity
    wd4ity Aug 24, 2010

    It sounds to me like it doesn't have any fuel pressure on the fuel line. I agree, I'd want to know the pump was bad before I replaced it as well. That's called mechanicing, not parts replacing. I've also heard that Harley does not have a way to test the fuel pressure ie, a shrader valve in the fuel rail. Is it possible to disconnect the fuel line and install a pressure gauge in the end of it? I don't know this because I don't work on fuel injected bikes. Or, you might could unplug the wires going to the pump and test them for voltage. Surely the pump makes enough noise that if you put your ear to the tank you should be able to hear something. I wished I coudl tell you more.



    Steve

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