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Old 10-09-2012, 11:27 AM   #1
jconly OP
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Fuel pump wiring - I've got an extra - Why?

So, I noticed this a while back, but figured I'd ask up.

Looks like my fuel pump has a third terminal that has been taped back out of the way. The bike only has a two terminal connector.

Can anyone tell me what this pump is (can't be stock right?) and what's behind wire #3?



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Old 10-11-2012, 11:41 AM   #2
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Bump, anyone?
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Old 10-12-2012, 05:44 AM   #3
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Maybe someone replaced a broken or chafed wire?
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Old 10-12-2012, 06:45 AM   #4
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Fuel pump connector

From the factory - you'll have a three-wire set up on the tank side hooking into two wires. On my 2010 S - Red connects to Black/Blue, Brown connects to Black and Blue doesn't connect to anything. Looks likes maybe previous owner changed to two-wire connector.
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Old 10-12-2012, 10:58 AM   #5
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Awesome, thank you so much for confirming that.
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Old 10-12-2012, 11:10 AM   #6
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I had posted this earlier also in a couple of threads...

The adventure and super duke use the same fuel pumps. Only difference being that the super duke fuel pump has the low fuel sensor built into it and hence has a third wire in the fuel pump harness as well as the main harness side. The adv's have the low fuel sensor separate from the fuel pump unit hence make do with only two wires on the pump side but still have the three wire connector on the main harness side where one of the wires remain un used.
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Old 10-12-2012, 11:37 AM   #7
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Ah that totally explains it.
Looking at the wiring diagram, every drawing of the pump showed that fuel level sensor and I was a little confused, assuming that's what the third wire was for. Oh the redundancy.

I wonder if they activate at different levels?
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Old 10-12-2012, 08:43 PM   #8
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Quote:
Originally Posted by jconly View Post
Ah that totally explains it.
Looking at the wiring diagram, every drawing of the pump showed that fuel level sensor and I was a little confused, assuming that's what the third wire was for. Oh the redundancy.

I wonder if they activate at different levels?



regarding levels, yes they do activate at different levels due to the different mounting location (between Adv and SD tanks). However, due to the volume and shape of tanks, there will be close to same amount of fuel left in both tanks (approx 4 litres ?) when the sensor activates.
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