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





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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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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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May 20, 2013 | 1989 BMW K 100 RT

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My truck has been sitting in a garage for 7 years and want stay running

The very first thing you do is get rid of the gas in the tank. When petrol sits for a year or more, varnish develops in the tank and lines. Once you do that, add a fuel additive for cleaning out a varnished fuel system. Ask your local Auto Zone or whomever you go to, I would then check that you have fuel pressure to the fuel system by removing a line and having someone crank it for you. If no fuel pressure, the fuel pump has been glued by varnish. If you do have fuel pressure, then you should check the distibutor cap on the inside to free any corrosion on the contacts. Make sure the spark plugs are good, and if not change them. Hope this helps.

May 02, 2012 | 1991 Toyota Pickup

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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 ?????

Hi, Jason 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
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.
For more information about your issue please visit the websites below. Good luck and have a nice day. What to do When Your Motorcycle Won Start
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Apr 28, 2011 | 1996 BMW K 1100 LT

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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...

Removing all the old fuel is a good start, the tank is only one point, you also need to flush the old fuel out of the total system including the fuel rail and pipes, to ensure fresh fuel is first into the engine.

Nov 06, 2010 | 1988 BMW K 100

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Bmw X5 2001 3.0i. 4th year in a row about the same time each year vehicle can not remain running for more than a few seconds. Always have to have it towed in always runs for about another year. Have...

I had the same issue (replaced fuses, fuel pump, pump relays fuel lines, selaers and gaskets and so on). Finally, I had fuel guage sending unit replaced (the thingy that measure the fuel in the tanks) in both the main and reservoir tanks-and no more problems.

Jun 18, 2010 | 2001 BMW 5 Series

1 Answer

BMW 525i will not start

There are six fuse panels for an E39 BMW
Fuses F1 - F45, fuse panel 1, glove compartment. Twist white plastic retainers 90 degrees and pull down from top of glove compartment.
Fuse 31 (10 amp) protects fuel pump relay(K96)

Fuses F46 - F6, fuse panel 2, trunk located behind right side luggage compartment interior panel.
Fuse 54 (15 amp) protects fuel pump relay(K96)

Before I would do any of the following, I would check the above fuses and put a bottle of HEET into the fuel tank. Fuel filter changing is not hard, but it will take you about an hour.
The fuel pump is another story (BMW has a special spanner wrench(16 1 020) to remove and install the threaded collar.

E39 BMW use a two-lobed fuel tank(think saddle bag like). Each with its own fuel level sending unit that has a float connected to a variable resistance wiper contact. To equalize fuel level between the two tank lobes, a siphon pump is installed in the left lobe. The resistances need to be approximately the same. The fuel pump is on the right lobe under the tank sending unit beneath the threaded collar at the top of the fuel tank which is accessed by removing the rear seat cushion. WARNING When removing the fuel level sender or the fuel pump, the fuel tank should be drained to 1/4 capacity or below. The fuel in the fuel line is under pressure (45-75 psi). Always unscrew the fuel tank cap to release pressure in the tank before working on the tank or lines. Disconnect battery negative cable.

The fuel filter is located beneath the center of the car near the driver's seat usually under a protective metal cover held on by small screws. Not hard to replace but car will need to be on jack stands and 1/4 tank or less of fuel in the tank. Definitely wear safety goggles or face shield as the fuel will come out on face. Have a fuel catch pan under the filter. Clamp the fuel line before and after the fuel filter(long metal cylinder) before loosening hose clamps. Loosen center clamping bracket and hose clamps on either end of filter. [Some have an inline fuel pressure regulator.(Remove vacuum hose, pull out locking clip, remove fuel pressure regulator).]
Drain fuel from inlet side of filter and check fuel for rust moisture or other contaminats.
Installation is reverse. When installing fuel filter, ensure fuel flow direction arrow points to front. Should have at least 5 liters of fuel in tank before restarting. The fuel pump will be damaged if run without fuel.
PT Stanley

Jan 21, 2009 | 2001 BMW 5 Series

1 Answer

2001 bmw 525i won't start

Fuel pump is in the fuel tank.filter is either under the car on frame rail or under the hood.fuse and or relays will be under dash or under the hood.

Apr 16, 2017 | 2001 BMW 5 Series

2 Answers

Starting up a garage queen

The carb may need cleaned! make sure tires are not dry rotted! The seals may have dried out after a long wile but in most cases you should be alright!

Jan 07, 2009 | 1988 Honda CBR 600 F Hurricane

1 Answer

Fuel starvation

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

Fuel starvation

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 10, 2008 | BMW K 100 RT Motorcycles

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