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Old 01-27-2008, 08:21 PM   #1 (permalink)
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Can you bump start a fuel injected harley with a dead battery?

If your battery is dead will it bump start or does the fuel pump and computor need juice first
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Old 01-27-2008, 08:27 PM   #2 (permalink)
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Quote:
Originally Posted by pacaver View Post
If your battery is dead will it bump start or does the fuel pump and computor need juice first
I am pretty certain that the system needs power first because all the sensors have to "tell" the ECM when to fire the plugs.

I have witnessed about six large fellows attempt push starting a bike that was FI and nothing happened. They were done after the 10th try.

A great test would be to place a dead battery in a bike and try to coast start it down a good slope.

Has anyone else tried this?
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Old 01-27-2008, 08:31 PM   #3 (permalink)
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It won't start if the battery is totally dead.
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Old 01-27-2008, 08:35 PM   #4 (permalink)
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That is what I was thinking too.

I miss the days of kickers. Man, many times have I had a bike's battery go south with no warning and the kick start save the day. But those were bikes that were carbs, coils, points, and that's about it. There were not any ECMs telling anything. It was a simple and sometimes frustrating system that had this one life saving feature.
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Old 01-27-2008, 08:36 PM   #5 (permalink)
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I have personally bump started an 07 dyna, although the battery was not completely dead, there just wasnt enough juice to turn it over. I had to do it in third gear however.
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Old 01-27-2008, 08:52 PM   #6 (permalink)
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The biggest thing is that you need sufficient power to run the fuel pump.
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Old 01-27-2008, 09:30 PM   #7 (permalink)
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Even if you manage to jump start it you won't get far with a dead battery. Change out your battery every 2-3 years and you shouldn't have any problems.

Cheers,
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Old 01-27-2008, 10:09 PM   #8 (permalink)
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Quote:
Originally Posted by cj21tol View Post
I have personally bump started an 07 dyna, although the battery was not completely dead, there just wasnt enough juice to turn it over. I had to do it in third gear however.
Same with me...the bike wouldn't turn over, but a couple guys shoved me, and she started (I used 2nd gear).

I changed the battery that same day.
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Old 01-27-2008, 10:16 PM   #9 (permalink)
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Mine was dead enough to not crank it to start. Bump start, kicked right over, check engine lamp and charging lamp came on. Took to dealer and they put in a new regulator under warranty. Don't know why this would have happened though.

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Old 01-28-2008, 07:23 AM   #10 (permalink)
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You cant "bump" start a FI system if the battery is TOTALLY dead..0 volts as would happen if you left something on or had a short.But you can bump start a very low battery.You just have to have a little in the battery to power the ECM and pump as mentioned.
And just a reminder to guys with older tourers..check to see if your regulator plug has been moved to the updated position.This mainly applies to the early
TC88's that had the plug mounted low and it filled with water that wicked into the stator and shorted it out giving you a intermitent no charge untill it finally totally burns out.Newer tourers were all updated from the factory.

Just my 2 cents worth
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Old 01-28-2008, 02:15 PM   #11 (permalink)
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Quote:
Originally Posted by road_king View Post
The biggest thing is that you need sufficient power to run the fuel pump.
That's the main point. No fuel pump at the initial point will probably prevent it from starting. You need to have a signal that the pressure is up before the machine will start. I'll go a bit farther to say that it's probably not a good idea to do anything wih a bike that has a TOTALLY dead battery. Good solid voltage is the best for your system.

My 2 cents.
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Old 01-30-2008, 05:59 AM   #12 (permalink)
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I was told at the Moco that EFI needs at least 9 volts at the battery for the motor to run.Of course without a voltmeter you would never know that.
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Old 01-30-2008, 06:42 AM   #13 (permalink)
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Quote:
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I was told at the Moco that EFI needs at least 9 volts at the battery for the motor to run.Of course without a voltmeter you would never know that.
That sounds about right. I know when my voltmeter on the fairing gets down to about 9 the fuel pump sounds sloooooow and it may or may not crank.
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Old 01-30-2008, 07:54 AM   #14 (permalink)
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Quote:
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Took to dealer and they put in a new regulator under warranty. Don't know why this would have happened though.
Chris
If the regulator fails, it won't charge the battery, so the battery will die.
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Old 01-30-2008, 04:10 PM   #15 (permalink)
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That's why I always carry a small set of jumper cables in my coat. I could carry them in my saddlebag but none of my other bikkes have saddle bags. Just small tool pouches. And sure as sh*t I'd need em and they'd be on the land yacht! Man those things have saved many of my friends over the years. Just some 12 guage wire with alligator clips.
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