Replaced SPU Started once, won't start again? - MVAgusta.net
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post #1 of 19 (permalink) Old 09-17-2011, 06:47 PM Thread Starter
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Replaced SPU Started once, won't start again?

Hey all,
Hope you can assist I replaced the SPU started it once, it ran perfectly. Turned it off when I went to start it again the battery was flat, replaced the battery with a new one. Still won't start.

The symptoms:

When the Ignition is turned on the sound it used to make has changed.
When it was turning over it back fired a few times
Can smell the fuel

Any ideas what this might be?
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post #2 of 19 (permalink) Old 09-17-2011, 07:20 PM
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does the fuel pump make a squeal instead of a hum? But I don`t think you would smell gas though if the pump failed. the fuel goes out the bypass instead of through the pressure regulator and to the rail.

B750 and B1078 RR both gone now.

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post #3 of 19 (permalink) Old 09-17-2011, 07:52 PM
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Wink fuel routing?

cdamb;
doesn't matter how you hook the fuel lines up.......
it comes out of the pump, goes through the fuel rail and THEN to the fuel pressure regulator

it going to go clockwise or counter clockwise.....pressure is the same........don't tell MV with their color coded connectors

kind of shows what they know about fuel injection......why isn't the vacuum operated pressure regulator connected to manifold pressure?
it would equalize the spray pattern




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post #4 of 19 (permalink) Old 09-17-2011, 07:55 PM Thread Starter
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The sound it now makes is hard to explain, it just sounds sick would be the best way to describe it.
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post #5 of 19 (permalink) Old 09-17-2011, 08:02 PM
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If the bike turns over and doesn't catch, and everything else seems fine, I would suspect the fuel pump or fuel filter. As long as you don't see fuel your hoses aren't leaking, but smelling fuel is not right either.
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post #6 of 19 (permalink) Old 09-17-2011, 08:40 PM
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Post Tank Fuel Lines

Take your tank off, I will put money on it being a damaged fuel line, inside the tank.
PS. Why did you replace the SPU ?

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post #7 of 19 (permalink) Old 09-17-2011, 09:09 PM Thread Starter
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I replaced the SPU as the last one was faulty, common fault with the origainal SPU.

Have checked the cables, no leaks.

I am tempted to switch the fuel Cables over to see if that makes a difference.

Don't understand why it started fine then after the battery failure it wont start.
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post #8 of 19 (permalink) Old 09-17-2011, 09:29 PM
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Quote:
Originally Posted by Ridealot View Post
I replaced the SPU as the last one was faulty, common fault with the origainal SPU.

Have checked the cables, no leaks.

I am tempted to switch the fuel Cables over to see if that makes a difference.

Those are called Fuel lines, the cables are a completely different thing. Swapping them over wont make a difference mate.

Don't understand why it started fine then after the battery failure it wont start.
The fuel lines I am talking about is inside your fuel tank mate. Open your fuel cap and turn the bike on, see if you see bubbles inside the tank as you turn the bike on.

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post #9 of 19 (permalink) Old 09-17-2011, 09:30 PM Thread Starter
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Donsy I think you might be right as far as the Fuel line, There is no damage however I think the way the fuel lines are sitting when the tank goes in it could be crimping one or both of the fuel lines.
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post #10 of 19 (permalink) Old 09-17-2011, 09:31 PM Thread Starter
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Will try and start the bike without the Tank being seated in the Bike to confirm my theory.
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