I left my K12RS at Hurn a few weeks back and always wonder if it is going to start ok. Actually, I had your type of problem but remember I am referring to a K12. Some times I would turn the key and get the fuel pump whine, then other times nothing, no pump, no starter. Once the bike got started I could ride for miles. Exactly the same thing happened at Hurn, but once started the bike went all the way up the M27. Stood overnight then would not start next day.
I had two different problems at the same time. For a few months now my aftermarket alarm/immobiliser has not always responded to the key fob at gas stations and airports. I sorted that which was due to strong radio frequency pickup blocking out the receiver. If you have an alarm immobiliser remember it is always in the starting circuit.
The next problem I eventually traced to bad fuses. Your bike may have different fuse numbering to my K12. Find the fuse that runs the ECU and fuel pump (mine is F4). The BMW blade fuses have their fuse wire visible along the top edge. In my case the wire did not look broken, but was actually broken at one end and making intermittent contact with ibes from the bike. I have got rid of all those BMW type fuses and replaced them with the type having the wire protected by the plastic moulding (Halfords).
You need to confirm a few things. When your bike won't start, do you hear the fuel pump at key on? Is the bike cranking or not?
I made a pressure tester using my old plastic quick disconnects, a hose tee piece and a 0-60 psi pressure gauge. Machinemart or Hampshire Hose well sell you the bits and you can even use straight hose tails and hose clips if you have no spare QDs.
A crude test is to turn the key on to run the fuel pump. Turn the key off and leave for 5 minutes. Then carefully disconnect the fuel flow hose over a bucket and push in the center if it is a QD. If fuel stills comes out under pressure, then I think your pump is ok. Mine will do this after 20 minutes!
Have you checked that the fuel tank vents are clear? When you get the bike going, idle it for 10 minutes then lift the gast tank flap. If you hear a whooshing noise as air runs in you have blocked tank vents.
You have to try and isolate the issues and fault find when the fault is there. A starter motor not cranking is completely different to a fuel supply problem and completely different again to an ignition/lack of spark problem. Work in reverse. When the bike will not start or stops running, pull a plug and check for spark - eliminate the ignition. Then move on to the fuel system - check for voltage at the fuel pump connector when in the fault state and see if the fuel rail has remained pressurized or not. Check your interlock and cut out circuit.
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