BMW K bikes (Bricks)

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1Back to top Go down   Fuel pump question Empty Fuel pump question on Fri Dec 13, 2013 8:54 am

sidecar paul

sidecar paul
Life time member
Life time member
The later fuel pumps have a breather hose fitted to the filter to, as I understand, prevent cavitation.

This implies that the early pumps may suffer from cavitation.

So my question is:- Will the later filter fit the early pump and, if so, where does the breather hose go to?  

Paul.


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'84 K100RS (0014643) (owned since '85), 86 K100RS (0018891) with Martello sidecar (built as an outfit in '88),
'51 Vincent (since '67),'72 Montesa Cota (from new), '87 Honda RS125R NF4 (bought 2015) 
....No CARS never ever!
    

2Back to top Go down   Fuel pump question Empty Re: Fuel pump question on Fri Dec 13, 2013 9:10 am

duck

duck
Life time member
Life time member
Only the early larger early pumps had that hose.

No, the filter for the later pumps does not fit on the early ones.


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Current stable:
86 Custom K100 (standard fairing, K75 Belly pan, Ceramic chromed engine covers, paralever)
K75 Frankenbrick (Paralever, K11 front end, hybrid ABS, K1100RS fairing, radial tires)
86 K75C Turbo w/ paralever
94 K1100RS
93 K1100LT (x2)
91 K1
93 K75S (K11 front end)
91 K75S (K1 front end)
14 Yamaha WR250R
http://www.ClassicKBikes.com
    

3Back to top Go down   Fuel pump question Empty Re: Fuel pump question on Fri Dec 13, 2013 10:04 am

Inge K.

Inge K.
VIP
VIP
To use the newer type of prefilter with breather you must also change the rubber mount, as the newer
prefilter with breather have a smaller dia than the old one.
Others that have done this change have blinded the breather at the prefilter w/o any problems.


__________________________________________________
Inge K.
K100RS -86. (first owner), K1100LTSE -94.
    

4Back to top Go down   Fuel pump question Empty Re: Fuel pump question on Fri Dec 13, 2013 12:47 pm

japuentes

japuentes
Life time member
Life time member
For what I've seen, the initial pump installation design has a suction strainer which covers all the pump´s lower side, if the strainer gets clogged the pump will run dry, that not only will shutdown the engine due to fuel starvation bu also will destroy the pump due to lack of lubrication and refrigeration, the small hose is intented to guarantee the minium flow required to avoid a catastrophic pump failure, but the engine will shut down.
In the newer design, the pump is settled more deeper in the tank and the strainer do not covers all the pump´s lower face, letting a small hole uncovered, this small hole is the minimum flow suction port that replaces the hose in the initial arrangement.
That´s my best guess.
Best regards
JAP


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Fuel pump question 2854237993 1988 K100RS SE/ABS
    

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