mk2dave

It would also be great to confirm if the injectors will fire with the fuel pump disconnected. I lean towards yes, but sometimes manufacturers try and be smarter than necessary.

I think that is our next step. Unfortunately, pulling the injectors themselves involves taking off the throttle bodies. After reading other threads, it seems like feeling the injectors for pintle movement off of a 9v battery might be the way to go. Is there a way to see the injectors spraying fuel without removing the injectors if the throttle butterflies are held open? I am not hearing anyone suggest it may be a sensor that is stopping the injectors from firing.

I'm trying to help my brother with his 5th gen. It's been sitting for a while, and it needed a new battery. Fuel pump wasn't priming, so a new fuel pump and filter was installed. Fuel pump now primes when its supposed to, but the bike still doesn't run by itself. It turns over, and it will run on starting fluid. Fuel also comes out of the fuel return line when priming. No MIL. So Im running out of ideas here. Fuel seems to be flowing to the rail... so bad injectors? I wouldn't bet on ALL the injectors going bad. I would have expected it to run and maybe miss but still run. Is there a switch that controls if the injectors fires? It runs on starting fluid, so ignition seems not be the cause. I'm assuming fuel pressure isn't that important to get it running since it runs with starting fluid sprayed into the airbox. If FP is not correct, it wont run well, but it should run even if barely. Any ideas and suggestions would be appreciated.