K11 Owners Group

Luke's Buddy · Joined: 17 Nov 2012 Posts: 24 Location: Phoenix, Arizona

While replacing a damaged fuel cap on my 1996 K1100RS, I noticed a few bad things going on in the fuel tank.
1. The fuel pump is loose, and rattles around it it's housing.
2. All the fasteners are rusty.
3. The hose between the fuel pump and the fuel filter is crumbling.
4. There are brown particles in the lower corners of the fuel tank, likely bits of hose rubber an rust from the fasteners.
5. The fuel level sender has a float that looks too small to do much. The whole thing may be bent. It does work, but I don't know how accurate it is.
6. The low level light does not test when turning on the key. Should it?

I'll certainly need to replace the fuel pump and fuel filter, as well as the fuel lines. I've been told that there is an available automotive replacement that works. How about the fuel filter? Where do I get these items?

Thank you for any assistance!
John in Phoenix
(Luke's Buddy.)
_________________
Luke's Buddy
1996 K1100RS

SugarHillCTD · Posted: Wed Apr 16, 2014 6:17 am Post subject:

John,

Is the fuel pump not working? If it is working, the donut that it fit in is available separately from BMW dealers (#4 in the picture- that is from the MaxBMW website). Cheaper than replacing with an aftermarket pump.

These folk are your friends for parts.....

http://www.beemerboneyard.com/

Fuel filters, oil filters, misc. tools, etc

The fuel gauge is fairly inaccurate on these bikes- Having ridden bikes since the 70's, I always rely on the trip odometer for fuel level.

When you replace the fuel lines, be sure to use hose that is good for fuel injection.
_________________
John & Cathy

'92 K100RS4V Pearl White SOLD
'04 K1200GT
IBA Several-SS1k, BBG, 50CC NYC to S.F.

Inge K. · Posted: Wed Apr 16, 2014 6:33 am Post subject:

Scott_Anderson · Posted: Wed Apr 16, 2014 7:46 am Post subject:

A decent generic fuel filter is a NAPA gold 3032 for less than $5.
Metal housing and rated for FI pressures.
_________________
Ride safe.

1995 K1100LT 0302044
2017 FLHTK Ultra Limited
Garmin StreetPilot 2820
Garmin Zumo 550
Garmin Zumo XT
"One who does not ask questions is ashamed to learn" Danish proverb
1997 K1100LT 0302488(R.I.P.)
1997 R1100RT ZC62149(sold)

whyoldbill · Posted: Wed Apr 16, 2014 9:02 am Post subject: Re: Fuel pump replacement??

Mobtown · Joined: 06 May 2014 Posts: 7 Location: Bawlmer, Merrylane

I have a 1994 K1100RS which has always started immediately no matter how long it sat. After a long winter, I tried to start it yesterday and it would not start. Cranked fine and tried to kick over on several occasions but nothing. Gas smelled bad so I drained and replaced. The fuel pump kicks on as designed but no gas is coming out of the line going to the fuel rail. Is it possible that the fuel could have clogged the $400 fuel pump? Can it be salvaged?

Flying Duck · Posted: Tue May 06, 2014 9:24 pm Post subject:

If some crud has jammed it then sometimes reversing the polarity so it spins the other way and kicks out what's jamming it will help.

Never hurts to spend $4 on a new 3032 fuel filter from NAPA.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Mobtown · Joined: 06 May 2014 Posts: 7 Location: Bawlmer, Merrylane

Sorry forgot to mention that I already replaced the $35.00 BMW fuel filter. Good to know about the 3032.
Thanks

Flying Duck · Posted: Tue May 06, 2014 9:45 pm Post subject:

Try pulling the plugs to see what they look like.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Mobtown · Joined: 06 May 2014 Posts: 7 Location: Bawlmer, Merrylane

Thanks but regardless shouldn't I have gas flowing out of the tube coming out of the gas tank going to the fuel rail when cranking the bike if the fuel pump is working?
Question

_________________
1994 K1100RS

Life is too short to drink bad beer!

Mobtown · Joined: 06 May 2014 Posts: 7 Location: Bawlmer, Merrylane

BTW This bike has been bulletproof for over 60,000 miles and I love this bike. Grew up on Harleys, graduated to Ducs and evolved to Beemers.
_________________
1994 K1100RS

Life is too short to drink bad beer!

Flying Duck · Posted: Tue May 06, 2014 10:02 pm Post subject:

What does "kicks on as designed" mean?
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Mobtown · Joined: 06 May 2014 Posts: 7 Location: Bawlmer, Merrylane

It means that when you push the start button the fuel pump runs for a few seconds then shuts off when the bike does not start. By runs, I mean that it makes the sound as though it is running because no fuel is coming out of the fuel line.
_________________
1994 K1100RS

Life is too short to drink bad beer!

Flying Duck · Posted: Wed May 07, 2014 9:13 am Post subject:

Hmmm... got me. I've played with lots of K fuel pumps and in my experience if they're whirring then they're pumping fuel and generating fuel pressure.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Mobtown · Joined: 06 May 2014 Posts: 7 Location: Bawlmer, Merrylane

If I pull off the fuel filter, fuel flows freely from the fuel line. I have had previous experiences with fuel gumming up a carburetor but never a fuel pump. I actually did have Stabil fuel stabilizer in the fuel but it was an extended period of sitting this winter so maybe it still turned. I will reverse the connections to see if it pumps backwards.
_________________
1994 K1100RS

Life is too short to drink bad beer!

Flying Duck · Posted: Wed May 07, 2014 2:25 pm Post subject:

FYI: The yellow(ish) wire is 12V+ and goes to the smaller diameter threaded terminal on the FP. The ring terminals for the FP connections are different diameters so it's hard to get that wrong.
_________________
93 LT (x2)
94 RS
86-97 K75F(K75/100/1100 Frankenbrick)
86 K75C w/paralever, hi perf cams,TURBO!
91 & 92 K75Ss
91 K1
86 custom K100
14 WR250R
IBA #17739 (SS1K, BBG, 50CC)
Buy parts HERE

Mobtown · Joined: 06 May 2014 Posts: 7 Location: Bawlmer, Merrylane

I would like to thank everyone for their help in this matter. This was my first time reaching out on the forum and I am extremely pleased with the help I received.
As a follow up, I realized that if fuel was flowing out of the fuel line when the filter was disconnected it must be a problem with the fuel pump. I removed the pump and tested in a bucket and low and behold it was not pumping. After I saw how much the pumps cost, I took the pump and filled it with Gumout carb and choke cleaner and let it sit for a few hours while I cut the grass. When I got back to it, I shook out the carb cleaner, placed it back into the bucket to test and when hooked up to the battery it shot water everywhere. Voila like brand new! Lesson learned, if it seems obvious it probably is. Thanks again to all who chimed in. Very Happy

_________________
1994 K1100RS

Life is too short to drink bad beer!