2008 mastiff
New Member
hi guys i have a 2008 big dog mastiff 117 sns efi with baker 6 speed. went to start bike everything seemed fine but the fuel pump will not engage any relays or fueses on this bike
fuel pump
- Thread starter 2008 mastiff
- Start date
Something like; test light down at the pump housing harness; disconnect the wires; key on and do I have power down to the pump at the main wire harness side? No power, I rule out a seized motor not turning. But if I have power down to the pump, I changed the fuse because it blew, or say the pump is shorted internally that blows the fuses.
2008 mastiff
New Member
motor turns over fine plugs are firing fine but when the key is turned you do not hear the fuel pump energize
2008 mastiff
New Member
I've had the bike for 3 years no problem with anything I've not changed anything out on the nike
2008 mastiff
New Member
I've hat the bike for 3 years I've never changed anything in the bike
Jwooky
Well-Known Member
The pump is powered through a relay and breaker under the left side cover controlled through the VFI controller, not EHC.
First make sure the breaker isn’t tripped. (Test continuity, or 12v across it)
Next, under the forward side of the tank there is a connector with 4 wires.
After key on, you should see 12V for ~2 seconds for pump prime between the red and black terminals.
If all this is ok, then the pump is bad.
First make sure the breaker isn’t tripped. (Test continuity, or 12v across it)
Next, under the forward side of the tank there is a connector with 4 wires.
After key on, you should see 12V for ~2 seconds for pump prime between the red and black terminals.
If all this is ok, then the pump is bad.
Last edited:
2008 mastiff
New Member
thank you ill check it and take a couple pics i think someone has changed to stuff on the bike before me
2008 mastiff
New Member
12 volt at red and black wires under tank
pulled tank off pulled fuel pump out 4 wires from fuel pump GRAY -YELLOW/RED-brown/yellow-and black if you put volt to gray and ground brown pump ingages
Reply #8. See ECH Interface T? That sends out a timed priming window upon startup. Looks like the ECH.
Blue circle around relay; is hot from battery to relay. Relay control 4 has to be grounded via controller(?) to cause the magnetic windings to pull the bar down at 25 so the bar connects to red and hots the injectors, motor, and oxy sensors. So are you saying with key on, you show voltage out to fuse 25, yes? And say you have volts at at the injector wire A, yes? So 12v into relay, key on, press start switch, kill on, you show no volts at the injectors, yes?
So on the harness side of the pump, key on, the test light should come on and go off is key prime with kill switch on.
At ECH Interface T, is there voltage going out with key on? Where this should be your first test to see if it's the ECH first.
Blue circle around relay; is hot from battery to relay. Relay control 4 has to be grounded via controller(?) to cause the magnetic windings to pull the bar down at 25 so the bar connects to red and hots the injectors, motor, and oxy sensors. So are you saying with key on, you show voltage out to fuse 25, yes? And say you have volts at at the injector wire A, yes? So 12v into relay, key on, press start switch, kill on, you show no volts at the injectors, yes?
So on the harness side of the pump, key on, the test light should come on and go off is key prime with kill switch on.
At ECH Interface T, is there voltage going out with key on? Where this should be your first test to see if it's the ECH first.
2008 mastiff
New Member
the 4 wires from the fuel pump and connector is completly gone any ideas what wires go to what wires
Mikeinjersey
Well-Known Member
You may want to open a new post for your problem. Your post is pretty vague as written.
And a picture also