BMW K bikes (Bricks)

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SniperX

SniperX
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The bike has 40K miles on it and is running great. I will change all the rest of the fluids I haven't already changed, and was wondering if I should change the fuel pump. How does a fuel pump going bad manifest itself on one of these? 85 K100RT...


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1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

indian036

indian036
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"Running great" is the key phrase. You could change it, but why?

It's not a part that is routinely changed - only if it's giving trouble. 

If you have doubts, remove, clean and replace the pre-screen filter at the bottom of the pump, replace the in-line filter inside the tank if you don't know when it was last replaced. Otherwise, "if it ain't broke . . . "

Bill


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1985 K100RT  VIN 0028991  My original Very Happy   (Historic rego)
1985 K100RT  VIN 0029036  BOB the Blue Old Bike  (Historic rego)
1990 K100LT  VIN 0190452  Work in progress
1984 K100RT  VIN 0023022  Work needing lots of progress

1986 K100RT  VIN 0090542  Work needing lots and lots of progress
1993 K1100LT  VIN 0183046  Work in progress
1993 K75S  VIN 0213045  Newest toy, slightly non-original
    

brickrider

brickrider
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It may well be true that it's not a part that is routinely replaced but, truth to tell, it does have a finite lifespan.  A catastrophic failure on the road can be damned inconvenient.  After market pumps are available for not so much money, so why not change it out if it has some miles/kilometers/years on it?  I did just that, for no other reason than peace of mind. 
My K100RS is running GREAT!  At 40K miles, I'm prepared to believe it's just hitting its stride!  Very Happy


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Brickrider
1985 K100RS; brick red, of course!
    

blaKey

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My pump crapped itself last week on my way home from work.

Symptoms? The bike just stopped. Engine died and I coasted to a stop.

Speedo says 105,000k's.

My 2 cents worth...would be get a spare pump and just have it ready if (when) you need it.


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Neil
K100RS 1986 RED!

Dress for the ride and the potential slide.
    

SniperX

SniperX
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Silver member
I think I'll just replace the filter and clean the screen this weekend (tomorrow) and buy the new pump and keep it in the pannier just in case. I carry enough of the correct tools to swap it out on the road if I get hung up


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1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

Holister

Holister
Life time member
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At 40k its unlikely there'll be anything wrong with the pump but age will deteriorate things like the vibraton damper leaving black bits in your tank which will prematurely clog the filter.


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1989 K100RT     VIN  0097367 (naked)  
1996 K1100RS   VIN  0451808
  Fuel pump question, not sure where to post Austra12    Fuel:  95 Octane
Engine Oil: Nulon Full Synthetic 15W50
Gear Box Oil:  Nulon Synthetic 75W90
    

brickrider

brickrider
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It's been my experience that the in-tank pumps will die without warning. It's happened twice in my old truck and once to my buddy's oil head when we were far from civilization.  When something like this:
http://www.ebay.com/itm/331387290009?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

is so cheap, and can stowed in the little cubby of the K-bikes, it seems like prudent, economical insurance if the installed pump is old.

Changing them out on the road is simple only if you have one to replace it!


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Brickrider
1985 K100RS; brick red, of course!
    

SniperX

SniperX
Silver member
Silver member
The inside of the tank looks brand new. I am unsure if the original owner replaced the pump but will ask if I ever see him again.


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1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

Crazy Frog

Crazy Frog
admin
admin
@brickrider wrote: When something like this:
http://www.ebay.com/itm/331387290009?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT
is so cheap, and can stowed in the little cubby of the K-bikes, it seems like prudent, economical insurance if the installed pump is old.
This is really cheap but ..... an OEM pump push 66PSI and this one is only rated for 43PSI.
It will work, but the pressure of the pump is near the operating pressure for the EFI (36PSI). If this pump lose 15% of its power, it will be near the end of its life.

Still good to have a cheap unit for emergency. Very Happy


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Fuel pump question, not sure where to post Frog15Fuel pump question, not sure where to post Logo2101986 k75, 1985 K100rt, 1985 K100rt/EML GT2 sidecar, 1999 K1200lt/Hannigan Astro Sport sidecar.
    

SniperX

SniperX
Silver member
Silver member
I just decided Ill change it out and keep the one in the tank for a spare. Better piece of mind. I am also going to replace the filter and packing. Is it as easy as it looks to remove and replace everything>?????or are there things / tricks I should know? Anyone done a write up with pics or a video?


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1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

brickrider

brickrider
Life time member
Life time member
It's not difficult at all. But you do need the tools.  Screwdrivers of good quality are essential. You'll need to remove the fuel filler cap without stripping those four screws, and the work inside the tank itself can be a bit puzzling at first.  At least it was for me until I finally discovered that the plastic ring that supports the pump has clips of different sizes.  I tried for the longest time to get it to seat in the support without success before I turned it 180 degrees and it slipped home without more drama. Depending on the replacement pump you select, you may need to change the wiring connectors.  Some use ring connectors on the posts, others use spade-type connectors.
If I recall correctly, YouTube's collection of videos by Chris (?) Harris details the steps to replace the pump.  In any case, it's helpful as a new owner to have a look at his videos - which are numerous - viewing with a critical eye, of course Wink and occasionally trying to ignore his "colorful" language.


