Fuel pump intermittent fault - MVAgusta.net
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post #1 of 11 (permalink) Old 04-25-2018, 05:35 AM Thread Starter
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Fuel pump intermittent fault

Hi gang

2005 F4, runs well since I synced the bodies, but the fuel pump stops working after about 5 mins of running, not always but sometimes, after a short ride to work or home, then stop it to get through the gate, go to restart & the pump won't prime therefore the bike won't restart, I've swapped the fuel pump relay with the fan relay & the problem is still there

Any thoughts?

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post #2 of 11 (permalink) Old 04-25-2018, 05:50 AM
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Hmmmm.... Either the pump is stopping on a dead armature segment (not likely as it will start again eventually?) or the ECM is not telling it to run (grounding the relay).

Try by-passing the fuel pump relay next time this happens (short across the secondary of the relay, in affect turning the relay on). If the pump runs then the ECM may be the problem.

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post #3 of 11 (permalink) Old 04-25-2018, 06:45 AM
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FUEL PUMP CONTROL SYSTEM
When the ignition switch is switched to the "ON" position, the current from the battery reaches the motor of the
fuel pump via the side stand relay
and the pump relay thereby switching on the motor.
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.

Name:  F4 1000 Fuel Pump Control.jpg
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Name:  F4 1000 2005 Latch Relay.jpg
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Now, all of that being said, there is another possibility: The fuel pump electrical connector is loose or dirty.

It appears that the General Relay and the Latch Relay are of the same construction. The diagram imprinted on the relay will show if that is true. You should be able to swap those relays and see the reaction. Both the Latch Relay and the General Relay play a part in the operation of the fuel pump.

The workshop manual is very confusing about those relays as they are described with changing functions and locations in the manual. Wiring color is the tell.
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post #4 of 11 (permalink) Old 04-25-2018, 06:46 AM
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Don't lose sight of the fact that the pump power runs through the side stand switch.

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post #5 of 11 (permalink) Old 04-25-2018, 03:25 PM Thread Starter
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Originally Posted by silentservice703 View Post
Don't lose sight of the fact that the pump power runs through the side stand switch.
Good to know, a previous owner had bypassed the side stand at some stage

When the pump doesn't run, I can hear the relay operating when the run switch is operated & I have swapped the relay & it still has the same problem, I can hear the relay clicking & the pump isn't priming

Leave it over night & it starts first thing & I'll ride it to work no worries

It's doing my head in, lol
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post #6 of 11 (permalink) Old 04-25-2018, 04:29 PM
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Can you provide a picture of, and/or a location for the relay you replaced?

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post #7 of 11 (permalink) Old 04-25-2018, 04:51 PM
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On your tail section heat shield there should be two identical relays left and right. One is known as the LATCH RELAY (Right Side) and the other is known as the POWER or MAIN RELAY (Left Side).

Both of these relays control functions of the fuel injection system. The POWER or MAIN RELAY controls the fuel pump.

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post #8 of 11 (permalink) Old 04-25-2018, 06:49 PM Thread Starter
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Can you provide a picture of, and/or a location for the relay you replaced?
I switched the relays in the tail, the left relay seams to directly power the fuel pump & the right one controls other things including the fans & starter as when removed the fans run & starter won't start
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post #9 of 11 (permalink) Old 04-26-2018, 05:47 AM
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Quote:
Originally Posted by Codename View Post
I switched the relays in the tail, the left relay seams to directly power the fuel pump & the right one controls other things including the fans & starter as when removed the fans run & starter won't start
Since there are two threads going on this topic, it gets a bit tedious and confusing. I have shown you which relay controls the fuel pump throughout the discussion.

Did you get a new POWER RELAY?

Did that work?

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post #10 of 11 (permalink) Old 04-26-2018, 09:58 PM Thread Starter
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Originally Posted by silentservice703 View Post
Since there are two threads going on this topic, it gets a bit tedious and confusing. I have shown you which relay controls the fuel pump throughout the discussion.

Did you get a new POWER RELAY?

Did that work?
Sorry bout the 2nd thread, just thought I'd start a specific thread that isn't in the introduction section

I haven't gotten a new relay, I simply swapped the relays in the tail & the problem is still happening, I believe by swapping the relays that this has ruled out a relay fault?
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