K 75 S died

[ackgs]

And I was doing so well. Received my new to me fuel tank Friday and installed my old fuel pump, which ran, and tank internals. The bike fired right up after sitting for a couple of years sidelined with a bad fuel tank. Anyway the bike was running like a champ and I had put a hundred miles on or so this weekend. This afternoon while riding slowly on cobblestones the bike died. I had figured that something had vibrated apart. Got it home fuse is good and I have 12 volts on the green with white stripe and the brown at the tank connector when I push the starter button. According to my wiring diagram that powers the pump. I am thinking my fuel pump has gone south. I will go into the tank tomorrow and pull it out and test. I was wondering if you guys think I am on the right track or am I overlooking something else? I'll know more when I can break things down tomorrow after work. I will see if I have power on the pump leads. I did install a new tank sender unit, anyone have a failure with the wiring in one of those units where it passes into the tank? As back round I purchased the bike, non running, about four years ago and put a new pump in then and got it running well but I the tank leaks kept coming back and I parked the bike so the pump has been sitting in an empty tank for two years.

Any help would be appreciated.

[johnny]

greetings ackgs...

welcome to motobrick.com...

need more information... such as on center stand key off... turn key on what happens... is your dash lit up... do you have low beam high beam tail light brake light turn signals horn...

when you press the starter is the kill switch in the center position... does the engine turn over... does it turn over with the clutch lever pulled in...

what year is this moto... abs... give it up... whats going on...

j o

[Chaos]

Cobblestone?  Good Grief.  Check the big plug going into the computer above the battery.  And what he said.

[ackgs]

Thanks for the welcome I have lurked for a while but the K has been on hold. Sold the GS so I can turn my attention to the K - really enjoy it. Really never came to like the GS.

Don't have it out of the pickup yet so no stands just strapped in the bed but when I turn the key on panel lights up. Kill switch off panel goes off kill switch on panel back on. Hit starter button engine turns over, well. Not sure but would guess that I tried the to start it with the clutch both in and out. All lights, turn signals, horn etc. work. Bike is a '91 K 75 S no ABS. Don't hear the pump running if I put my ear to the tank. To this amateur it says "no gas" or ignition. I did try to start it on the side stand while waiting for my son to come fetch me. All the relays are still tight.  Am I testing the right pair at the tank connector? I tested that pair back when I was getting everything ready while awaiting the new tank and had 12 Volts on those two wires when the starter was depressed. At that point I was sure those were the pump leads but maybe not. It does everything but run, not even a cough or sputter. It has not been hard to start since I put it back together it has been firing right up - until this afternoon anyway.

[ackgs]

Our main street is cobblestone, I live in a resort community and we reek of ambiance. What can I say I should not have gone downtown. I checked the plug (is that the motronic connector - maybe??), well pushed on it anyway while by the side of the road, as I had that apart when I replaced the battery before tank install. I have not unplugged it and reattached as I thought I was on to something with the power on the pump feed but as near as I can figure no pump function. 

[ackgs]

Deleted

[Scott_]

I think are on the right track to check the wiring/power at the pump in the tank. You are also on the correct wires green and brown.
It's not to common for the "pass thru" of the sending unit to break, but it has happened to some. You said that you installed a NEW sending unit assy? If so then the ground connection(internal) should be good as well, but it would be worth a check to make sure the solder joint didn't break.

[Chaos]

another easy check, jiggle the key and work the kill switch a couple times.  I've seen a couple old K's where that did the trick.

[ackgs]

Thanks guys - The sending unit is new, factory part. While I was hanging out waiting for my ride I did try the key switch and kill switch jiggle. Not to say that is not the cause but the appeared to be OK.

The bike is in very good shape for it's age. It had just over 11,000 mile when I got it 4 years ago, always stored indoors. The PO had let it sit and the tank and original fuel pump were toast. Back then I tried to repair the tank, installed the new fuel pump and filters etc. Got it running but it was still not running well. Rolled the dice and sent the injectors out to be cleaned and that did the trick. Rode it for a while and the leaks returned so drained the tank and it has been in my garage since.

[ackgs]

Well it was the pump  :2thumbup: I drained the tank and tried the starter and nothing.  Unclipped the pump, disconnected the fuel line and the power leads from the pump. Tested the leads and had 12V with the start button depressed, reconnected the leads to the pump and still no function. Removed the pump from the bike and tested the leads again and had voltage. Hooked the pump to a battery and the pump ran, go figure. Thought about it, didn't have a spare pump so I reinstalled the pump the bike started right up. So put everything back and went for a ride. Put about 20 miles on and the bike ran fine. Performed a couple of "acceleration tests" and no stumbles.

So what was the problem? A little crud stuck in there? Anyone experienced anything similar? I am not going anywhere far so I think I'll just leave the old pump in and see what happens. 

[Chaos]

Must have jiggled something than needed jiggling. Hard to say if it will come back.  Try a couple miles of cobblestone hahaha

[ackgs]

Yeah sort of weird, I'll give the cobblestones another run. I'll make sure my son is available to come get me first though   :falldown:

[Dennis de Vries]

I've read somewhere that the connectors can develop some play over the years, maybe that's your problem? Try crimping the connectors a bit, so they fit real snug again, maybe?

[ackgs]

Good idea Dennis I will check them when I am back in there. The sending unit is brand new and the ring tongues seemed OK when I attached them to the pump. Still all a bit perplexing, as I said I will be just riding around locally. I live on island so my riding is not very far from home. If I want to go farther I need to get on the boat. I will see if it does it again, will order a spare pump so I will be ready.

I appreciate the help and suggestions guys.