Finally a video showing a working K bike fuel pump in action, which is what I have been looking for. Everyone else just assumes you know it's dead - or working - without actually showing it pumping normally and cuts to the replacement. Thank you.
Since I have found your videos I have learnt a lot of useful information to keep my bike running , yesterday I checked my drive train oil , gear box oil , ( with the cable tie ) dip stick perfect 👌, changed my Engine oil and put new spark plugs in , so already to go when the weather picks up . Thank you for the information and clarity , look forward to the next video, well done 👍 I've had my K 75c for 14 years and I think there an underrated bike , but in reality they are a great bike .
Great job putting all this together. Would love to have seen you follow through with some electrical problem troubleshooting. But really, this was superb. Thanks.
Thanks Paul. I have done a video on tracing the wiring for the oil pressure sensor but for the fuel pump it was just a straight replacement of the level sender loom.
You were pretty lucky. With mine, after 32,000kms the black suspension rubber had dissolved and carefully distributed itself all through the tank inner. It was like a coating of tar. Hours of cleaning ensued. The fuel was always non ethanol, quality, 95 or 98 octane, so, who knows?? After a new pump, suspension rubber, strainer screen, and all new rubber hoses and clamps, it still wouldn’t start. Traced eventually to the four wire connector under the right hand side panel. I cut it out and replaced it with a new, automotive four wire snap connector. It then started instantly. The original pump had seized solid, probably the melted rubber all through it.
Mine had done the same thing. 3700 miles on it, then sat for a quarter century half full of rotting fuel. Mine was also a miniature diorama of the Labrea Tar Pits thanks to that rubber gasket.
Thanks for this video. I was wondering how you got the plastic insert out. Now I know, just taken mine out to install new one. Easy when you know how, it's the same set up for the K1100LT, cheers safe riding .
Sorry, no. What I did was get a new fuel level sender (secondhand £40) and that cured it. The tank connector is well known for falling apart and many people wire in a modern one to replace it to prevent cut outs.
@@johnnysevengun thank you. The float assembly and wiring harness sure sits at an odd angle . Almost right on top of the fuel filter... guess I’m going to have to get in there
Hi, thanks for the video, it helped me alot. Did you manage to resolve the problem in the end? I got a 1991 K100RS last saturday which i've driven for about 250 km with no problems. Great bike, really happy with it. But: i wanted to take it out for a drive today as there may be a problem with the gearbox as it seemed to fly into neutral while accelerating at times, but it wouldn't start. The starter is cranking fine, previous owner replaced the battery a few weeks ago, but couldn't hear the fuel pump. I took it out, tested it with a 12v charger thing, the fuel pump started spluttering petrol all over the place so that seems OK. Then i tested the 2 leads that go on the fuel pump for voltage, and when i turn the key it gives a nice 12v reading on the multimeter. My question: did you check the leads like i did and, more generally, was it a wiring problem in the end? I've yet to check for compression and such (don't have the tools yet) and maybe the spark plugs are due a change, but the absence of the fuel pump gurgling had me a bit worried. Thanks in advance
Yes. What happened is that the fuel pump wiring goes into the same connectors in the tank as the fuel sender and these had failed. On some bikes they fail when they warm up and then reconnect making it a difficult fault to diagnose. I bought a secondhand fuel sender from Motorworks for £40 (they are well over £100 new) and that cured the problem.
Okay thanks for the information. Does sound like the sender then. This bike wasn't used much by the previous owner and me driving it was probably the first proper warm-up it had in a long time. I'll check the sender next then! Thanks
Sounds about right. I rode my bike solidly for 13 years - now i am a fair weather biker and it sits for long periods without a good run. Inevitably the 30 year old parts fail.
Yeah, i keep having to remind myself i'm dealing with a pretty old bike. Wouldn't think that when looking at it tho, everything looks really good, previous owners took really good care of it. Oh well, i'll take it apart further tomorrow, i'll let you know what happens. Thanks so far.
@@johnnysevengun No, I'm in the UK, and looks can be deceptive. My 1986 K75S strainer crumbled as soon as I gave it the full gravy, so I learned the hard way. The easy way is when someone tells you about it.
Finally a video showing a working K bike fuel pump in action, which is what I have been looking for. Everyone else just assumes you know it's dead - or working - without actually showing it pumping normally and cuts to the replacement. Thank you.
Glad it heped.
Since I have found your videos I have learnt a lot of useful information to keep my bike running , yesterday I checked my drive train oil , gear box oil , ( with the cable tie ) dip stick perfect 👌, changed my Engine oil and put new spark plugs in , so already to go when the weather picks up . Thank you for the information and clarity , look forward to the next video, well done 👍 I've had my K 75c for 14 years and I think there an underrated bike , but in reality they are a great bike .
