Question about 1984 BMW K 100 RT

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Universal fuel pump versus genuine fuel pump for BMW K100RT

I have a BMW K100RT and it had been sitting in my garage for 6 years with 1/2 a tank of fuel. I found that the petrol had gone stale, it has crystallised in the tank. I have cleaned the tank right out, but I’m troubled about the fuel pump. The bike had done160,000k’s and maybe I should buy a new fuel pump, but the cost for an original bosch fuel pump is around $500AU, there is a Bosch part # 0986580013 universal fuel pump that I may use instead of original and the cost of it is only $86au
the ad for the Bosch # 0986580013 fuel pump reads as follows
BRAND NEW high performance Bosch 51mm INTANK fuel pump.
This is an universal fuel pump - suits any INTANK application.
Genuine Bosch. Made in Czech Republic. In original Bosch packaging and documentation.
*** Sorry we don't have any performance data on this fuel pump, other than the fact that this is a 51mm INTANK fuel pump. Perhaps do a bit of homework yourself to decide if this pump is the right choice for your vehicle. ***
I’m having a problem finding any specifications on the abovementioned fuel pump. Can anyone help me to know whether this pump would be okay to use on my BMW K100 bike. The original BMW K100 specifies the fuel pump pressure 2.5 bar and output 45 litres per hour, is it possible to go higher in pressure and flow?

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  • SAPWanderer Apr 25, 2010

    Hi GVMG,

    Did the cheaper fuel pump work okay? I have a K100RT and the fuel pump has failed so l need to replace my pump. I am curious if the alternative pump worked and where you purchased it from

    Thanks

    Philip

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Without changing out your fuelline I would not reccomend to go for a higher pressure and flow.
About the fuelpump....sometimes going for the cheap option is in the longrun more expensive.

Posted on Mar 02, 2009

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I have a 1983 gr650 tempter. The engines runs great sitting still. Hits rpms and sounds good. My problem is when I put it into gear, it spits and sputters and wont hit rpms. I'm lost.


Obviously something is wrong. Start simple check all routine maintenance items, empty the gas & save a sample from the bottom of the tank. Why? Ethanol/gas loves to absorb water from the air in as little as 1 month. Additives allow the water to mix with the fuel, it does not prevent it and it needs agitation to mix. So if your bike sits in a garage for 6 months waiting for good weather, you can expect to be running watered down fuel. It will sound like those lawn mowers that sputter and spit in the spring after sitting all winter. If you find water, even 1 drop, clean everything out: tank, fuel lines, fuel pump(if applicable), carb, and carb bowl if applicable. If all is well, do a compression test.

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Hi, Anonymous I just loaned my brand new pair of listening ears to your local dealers chief technician so he could take your bike for a test ride and give you his professional opinion and estimate about your noise and repair cost. For more information about your issue, please visit the websites below. Good luck and have nice a day.
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Low fuel light came on, i found a garage put a tenners worth in' everything fine for 3 mile then when i rode it up a steep hill halfway up it died on me it would not restart.when i pushed to level


Hi, Gordon the following applies to carbureted also fuel injected models and the usual suspects are:
1. Severely discharged or damaged battery, 9 volts or lower.
2. Failed alternator/generator and or voltage regulator.
3. Loose or corroded battery terminals and or cables especially the "NEGATIVE" cable, look for loose, corroded, or broken connectors inside the cable harness at "BOTH" ends.
4. Failed main circuit breaker or ignition switch, check for loose connections and continuity.
5. Failed system and or ignition relay, check for continuity.
6. Failed ignition coil, ignition/electronic module.
7. Failed CKP, CPS, CMP, MAP, TPS, or BAS sensor, corroded, loose or broken wire connector pins/sockets.
8. Throttle cables and or idle speed improperly adjusted hot idle speed should be 950 RPM to 1000 RPM.
9. Air/fuel mixture screw improperly adjusted.
10. Water or dirt in the fuel system, carburetor or filter.
11. Restricted, blocked or kinked fuel line.
12. Fuel tank empty.
13. Gas cap is not venting properly or fuel tank venting system blocked.
14. A failed fuel pump, pressure regulator and or fuel injectors.
15. Vacuum line from intake manifold to petcock broken, cracked, or not attached, carburetor vent line plugged.
16. Needle and seat stuck closed in the float bowl.
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Hi, Tonyhickey52 if your bike has been sitting idle for months or years and you did not do any pre-storage maintenance I feel your pain it will probably have a dead battery and not want to start or if it starts it will idle and run poorly, here are the following steps necessary to complete in order to get your bike back to an acceptable running condition.
1. If your battery was 3 years or older when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or better, any readings in the 11 volt range you need to do a proper load test on the battery and replace as necessary, any readings in the 10 volt range you have a dead cell and replace the battery.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove your air cleaner and clean and re-oil per Mfg. specifications.
6. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
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I have a k 100 rt, its been stood for 10 months, have charged the battery, the engin e spins but will not fire ?????


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1. If your battery was 3 years or older when you last had the bike running you should replace it.
2. If you believe your battery might still be serviceable remove it from the bike and put it on a 1 or 2 amp trickle charger for 24 hours. If it is the old lead acid type with visible cells and acid levels fill each cell to the top line with distilled water and replace the caps, run the vent tube into a plastic or styrofoam cup, any cells that are cloudy/milky replace the battery.
3. After charging remove the leads and let the battery sit for a couple of hours then check the battery voltage with a volt meter, you should have 12.5 volts or better, any readings in the 11 volt range you need to do a proper load test on the battery and replace as necessary, any readings in the 10 volt range you have a dead cell and replace the battery.
4. Drain and flush fuel tank, google " how to clean a motorcycle gas tank" find a couple forums to view the different options available.
5. Remove your air cleaner and clean and re-oil per Mfg. specifications.
6. Remove the carburetor, disassemble and decontaminate with a carb dip or if you have EFI remove injectors and clean with carb spray and compressed air
7. Remove fuel valve and filter disassemble and clean as necessary, remove fuel lines and replace with new ones.
8. Replace spark plug with a new one and check for spark.
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Hi, I have a 1988 BMW K100RT. It's been sitting in the shed unstarted for 12 months. Today I dumped the old fuel and put half a tank of fresh fuel in, installed a brand new battery, oil filter and engine...


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i have a 1985 k100rt and it would not start. i made some calls to bobs bmw in maryland and i unplugged electrical connector on gas tank ,sprayed it with electrical contact cleaner and coated it with dielectric gel. that fixed it. also check main grounding point on frame under gas tank.on a bike this old you need to make sure electrical connections are clean. the fuel pump is supposed to deliver fuel at 36 psi according to clymers repair manual. i hope this helped .

Nov 20, 2008 | 1988 BMW K 100 RT

1 Answer

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i have a 1985 k100rt and it would not start. i made some calls to bobs bmw in maryland and i unplugged electrical connector on gas tank ,sprayed it with electrical contact cleaner and coated it with dielectric gel. that fixed it. also check main grounding point on frame under gas tank.on a bike this old you need to make sure electrical connections are clean. the fuel pump is supposed to deliver fuel at 36 psi according to clymers repair manual. i hope this helped .

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