Fuel Problem - K-Bikes.com - Excellence in Motion
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post #1 of 3 (permalink) Old Apr 20th, 2014, 2:30 pm Thread Starter
Join Date: Apr 2012
Location: surrey, , England, UK
Posts: 86
Fuel Problem


I seem to be stumbling from one problem to the next on my 43000mile 98 K1200RS at the moment!
Only the text in italics is relevant to the fuel problem
In the past few weeks:
Ran out of fuel (my gauge was not working) from full to empty after only 126 miles (30.5 MPG) Reset TPS fuel economy back to normal now.
Fixed fuel float unit, it was dented and I managed to make it round again so that the float could move up and down.
After less than 100 miles the bike appeared to have ran out of fuel. I pushed it to the garage and filled it up, it only took 17 litres and as you know the tank holds 21L

Went to sort wires out to Right hand grip only to find that a previous owner had really botched them up (all sorted now with fresh connectors and heat shrink)
Replaced throttle cable
Discovered after assembly, that only one throttle body spring was in place, stripped back down and reattached said spring
Tried to clear fuel tank vent, I think I did
I have had to drill a number of fastenings out, I have now replaced all my fairing bolts.
Changed thermostat after a leak.
Re-done thermostat and fitted a new thermostat cover after another leak, it appears to be dry at the moment.

Now Todays Problem
[I]After all the above I had forgotten about the fuel problem, got to just less than 100 miles since my last fill up and came to a stuttering halt, although there was fuel in the tank. Opened petrol cap, in case it was a vent/vacuum problem, still wouldn't start! Walked home, returned to bike and put a couple of litres of petrol in it and rode home.

[I]My question is could I have blocked a reserve type pipe or breather pipe in the fuel cell when I inserted the repaired fuel float unit?

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post #2 of 3 (permalink) Old Apr 20th, 2014, 5:40 pm
Join Date: Mar 2004
Location: , , UK
Posts: 3,750
The float unit has nothing to do with the bike not running as long as there is fuel in the tank.

You have messed with a lot of things and there is the potential for complex faults.

There is no 'reserve' pipe.

You may have had a vacuum/ blocked tank breather problem and flooded the motor trying to start it. Leaving the bike just let the flooding evaporate and you got it started coming to an incorrect conclusion the problem was fuel related.

You start these bikes with the throttle on the stop, not rolled on. If it does not start after 3 cranks max something is wrong and you run a risk of flooding.

When you mess around inside the tank you should make sure the fuel filter is recent new or replaced and all the Oetiker hose clamps on the internal hoses are fitted, tight and there are no kinks.

It is possible to get an airlock in the fuel supply if you have had hoses disconnected. If you have Quick disconnects fitted, poke the non valve on the pump flow side to get fuel through, then reconnect the fitting.

When you first turn the ignition key you should always hear a re-assuring 'whirr' for about 3 seconds. If that 'whirr' sounds odd you have an air lock. If you do not hear it at all you have a pump or electrics problem.

Running the fuel tank low carries a big risk of crap being sucked into the input strainer and filter. Also the electric fuel pump is cooled by the fuel surrounding it. Fuel pumps are expensive!

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Last edited by voxmagna; Apr 20th, 2014 at 5:46 pm.
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post #3 of 3 (permalink) Old Jun 3rd, 2014, 5:01 am Thread Starter
Join Date: Apr 2012
Location: surrey, , England, UK
Posts: 86
Fuel Problem Update

Just a quick update:

I have now sorted out the fuel problem, it was a venting problem. I used strimmer wire and gentle air pressure to clear the vent. I did it form the tank vent just inside the fuel cap and from underneath where it vents under the engine, I blew quite a lot of gunge out of there.
Now when I open the fuel tank, their is no longer a whooshing noise

Thanks for the advice.

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