I had a few minutes at lunch to troubleshoot the fuel pump issue. I unplugged the fuel pump and put the meter on the harness. Key on, no juice. I pulled the seat off and checked the fuse. The 10A I’d installed while I was in the parking lot down the street was still in place and not blown. I checked the hot side of it and found no juice there, either. I pulled the relay from it’s socket and the battery side of it had no juice. I traced that down and found an inline fuse holder I’d forgotten was there! The 10A fuse in it was blown.

I replaced that one, put a 5A back in the fuel pump fuse holder and verified that I had power to the connector. I turned the key off, plugged in the connector, turned the key on and SNAP! The 5A blew with considerable alacrity.

The coil on the motor reads a pretty normal 1.5 ohms, so my second theory that some debris has jammed the impeller seems likely. Stall current would be about 8A.

I have looked around… A fuel pump from a local bike salvage yard (which moved across town, much closer to me now!) is still a bit high. The one model he has several of and thus charges the least for is still $150. I can get them all day on eBay for half or less of that, but I can’t just walk into eBay and pick one up….

Before I purchase one, I will pull the pump out and see if I am lucky enough for the debris to be lodged in the back of the pump where it can be removed or flushed backward or something before replacing it..

In related news, it occurs to me that I may be able to use these throttle bodies for a while longer by lowering the fuel pressure a bit, delivering less fuel, thus perhaps get a leaner minimum mixture. As it stands, at idle the injectors are opening for what is just about as short a period as possible and it’s delivering too much fuel. The regulator I have is the hard set unit that came with my salvage fuel pump. It appears to be set to about 43 psi, which is pretty much normal. I ordered an adjustable regulator which will run 0 – 100 psi. I think I am going to try about 35 or so to start with.

While I’m doing all this fuel system work, I think I will wire in that tilt disconnect switch that I’d forgotten about… And since I forgot about the other inline fuse holder between the battery and the relay, I will update the wiring diagram, too.