Fuel pump question - MVAgusta.net
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post #1 of 46 (permalink) Old 06-09-2013, 12:03 PM Thread Starter
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Fuel pump question

Hello,

my f4 750 doens't go any further than 11.000 revs.
At the moment I'm thinking about a problem with the fuel pump
To confirm this I have to know what the function of the small hole is which you can see in the picture:


The pump spills out a lot of fuel from that hole while idling which makes it drop pressure. My feeling says it ain't right but I can't find the exact purpose of the hole.

Hopefully someone can help me out!
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post #2 of 46 (permalink) Old 06-09-2013, 12:16 PM
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I think it gift have something to do with an internal valve that stops fuel from draining back out the feed when the pump is stopped, but I don't know how it works. I did a lot of diagnostics on my 750 recently and don't recall seeing any flow from that hole when it idled.

Si
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post #3 of 46 (permalink) Old 06-09-2013, 06:01 PM
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Thumbs down 11k only?

all Bosch pumps have that and work....

'T' an pressure gauge into the fuel line, you should see 3 bar 43.5 psi
if you don't;
when was your fuel filter changed last?
then check the fuel pressure regulator

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post #4 of 46 (permalink) Old 06-09-2013, 06:04 PM
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That hole is to bleed off Fuel to keep and hold a set PSI of fuel to the motor. Found this bit of info from my Mitsu EVO8 Days.
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post #5 of 46 (permalink) Old 06-09-2013, 11:47 PM
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Wink wtf?

Quote:
Originally Posted by Anarchy99 View Post
That hole is to bleed off Fuel to keep and hold a set PSI of fuel to the motor. Found this bit of info from my Mitsu EVO8 Days.
really?

so what does the Weber fuel pressure regulator in the fuel pump plate do????


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post #6 of 46 (permalink) Old 06-10-2013, 06:21 AM
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Quote:
Originally Posted by theknurl View Post
really?

so what does the Weber fuel pressure regulator in the fuel pump plate do????

Pump PSI and Inj. PSI are not the same The pump is set at one psi and that hole Reg. it so it dose not ever go over the red zone and over pressure the fuil lines. and the Weber Reg oversees that the Injectors get less of what the pump puts out and is at that psi at all times. And the pump psi will go up and down many times but the Injectors need a set pressure to supply fuel to the motor.
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post #7 of 46 (permalink) Old 06-10-2013, 07:32 AM Thread Starter
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Hm if it is supposed to be like that I've got an other problem. But I got no clue what
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post #8 of 46 (permalink) Old 06-10-2013, 08:11 AM
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I would look at Coils, Plugs,all ground wires.
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post #9 of 46 (permalink) Old 06-10-2013, 08:13 AM Thread Starter
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Quote:
Originally Posted by Anarchy99 View Post
I would look at Coils, Plugs,all ground wires.
Hm weird thing is that I've recently replaced all the spark plugs and a new injector. After that it ran a lot better up to a few days ago.
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post #10 of 46 (permalink) Old 06-10-2013, 08:33 AM
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Have you taken a look at the filter also?
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