Fuel pump won't shut off if bike not started. - MVAgusta.net
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post #1 of 6 (permalink) Old 02-10-2019, 07:49 PM Thread Starter
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Fuel pump won't shut off if bike not started.

I have a 2000 F4s. been laid up for 2 years prior to me purchasing it.
Took full system apart and replaced all the hoses and checked the fuel pump and replaced filter.
Put in a new battery and turned the ignition on.
Pump primed but stayed running. Should shut off after 3 seconds.
Checked side stand switch and both relays. All work fine. Replaced Start switch with new one from and F4. Not that.
I sent the ECU to Carmo to check nd it came back with a clean bill of health.
Stumped. Anyone come across this before?
I also know of a local f4 with the same issue.
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post #2 of 6 (permalink) Old 02-10-2019, 11:02 PM
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Couple of relays to check. You may have a sticking fuel pump relay. (contacts welding).
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post #3 of 6 (permalink) Old 02-11-2019, 06:57 AM
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Two things: First verify the polarity of the "new battery" installation. The negative pole should be forward on the bike under the fuel tank support. (Yes, people install batteries often in reverse polarity.)

Second, swap the two relays that are left and right on the undertail heat shield. They are identical relays but perform different functions...one of them control the fuel system.

Now, do you have your shop manuals from here: Team Double 3 Racing | MV Agusta

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post #4 of 6 (permalink) Old 02-14-2019, 09:34 PM Thread Starter
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I have the manuals and will double check the relays.
Thanks.
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post #5 of 6 (permalink) Old 02-18-2019, 11:30 AM
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Excerpt below from the manual


FUEL PUMP CONTROL SYSTEM
When the ignition switch is turned to the ON position, the fuel pump motor is started by the current supplied by
the battery through the sidestand switch and the pump relay (or through the neutral indicator and the safety
switch).
As the CPU possesses a timer function, the pump motor stops turning three seconds after the ignition switch has
been brought to the "ON" position. If the starter motor turns the electric motor shaft during or after the three seconds,
the motor rotation signal is sent to the CPU that, by controlling the pump relay, makes the pump motor function
continuously. When the ignition switch is switched to the "OFF" position, the control of the pump relay is interrupted
and contemporaneously also the control of the injectors and the ignition coils, thereby causing the engine
to switch off.
-

Last edited by gotojoe; 02-18-2019 at 12:25 PM.
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post #6 of 6 (permalink) Old 02-18-2019, 01:42 PM
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Everything that is starting and off after a bit time is commanded by a relay.
So your problem is a dead pump relay, or circuit of relay
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