That is the most tuning info i have read for these old MM bikes, thanks!
I have a better looking Fuel Pump Factory unit coming from California, costs a bit more but pretty good reviews.
I will be installing this weekend. Until then I have a T@B camper to tinker with, and I just titled a new to me 1990 XR250R!q

 

makes me wonder what would happen if I had been lower on fuel and that thing bounced against the interior of the tank when it popped loose. Any chance of a spark. That nightmare fuel may be the best reason to run a carb bike, HA!

 

I have taken a lot of GM car/truck fuel pumps out with burned up ground wires and never saw one that went up in flames.
It did raise my eyebrows almost up into my bald head the first few times.
If there is a risk then it's minimal. YMMV

Good Catch on finding the problem

WP

 

Yeah, spooky stuff. I am thinking the TPS code will go away after the fix. Must have been confusing input for the old ECM.

 

I have never had any luck with any All ***** product. I replaced my OEM pump with a Quantum pump and it was a dead match drop in fit. Glad you found the problem.

carl

 

Most All ***** products are re-branded WAI inventory.

 

Correction. Looks like it is a cheaper looking pump supplied by the same folks, Fuel Pump Factory, but the new one is a quantum and looks way better. Connectors look robust and the filter screen fits TIGHT! on the other one the screen would fall off during removal. Even the rubber covers that space it in the plastic outer housing fit like they should, they were loose on the older one. Just installed it and flipped the switch about 7 times to prime it, still seem kinda gravelly and plenty loud enough to hear.
putting fresh cork and canopy screws on now to run it some, then judge the pump noise.

 

Just noticed the Fuel Pump Factory ad to the right of my thread. That's ironic.

 

or is it?
MWYHA HA HA HA HA!

 

I just put a few miles on. Bike rips like an "80 with a MM EFI and an EV-13 cam with restricted stock slip-ons. Still makes me smile.
TPS code not cleared yet, I gave her the beans and it responded, but I will check again after some trips to the Triple Nickle Diner and maybe coffee in Pomeroy.
Put some cycles on the cycle.