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Just overtook a car on the A23 last night, then..... nothing, engine dead.
Quick clutch in and I'm in the centre of the road. Nice.

The bike cranks over, but no fuel pump noise, no fuel smell when cranking. All the other electrics seem fine

All fuses in the little box on the LHS are OK, cannot see any frayed wires under the fairings.

New fuel pump needed ?

Must take it out tonight - how do I test it?

pretty please...?


its a 53 plate twin spark, 63k miles.

Bad news

Getting fuel pump out is the easy bit. It's getting it back in that the puzzle

Electrics are complete mystery to me but if you are concerned about frayed wiring could you not just test the fuel pump via the wiring tail (plug) at the front RH side of the tank?


DT

Check the fuel pump connector under the tank before you pull it all apart. These are prone to corrosion, last one I fixed looked ok but the wires just pulled out.

Thanks Gents for your replies

I have replace the fuel filter errr maybe 3 years ago and remember the fun involved. So i will check the wiring etc, hopefully its just that - i am not sure that R1100s fuel pumps have a high failure rate.

Time to find the multimeter

Check for sparks; there is some connection between the Hall sensor and the fuel pump. If no sparks and no fuel pump - could be the Culprit.

bricking it wrote: New fuel pump needed ?

Must take it out tonight - how do I test it?

As above, check the connector, at 63k miles it could be the pump, sidestand switch can be involved also. It really isn't that difficult to remove the pump , and when you have it removed and well away from any petrol just connect it direct to a battery to test , i'm sure you can check for power at the connector without stripping everything although you'll have to keep switching on and off as it only primes for a couple of seconds .

oyster wrote:Check for sparks; there is some connection between the Hall sensor and the fuel pump. If no sparks and no fuel pump - could be the Culprit.

That would be my first thought if no spark and no fule i would put money on it being hall sensor
Put bike on centre stand remove plugs put them back into leads earth them put bike in gear turn rear wheel you should here fuel pump but you wont see spark engine out of gear crank on starter to check for spark if neither hall sensor, well not sensor but wireing to the sensor between block conector above motor and sensor plate

Please excuse spelling and punctuation[spellin] just back from lake district and fit to drop
Cheers all dai

Got a spark, so that bit was Ok

So on I went with the arduous petrol tank removal and it was full

Anyway, tank off:

Things not looking good









Botched temporary connection, start ignition, pump pressurises, press the starter, brrrmmm brrrmmm

Now need a proper connector



Might treat her to a new air filter








Thanks, as ever to all the trixter experts out there!

That could be your problem

While you're in there chuck a fuel filter in, if the air filter's in that state I bet the fuel filter's not far behind it.

Hein Gericke do a connector kit - 104 pieces £9.99 - might be useful

The electrical connector would have been high on my suspects list also.

Those are also a weak spot on the K100/K1100 series.

From what I have read and experienced myself, BMW fuel pumps rarely just suddenly die. While there might be the odd exception, most get very noisy way before they just crap out.

I did a 2000km trip with my K100RS with a very loud fuel pump (loud even when the tank was full), carrying a new one in the tankbag in case the old one died. Never did. Now the new one is in and the old one (cleaned up) is my spare.


Given that many of our bikes (R1100 or K100/1100) are not NEW, with any odd behavior, I always suspect corroded connectors or broken wires first.

given the frequency that these connectors are going to be disconnected, I will tape them all up while I am in there. The bike works 5 days a week throughout the year, all year. So I value reliability ! It certainly gets serviced (by me) more than the minimum but i certainly dont take it to bits to look for stuff with water damage like this

Anyway, luckily this one was no big deal. But a few weeks back I was down in south Germany ....

Self amalgamating[spelling] tape would be just the ticket for that job

I use a smear of silicone grease on the freshly polished contacts before joining the plugs. The old boys used Vaseline for the same task.