F4 Left me stranded - cranks, starts, dies - MVAgusta.net
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post #1 of 18 (permalink) Old 04-03-2013, 01:58 PM Thread Starter
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F4 Left me stranded - cranks, starts, dies

Hi guys,

My F4 stranded me. I start it and it fires right up, but idles low and dies after a short while. Any throttle kills it immediately.

It did the same thing to me last week, I saw bubbles coming from the hose off the filter, and changed the hoses and filter this weekend. Being that she's got new correct submersible hoses and a new OE filter and that there's no bubbles this time, I'm stumped. The bike was running yesterday, and I can hear the fuel pump prime before start and run when the bike is idling (before it dies).

Seems to me like a fuel pump usually either works or it doesn't. Struggling to figure out what else the problem could be.

What do you think?

If I wanted safe, I'd drive a Volvo. If I wanted cushy, I'd get a Cadillac.

Last edited by Caliautobahn; 04-03-2013 at 03:06 PM.
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post #2 of 18 (permalink) Old 04-03-2013, 05:13 PM
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Wink no fuel?

check the quick disconnects, bet an O-ring/junk is plugging one, probably the pressure side

remove the fuel pump plate, disconnect the John Guest connectors at the fuel rail, reconnect the quick disconnects to the plate, this opens the valves inside, disconnect the fuel filter

blow through the John Guests with an air hose......you will get less air through the return side because of the fuel pressure regulator

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post #3 of 18 (permalink) Old 04-03-2013, 07:02 PM
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At first seems to be a Low fuel pressure problems..... Check the fuel fittings...
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post #4 of 18 (permalink) Old 04-04-2013, 05:14 AM Thread Starter
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Ok, I'll go through the lines. Had her towed home, I'll tear in this weekend. Thanks guys!

If I wanted safe, I'd drive a Volvo. If I wanted cushy, I'd get a Cadillac.
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post #5 of 18 (permalink) Old 04-04-2013, 08:11 PM
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Does the fuel pump prime and then shut off when you turn the key but before you hit the starter, or does it keep running?

I think it is something related to the work you did. Everything is hooked up correctly, right? filter oriented in the correct direction? The vent hoses and over flow hoses connected correctly?
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post #6 of 18 (permalink) Old 04-04-2013, 08:18 PM
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+10

Quote:
Originally Posted by CAG View Post
Does the fuel pump prime and then shut off when you turn the key but before you hit the starter, or does it keep running?

I think it is something related to the work you did. Everything is hooked up correctly, right? filter oriented in the correct direction? The vent hoses and over flow hoses connected correctly?
What he said.

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post #7 of 18 (permalink) Old 04-05-2013, 07:36 AM
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Do you have an alarm? When mine stopped working with similar signals that was the problem. +

http://www.mvagusta.net/forum/showthread.php?t=40327

What a beast of a motorcycle!
It growls and rages and flies across the tarmac like a wild animal that has escaped the confinement of a cage and after merely waiting restlessly until the release, will not endure being locked up ever again.


Skye I miss you. L'essentiel est invisible pour les yeux.
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post #8 of 18 (permalink) Old 04-05-2013, 10:23 PM Thread Starter
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Either you're right that I screwed something up, or I just didn't fix the right problem in the first place. It started and died before I worked on it, and it started and died after. Same symptoms. When it did it the first time, I saw bubbles in the tank and saw that the hose was 3/16ths instead of 5/8ths, so I figured correct, tightened hose and problem solved. Maybe not.

Pump primes and stops. Filter is oriented correctly. Same with vent and overflow. No kinks in the hoses. Pump works, wires have no shorts. All checked and double checked.

This is one of those problems where I need to figure out why it happened just as much as I need to get it fixed. Don't want to put the bike together, have it run, and stall out next week too.

If I wanted safe, I'd drive a Volvo. If I wanted cushy, I'd get a Cadillac.
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post #9 of 18 (permalink) Old 04-05-2013, 10:24 PM Thread Starter
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No alarm either...

If I wanted safe, I'd drive a Volvo. If I wanted cushy, I'd get a Cadillac.
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post #10 of 18 (permalink) Old 04-05-2013, 11:42 PM
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Thumbs down fuel starvation.....

Caliautobahn;
the line between the fuel pump and the injector rail is clogged/blocked or the pump is screwed.....

if it won't take throttle its not getting fuel

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