Need Some Major Help Here Guys...

As many of you know, I'm trying to get my bike up and running ASAP. So, to make sure everything would go smoothly prior to final assembly, I decided to test my fuel pump out the other night just for kicks. Now keep in mind, when I first wired in the Walbro pump, I tested it and it functioned perfectly. This time, however, I flip the kill switch to run and nothing happens.

I try it again. Nothing. I flip it on and off a few more times and what do you know, the pump works like a charm. I flip it on and off 3 more times to make sure everything is okay, but on the 3rd time, it stops working, and has not come on since. By now I'm thinking that either the pump is bad or a fuse is blown, but closer inspection with the voltmeter lets me discover that the pump isn't receiving any voltage. Nada.

I open the Honda manual and, believe it or not, there's actually a checklist of what to do if the pump isn't receiving any voltage:

• check the main fuse -- it's fine
• check the other fuses -- they're fine too
• check the fuel cut relay, the fuel pump relay, and the bank angle sensor -- they all work great
• check the kill switch -- I see the Power Commander turn on & off everytime I flip the switch, so that's fine as well

This leaves only one aspect left to check - and I can't even check it -- the ECM. According to the wiring diagram, the fuel pump relay only activates when sent a signal from the ECM, so right now I'm thinking that my computer took a dump. Also, for some reason, the power commander & knock light no longer light up at all when flipping the kill switch, when just a few minutes before they were working fine.


Has anybody ever encountered a problem like this before? Has anybody's ECM ever gone bad? This is so incredibly frustrating to be oh-so-close to starting this bike up, and now having the most important part of the electrical system crap out on me. By the way, I unplugged all the gauges and the problem persists, and yes, the battery voltage is fine.


Any help/input/suggestions would be greatly appreciated!!

disconnect the battery - then reconnect and try it again? I'm no whiz - but maybe something needs to reset? wish I could help more.

disconnect the battery - then reconnect and try it again? I'm no whiz - but maybe something needs to reset? wish I could help more.

I'll try that Ken, I already did reset the fault codes (quite a few come up when no sensors or injectors are connected).

As many of you know, I'm trying to get my bike up and running ASAP. So, to make sure everything would go smoothly prior to final assembly, I decided to test my fuel pump out the other night just for kicks. Now keep in mind, when I first wired in the Walbro pump, I tested it and it functioned perfectly. This time, however, I flip the kill switch to run and nothing happens.

I try it again. Nothing. I flip it on and off a few more times and what do you know, the pump works like a charm. I flip it on and off 3 more times to make sure everything is okay, but on the 3rd time, it stops working, and has not come on since. By now I'm thinking that either the pump is bad or a fuse is blown, but closer inspection with the voltmeter lets me discover that the pump isn't receiving any voltage. Nada.

I open the Honda manual and, believe it or not, there's actually a checklist of what to do if the pump isn't receiving any voltage:

• check the main fuse -- it's fine
• check the other fuses -- they're fine too
• check the fuel cut relay, the fuel pump relay, and the bank angle sensor -- they all work great
• check the kill switch -- I see the Power Commander turn on & off everytime I flip the switch, so that's fine as well

This leaves only one aspect left to check - and I can't even check it -- the ECM. According to the wiring diagram, the fuel pump relay only activates when sent a signal from the ECM, so right now I'm thinking that my computer took a dump. Also, for some reason, the power commander & knock light no longer light up at all when flipping the kill switch, when just a few minutes before they were working fine.


Has anybody ever encountered a problem like this before? Has anybody's ECM ever gone bad? This is so incredibly frustrating to be oh-so-close to starting this bike up, and now having the most important part of the electrical system crap out on me. By the way, I unplugged all the gauges and the problem persists, and yes, the battery voltage is fine.


Any help/input/suggestions would be greatly appreciated!!

If your Power Commander took a dump, it will prevent the fuel pump relay from activating as well. I'd try unplugging it real quick...

Happened to me, shortly after installing my used PC. Started up fine a few times, then I took it for a ride and it died 1/2 mile down the road and wouldn't light up anymore. :pissed:

Unplugged it and she fired right up.

I just reset the computer and unplugged the power commander -- nothing. I'm not even getting voltage to the fuel pump relay anymore.

i know your kill switch DID work, but now it sounds like it isnt. you need to start from the batter and go through the basic checks of relays to see where power is getting and where it isnt. it might have been an intermittent relay issue that has finally given up the ghost completely. doesn't really sound like ecm to me at this point

I vote kill switch.

I'd check the connections. Maybe a loose connector, or a ground not well grounded. Double check everything electrical you've done so far. I'm a bit surprised that the oem pump would not supply you with enough gas, maybe try it if you're problem persists.

SG

I'd check the connections. Maybe a loose connector, or a ground not well grounded. Double check everything electrical you've done so far. I'm a bit surprised that the oem pump would not supply you with enough gas, maybe try it if you're problem persists.

SG

I would try the OEM pump, too. Does the Walbro draw more current?

SG[/quote] Does the Walbro draw more current?
[/quote]


Needs heavier wires?