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Problem - no power to the fuel pump Tue Aug 22, 2023 6:02 pm
Rochen
active member
Hello everyone,
Let me give you a bit of context. Last Saturday, I went on a ride with my 1986 K100 8v motorcycle, and after about 15miles, the bike broke down on me. The symptoms were similar to fuel starvation, as if you were running out of gas.
Over the past few days, I've been testing and checking things, and here's how it went:
Upon removing everything, I noticed that there was this filter, is this the correct one?
Then, while making sure the fuel pump was working properly, I connected it back, but there was no sign of movement. I tested it with a multimeter, and there's no current reaching it! No wonder isn't working. Do you know what could be the issue? Fuel level sender? Check the wiring?
On another note, while searching for information on the forum, I found that you can bridge fuse 6 of the pump with the positive terminal of the battery, and there should be movement. However, there's complete silence.
And one last question, I've taken a video inside the tank. It seems like there's some debris but not too bad. However, I couldn't identify the fuel level sender. Instead, I saw 2 wires that go directly from somewhere to the pump.
Thank you very much, everyone. I've attached the video.
Fuel pump function
Interior fuel tank
PS: I also checked the fuse for the pump and it's ok
Let me give you a bit of context. Last Saturday, I went on a ride with my 1986 K100 8v motorcycle, and after about 15miles, the bike broke down on me. The symptoms were similar to fuel starvation, as if you were running out of gas.
Over the past few days, I've been testing and checking things, and here's how it went:
- First, I checked if the spark plugs were producing a spark. I also tested each spark plug with each spark plug wire, and all possible combinations produced a spark. So, I've ruled out spark plugs, wires, and coils.
- Second, I checked the injectors. It seemed like there was fuel coming out, but very little. I removed and cleaned both the injectors and the injector rail.
- I also checked the air filter just in case, it was a bit dirty but nothing serious.
- Finally, I removed the fuel pump, connected it directly to the battery terminals, and it was pumping fuel well, both with and without the fuel filter.
Upon removing everything, I noticed that there was this filter, is this the correct one?
Then, while making sure the fuel pump was working properly, I connected it back, but there was no sign of movement. I tested it with a multimeter, and there's no current reaching it! No wonder isn't working. Do you know what could be the issue? Fuel level sender? Check the wiring?
On another note, while searching for information on the forum, I found that you can bridge fuse 6 of the pump with the positive terminal of the battery, and there should be movement. However, there's complete silence.
And one last question, I've taken a video inside the tank. It seems like there's some debris but not too bad. However, I couldn't identify the fuel level sender. Instead, I saw 2 wires that go directly from somewhere to the pump.
Thank you very much, everyone. I've attached the video.
Fuel pump function
Interior fuel tank
PS: I also checked the fuse for the pump and it's ok
