After fuel pump change engine stalls - Page 2 - MVAgusta.net
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post #11 of 31 (permalink) Old 06-10-2019, 07:00 AM
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2005 you say? Have you checked your fuel lines? My bike is 2009 and the ethanol ate the lines. You may be getting air in your fuel lines.

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post #12 of 31 (permalink) Old 06-12-2019, 03:08 PM Thread Starter
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I'm wondering if there is a vacuum problem and you're losing pressure ?
Thanks for the help. I checked all of the fuel lines, and they look to be in a pretty good shape (pic in the attachment). Is there any way to test the vacuum? 🤔
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post #13 of 31 (permalink) Old 06-12-2019, 04:06 PM
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I don't know what Tim @cruiser was getting at by talking vacuum.

That line in your hand is under about 3 atmospheres of pressure when the system is up and running. Fuel degrades that material...and I cannot tell if it is an immersible material from the picture.

The line may "look fine" today, burt when it slips off the fuel pump outlet in a week, you will wish you had spent the dime to replace that line...it is a 3 year maintenance item.

I can't tell where you are on this planet, but I have the correct J30R10 spec hose here in my garage for $20/foot plus shipping.

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post #14 of 31 (permalink) Old 06-12-2019, 04:07 PM
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Reading Tim's comment in context, I believe he is wondering if your fuel tank cap is not venting properly and you are drawing a vacuum in your fuel tank.
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post #15 of 31 (permalink) Old 06-12-2019, 06:33 PM
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Originally Posted by silentservice703 View Post
Reading Tim's comment in context, I believe he is wondering if your fuel tank cap is not venting properly and you are drawing a vacuum in your fuel tank.
Thanks Chuck - exactly, I was wondering if there was an actual seal/pressure issue overall.

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post #16 of 31 (permalink) Old 06-12-2019, 06:57 PM
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Fuel tank failure to vent in will not stop the pump from sending fuel to the injectors... the pump will pull a strong enough vacuum in the tank to collapse the metal ones...not sure what happens with the hard plastics.
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post #17 of 31 (permalink) Old 06-13-2019, 02:54 AM Thread Starter
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Guys, thanks for all your inputs. But there I have a question, if there is a vacuum problem, then the pump would run the whole time, as if I understand it right. The pump primes until the preasure is high enough then it stops. Or am I wrong? 🤔

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post #18 of 31 (permalink) Old 06-13-2019, 03:06 AM Thread Starter
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Originally Posted by silentservice703 View Post
I don't know what Tim @cruiser was getting at by talking vacuum.

That line in your hand is under about 3 atmospheres of pressure when the system is up and running. Fuel degrades that material...and I cannot tell if it is an immersible material from the picture.

The line may "look fine" today, burt when it slips off the fuel pump outlet in a week, you will wish you had spent the dime to replace that line...it is a 3 year maintenance item.

I can't tell where you are on this planet, but I have the correct J30R10 spec hose here in my garage for $20/foot plus shipping.
I from Slovenia, a small country in Europe. 😊🇸🇮 I have already order new hoses, just to make sure that also this one are changed after 15 years. I'm also always changing the seals of the fuel pump assembly everytime I open up the fuel tank.

Then ony thing I still want/need to proof is the electrical connection to the pump and the low fuel sensor, to see if there is something wrong with it.

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post #19 of 31 (permalink) Old 06-13-2019, 05:59 AM
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Quote:
Originally Posted by Ziga_SLO View Post
Guys, thanks for all your inputs. But there I have a question, if there is a vacuum problem, then the pump would run the whole time, as if I understand it right. The pump primes until the preasure is high enough then it stops. Or am I wrong? 🤔
The pump primes for three seconds and stops on initial "switch on". Once the bike is running the fuel pump is in continuous run mode and pressure is maintained by a pressure regulator.

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post #20 of 31 (permalink) Old 06-16-2019, 03:57 AM Thread Starter
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Hi guys, a short status update on my Brutale 750S. As I parked the bike after the ride last weekend, I wanted to take it for another ride today. So I turned the ignition key on and the shock was there instantly. The fuel pump didn't prime at all... 😳😢 I turned the ignition off and on again, to give it a couple of tries, but it didn't prime. So my next step would be to completely dissasemble the fuel pump housing, to check the wires that led from the pump, to the connector. But there is a questions that pops out in my head, what could change after I parked it and turned the ignition off, and the bike wan't even moved slightly and after 7 days it doesn't start???

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