I am very glad the videos are helpful.
Great video. This will help in sorting out my K1100 fuel pump problems. Thanks
No problem 👍
Great job putting all this together. Would love to have seen you follow through with some electrical problem troubleshooting. But really, this was superb. Thanks.
Thanks Paul. I have done a video on tracing the wiring for the oil pressure sensor but for the fuel pump it was just a straight replacement of the level sender loom.
You were pretty lucky. With mine, after 32,000kms the black suspension rubber had dissolved and carefully distributed itself all through the tank inner. It was like a coating of tar. Hours of cleaning ensued. The fuel was always non ethanol, quality, 95 or 98 octane, so, who knows??
After a new pump, suspension rubber, strainer screen, and all new rubber hoses and clamps, it still wouldn’t start. Traced eventually to the four wire connector under the right hand side panel. I cut it out and replaced it with a new, automotive four wire snap connector. It then started instantly. The original pump had seized solid, probably the melted rubber all through it.
Mine had done the same thing. 3700 miles on it, then sat for a quarter century half full of rotting fuel. Mine was also a miniature diorama of the Labrea Tar Pits thanks to that rubber gasket.
@@nsleavitt1 Yep, worst crap ever to clean up.
Thanks for this video. I was wondering how you got the plastic insert out. Now I know, just taken mine out to install new one. Easy when you know how, it's the same set up for the K1100LT, cheers safe riding .
Great video, thanks, I assume the K100 is the same ( K75s are not that common in Australia, K100s are everywhere, haha).
They are the same. The position of the pipes varies a bit according to year.
Hello, thanks for the video. Do you have one that continues with electrical problem? Pulled my pump and it’s also fine.
Sorry, no. What I did was get a new fuel level sender (secondhand £40) and that cured it. The tank connector is well known for falling apart and many people wire in a modern one to replace it to prevent cut outs.
@@johnnysevengun thank you. The float assembly and wiring harness sure sits at an odd angle . Almost right on top of the fuel filter... guess I’m going to have to get in there
Well done.Concise.
Hi, thanks for the video, it helped me alot. Did you manage to resolve the problem in the end? I got a 1991 K100RS last saturday which i've driven for about 250 km with no problems. Great bike, really happy with it. But: i wanted to take it out for a drive today as there may be a problem with the gearbox as it seemed to fly into neutral while accelerating at times, but it wouldn't start. The starter is cranking fine, previous owner replaced the battery a few weeks ago, but couldn't hear the fuel pump. I took it out, tested it with a 12v charger thing, the fuel pump started spluttering petrol all over the place so that seems OK. Then i tested the 2 leads that go on the fuel pump for voltage, and when i turn the key it gives a nice 12v reading on the multimeter. My question: did you check the leads like i did and, more generally, was it a wiring problem in the end? I've yet to check for compression and such (don't have the tools yet) and maybe the spark plugs are due a change, but the absence of the fuel pump gurgling had me a bit worried. Thanks in advance
Yes. What happened is that the fuel pump wiring goes into the same connectors in the tank as the fuel sender and these had failed. On some bikes they fail when they warm up and then reconnect making it a difficult fault to diagnose. I bought a secondhand fuel sender from Motorworks for £40 (they are well over £100 new) and that cured the problem.
Okay thanks for the information. Does sound like the sender then. This bike wasn't used much by the previous owner and me driving it was probably the first proper warm-up it had in a long time. I'll check the sender next then! Thanks
Sounds about right. I rode my bike solidly for 13 years - now i am a fair weather biker and it sits for long periods without a good run. Inevitably the 30 year old parts fail.
Yeah, i keep having to remind myself i'm dealing with a pretty old bike. Wouldn't think that when looking at it tho, everything looks really good, previous owners took really good care of it. Oh well, i'll take it apart further tomorrow, i'll let you know what happens. Thanks so far.
The strainer on the pump should be replaced. They're easily available. They go brittle and disintegrate, wiping out the pump.
This seems to be more of a problem in America than the UK. I think the fuel content is different. As you saw in the video mine was in good condition.
@@johnnysevengun No, I'm in the UK, and looks can be deceptive. My 1986 K75S strainer crumbled as soon as I gave it the full gravy, so I learned the hard way. The easy way is when someone tells you about it.
Good advice.
Taking the sender out wasn't too much trouble? Does this sound/look like a similar problem? ruclips.net/video/x7Kr5Kv4ssA/видео.html