After fuel pump change engine stalls - MVAgusta.net
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post #1 of 31 (permalink) Old 06-08-2019, 10:25 AM Thread Starter
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After fuel pump change engine stalls

I have had a faulty fuel pump, the old bosch fuel pump didm't prime anymore. So I ordered an aftermarket fuel pump, changed it together with the fuel filter. Now the fuel pump primes, the bike starts, but as I wanted to take it for a ride, after I turned the throttle to the 3-4k RPM (I let the bike heat up on idle), the engine stalled. Then after I turned the ignition on and off it started again, but as soon as I get on throttle, the bike stalls. I assume, that the bike doesn't get enough fuel, as it stals when I turn the throttle up.

Bike is stock, has a corse eeprom (from Adam) and a hp corse exhaust (no cat). It's european standard 95 gasoline, that has been working now for last 6 years without any problems.

Do you have any, Ideas what I can check on the bike? Could it be the new pump?

Thanks for your help in advance.

BR,

Ziga

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post #2 of 31 (permalink) Old 06-08-2019, 11:12 AM
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It would be very nice to know what “the bike” is. That being said, you probably have a pinched or restricted lie to your fuel rail. Those lines are very sensitive to position under the tank...or you fuel connector isn’t completely made up.
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post #3 of 31 (permalink) Old 06-08-2019, 12:04 PM Thread Starter
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Sorry for the lack of informations. I have a Brutale 750S, 2005. I will check the hoses and give you a feedback. Thank you for your help.

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post #4 of 31 (permalink) Old 06-08-2019, 12:12 PM
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Or your new pump/filter cannot move enough fuel...... I will assume the filter is OEM and not the problem...what kind of pump?

That said, I think SS703 is on the right track.

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post #5 of 31 (permalink) Old 06-08-2019, 01:41 PM Thread Starter
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Pump has the specs in thw attachment. Fuel filter is OEM, so I will look into the hosing, but ai have replaced them 3 years ago and it worked flawlessly.
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post #6 of 31 (permalink) Old 06-08-2019, 01:56 PM
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That pump should be fine.

I'd check supply lines from the pump plate to the injector rail.
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post #7 of 31 (permalink) Old 06-09-2019, 10:31 AM Thread Starter
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Hi guys, just to give you a short feedback. I dissattached the complete fuel tank and attached everything back on and the bike started and run flawlessly. Even in the revs, so I took it for a test run, and whe I was driving back home, at the last intersection it stalled/lost power again, after I changed from 1 to 2 gear on about 6-7k rpms. I stopped at a side of the road, wanted to start it again, but it didn't restart. So I turned the ignition off and back on, the pump primed and engine started again... My only option for the solution would be checking the electrical situation on the bottom of the fuel pump. Or am I wrong? Did anyone had the same issues?

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post #8 of 31 (permalink) Old 06-09-2019, 10:46 AM
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Well... since the problem only began after you removed and reinstalled the tank (the first time) I am going to say it has something to do with what you touched...

By the way...what model bike is it ??

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post #9 of 31 (permalink) Old 06-09-2019, 10:54 AM Thread Starter
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Quote:
Originally Posted by esq'z me View Post
Well... since the problem only began after you removed and reinstalled the tank (the first time) I am going to say it has something to do with what you touched...

By the way...what model bike is it ??
The problem was even biger before, because the bike didn't even rev up, and stalled. So I reinstalled everything once again, to double checked it, but I can't say that this solved the problem, as the problem repeated... It is the Brutale 750S, 2005, with 26k km behind it.

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post #10 of 31 (permalink) Old 06-10-2019, 04:49 AM
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I'm wondering if there is a vacuum problem and you're losing pressure ?

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