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Brickrider
1985 K100RS; brick red, of course!
    

RicK G

RicK G
admin
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I think that 43psi refers to a 3 bar operating pressure. It refers to a PRV at 15-90psi a bit further on.


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"Man sacrifices his health in order to make money.
Then he sacrifices money to recuperate his health.
And then he is so anxious about the future that he does not enjoy the present; the result being that he does not live in the present or the future; he lives as if he is never going to die, and then dies having never really lived."   Dalai Lama


Bikes 2004 K1200GT 1998 K1100 LT, 1993 K75 RT, 1996 K75RT, 1986 K75 GS, 1979 Z1300 Kawasaki
    

Point-Seven-five

Point-Seven-five
Life time member
Life time member
@brickrider wrote:It's been my experience that the in-tank pumps will die without warning. It's happened twice in my old truck and once to my buddy's oil head when we were far from civilization.  When something like this:
http://www.ebay.com/itm/331387290009?_trksid=p2055119.m1438.l2649&ssPageName=STRK%3AMEBIDX%3AIT

is so cheap, and can stowed in the little cubby of the K-bikes, it seems like prudent, economical insurance if the installed pump is old.

Changing them out on the road is simple only if you have one to replace it!
I have carried that same pump everywhere I go since last spring.  I can replace it faster than the Triple A can get to me with their emergency truck.

Only advice is to have a couple of spade terminals and crimpers in the toolkit to make the electrical connections.  The pump is useless without them.  This winter I am thinking of putting the spades on with short pigtails to the ring terminals so changing doesn't require any wiring work.


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Present:
1994 K75RT
1991 K100RS
1988 K100RS SE

Past:
1994 BMW K75S
1992 BMW K100RS
1982 Honda FT500
1979 Honda XR185
1977 Honda XL125
1974 Honda XL125
1972 OSSA Pioneer 250
1968 Kawasaki 175
    

SniperX

SniperX
Silver member
Silver member
Is the stock pump 52mm in diameter?


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1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

charlie99

charlie99
VIP
VIP
yes indeed 52mm is the number

sometimes the length of the pump ...from the retaining ridges that fit in the vibration isolator (rubber ring thing ) can make a difference to when you run out of fuel ... nothing dangerous or suspicious ...just be aware
if your going to store it on the bike ....seal it in a pres seal bag or something to keep out small particulate matter that might lodge in  the roller cell area of the pump ...as they have very close tolerances to operate properly , and any muck can really affect the reliability etc
good luck


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cheezy grin whilst riding, kinda bloke ....oh the joy !!!! ...... ( brick aviator )

'86 K100 RT..#0090401 ..."Gerty" ( Gertrude Von Clickandshift ) --------O%OFuel pump question, not sure where to post Au-log10

'86 k100 rs.. #######..  "Fred " (f(rame) red ) ( Fredrick leichtundschnell ) - -
bits and pieces from many kind friends across the k100 world ...with many thanks ..
    

92KK 84WW Olaf

avatar
Life time member
Life time member
When I had a non running K at the end of November I was suspicious about the fuel pump. Anyway decided now was the time to be having a spare and found an OE brand new old stock for about €40, ring connectors etc. Also got the filter. It was about 2 weeks before I could get time to get at sorting the problem and check fuel pressure etc. Anyway turned out to be the Hall sensor which I replaced.

I am inclined to agree about changing out the fuel pump as a precaution, its one of those components that WILL fail and will fail suddenly. Not if. Away from home is not what you want. Toss the old one behind the workbench as a known good spare.


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1992 K100LT 0193214 Bertha Blue 101,000 miles
1984 K100RT 0022575 Brutus Baja Red 578 bought 36,000 now 89,150 miles
1997 K1100LT 0188024 Wotan Mystic Red 689 58,645 now 106,950 miles Deceased.
1983 K100RS 0011171 Fricka 606 Alaska Blue 29,495 miles Damn K Pox Its a Bat outta Hell Now 37,190 miles. 
1996 K1100LT 0233004 Lohengrin Mystic Red 38,000 miles currently 42,640 miles.

Past:
1968 Yamaha 80 YG1
1971 Yamaha 125 YAS-1
1968 Honda 125 SS
1970 Honda CD 175
1973 Honda CB500-4
Honda CX 500
    

17Back to top Go down   Fuel pump question, not sure where to post Empty Brilliant! Sat Feb 20, 2016 12:22 pm

SniperX

SniperX
Silver member
Silver member
I found one that is rated at the same as stock, same size exactly same look for $85.00 US here so will buy it and swap it in. However I'll keep the stock one since it continues at this point to work perfectly in the pannier in a sealed bag. Cheers all!

Kev


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1985 BMW K100RT, 2006 Ducati ST3, 1996 Honda CBR1000f, 2001 Honda XR400r
    

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