BMW K bikes (Bricks)

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1Back to top Go down   fuel pressure valve Empty fuel pressure valve Tue Jun 29, 2010 6:28 pm

Rob Roy Mcgregor

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Silver member
Silver member
hi does any one know if you can hear the diaphram moveing when you suck on the vacume pipe . . fuel pressure valve Icon_question
i hear nothing. . could this be a problem ,thanks .

    

2Back to top Go down   fuel pressure valve Empty Re: fuel pressure valve Tue Jun 29, 2010 7:59 pm

Ned

Ned
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No, I don't remember it being noisy. In principle the diaphragm doesn't move it simply flexes to reduce/increase the pressure of the ball valve on the seat. This regulates the pressure.

Good things:
a. no noise
b. holds vacuum when you suck on it.
c. pressure fluctuates according to vacuum "load"
d. holds fuel pressure at 36psi and increases to 42? as you apply vacuum.

Things to look for:
a. fuel pressure drops immediately the fuel pump stops. The system should hold the pressure for at least few minutes.
b. fuel leaks internally through the vacuum tube when you suck on it.
c. the fuel pressure must be 36 psi with no vacuum applied.



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Ned

05/1986 (K55) K100RS Motorsport (Europe), Production Code: 0503, 110k km, VIN:0140519 (SOLD)
1976 Honda Goldwing GL1000 (naked)
1997 BMW K1200RS red, VIN: WB10544A1VZA22667
    

3Back to top Go down   fuel pressure valve Empty Re: fuel pressure valve Wed Jun 30, 2010 10:45 am

Rob Roy Mcgregor

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Thanks again ned . . have yourself a V.B.

    

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