Same problem. Now this is 6 yrs old. Anyone ever fix this?
New battery, new fuel pump, new relay, Fuses seem fine.

One note, when I test the power at the connector it goes up to 8-9 volts before relay kicks off at the fuel pump, If I start cranking on the engine it'll bounce up to 9 volts...not 12. Is that adequate?
Also, my new fuel pumps (XtremeAmazing) don't fit easily or well into the connector. Feels like the male/female connection is off. Can't get it to pump or connect to fuel gauge.

 

Try hooking your battery up to a jump box or larger 12v battery and test for 12v at the fuel pump if it isnt getting the 12v there then your battery is likely the culprit.

 

The battery is brand new. I got it trying to address the prior battery as potential problem, which I don't know how old it was. Multi-meter test says the battery had 12+ volts in it. Directly hotwiring the battery to the pump makes the fuel pump work.
The connection that would hook into the fuel pump gives a 9volt on multimeter during the initial priming phase and when cranking on engine.

I don't think it's the battery.

 

The next step would be to follow the harness until you found what part was limiting down to 9v

 

I guess. That's where I start running into the rabbit hole and making a real mess of things.

 

So i always start these journeys by finding ground checking for resistance.if the resistance is high try a single wire ground. If ground is good note color of other wire and match on another part of the wiring harness test continuity between wire ends. If it has continuity check there for voltage. I would expect there to be a seperate relay to power the fuel system on a fuel injected bike.

 

I rarely work on Yams and only a couple of EFI Yams which have not, so far, had EFI problems but, on Hondas and Suzukis, if the engine management EFI light flashes, there is an EFI fault which can be read by the dealers computer, or often, by jumping certain wires in the diagnostic plug, the fault code comes up on the display. That is why all those people above recommended you get the Manual, which will tell you what the codes mean.

 

I bought it used with no manual. I have found online manuals and the diagnostic codes. I've gone through some of them and nothing special about them. I was guessing the fuel pump after it just sputtered and stopped one day and would not restart. The sputtering to a stop had been happening for several months before but just gave it more gas & would always start back up again...until it didnt.

I'll mess around some more with electronics but may just take it into a shop if I can get it onto a trailer.

Not a daily driver or frequently used.

 

What codes is it throwing up? Also injectors have a filter inside them. Suzuki 450 to 750 King Quads will start spluttering then get to stopping and being bad/impossible to restart, almost always is a blocked injector. Blow the injector out with an airline and you are away again. However this doesn't throw fault codes.