Honda Motorcycles - FireBlades.org banner

1 - 6 of 6 Posts

·
Registered
Joined
·
242 Posts
Discussion Starter #1
Hey folks after watching a few you tube videos I noticed everyones blade primes the fuel for 2 seconds and then stops.

Mine keeps priming :eek: It has been sitting since 2012 and I'm currently working on it to get it MOT ready. She does start up no problems.

So has anyone had this before and or any suggestions as to what to look at?

Thanks!

Andy
 

·
Registered
Joined
·
242 Posts
Discussion Starter #2
So the issue takes a twist!
The fuel pump was hot wired to run when the ignition was on! No fuel cut off relay under the seat just a wire cut in from the loom to supply the fuel pump :eek:

I checked the headlight relay in the plug and nothing happens when the bike is switched on. Guess that's why the mod was done.
I've removed the mod and bridged the plug using a jumper connection. That way the pump is always on but if I hit the kill switch it now turns off the pump.

I tried running the bike then disconnecting the fuel pump and the bike then cuts out.

So I'm I correct in understanding the fuel pump has to be running for the bike to operate.
It's not just for priming the injectors but also for constant supply of fuel?
 

·
Registered
Joined
·
18 Posts
I believe that the priming is just the same as turning the throttle on a carb bike before starting. After 2 seconds, the pump stops until the bike is started so that it's not running continuously and burning out the pumpt or draining the battery if you leave the ignition on accessory. Once the bike is running, the fuel pump is constantly supplying fuel.
 

·
Registered
Joined
·
7,455 Posts
The pump needs to keep about 50psi supplied to the fuel rail to feed the injectors.
Check that your bank angle sensor relay is working properly, (maybe it's called engine stop relay for the 929?), it's tied into the power for your fuel cut relay.
You might test the bank angle sensor itself as well.
You might also check your fpr for any signs of leaking at the vacuum hose too. Just pull the vac hose, then get the pump to prime and make sure no leaking gas. I mentioned that because you said the bike was sitting for a spell, and it's not uncommon for the diaphragm to rot from sitting so long with fuel in it.
 

·
Registered
Joined
·
242 Posts
Discussion Starter #5
Wow in that case the fuel injector power (black cable) must also be bypassed as the bike runs fine.
Looks like from the schematic engine stop relay or lean angle sensor as you say could have a part to play why the factory setup isn't working.
Only one of the black wires to the fuel cut off relay had a voltage on it. Which could be the one from the ECU.
Either the sensors are dead or the ECU :eek:
 
1 - 6 of 6 Posts
Top