2010 SJ intermittent stall below half tank

EB18

EB18

Location
Ontario, Canada
Seeking advice. Not on here much so I appreciate any input.

I've got a 2010 superjet. Under the hood it's bone stock other than a primer I installed and I run at around sea level. Fresh water lakes only.

With a full tank of fuel the sj runs perfectly. Easy cold start, snappy throttle, lots of power and can hold WOT as long as I want without issue. The problem comes when I run below what appears to be about half tank. It will bog as if someone is magically pressing the kill switch. If i'm quick enough I can hit the primer and it will immediately come back to life as if nothing happened. The lower the fuel gets the more frequent I have to prime to keep it going. once i'm down to about 1/3 tank it's practically un-rideable. Switching from "ON" to "RES" doesn't seem to help which is odd.

Limp it back to the dock, refuel and it once again rips no problems what so ever.

- Checked the tank for water, none.

Ideas?
 
T

te4250

Location
Western NY
Is it possible your tank isn’t venting? Seems weird that it would take that long to starve for fuel if that was the case but maybe. Do you hear air rushing in when you pull the cap off to fuel/have you tried unscrewing the fuel cap when it dies on you?
 
EB18

EB18

Location
Ontario, Canada
te4250 said:
Is it possible your tank isn’t venting? Seems weird that it would take that long to starve for fuel if that was the case but maybe. Do you hear air rushing in when you pull the cap off to fuel/have you tried unscrewing the fuel cap when it dies on you?
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Tank is venting fine. If it sits in the sun for a while and I take the cap off you hear a "woosh" as fumes escape. I'm able to blow into the green vent line into the tank with little effort.

I was wondering if it was a fuel draw issue, but then i'd think that would cause more of a sputtering or leaning out symptom rather than just stalling out.
 
AAlamo

AAlamo

Location
Dalhart, TX
Had this same problem on one of my Fx1’s. Right around a half a tank it would start to bog and continue to get worse. I switched to a spare tank that I had and problem went away. Never really figured out what was causing it...
 
V

Vortex

Location
Southeast
Could be the fuel sloshing around and uncovering the fuel pickups. The old trick of replacing the rigid fuel pickups with sections of fuel hose and clunk filters at the end may help. Those can drift around and sort of follow the fuel around in the tank.
 
EB18

EB18

Location
Ontario, Canada
Vortex said:
Could be the fuel sloshing around and uncovering the fuel pickups. The old trick of replacing the rigid fuel pickups with sections of fuel hose and clunk filters at the end may help. Those can drift around and sort of follow the fuel around in the tank.
Click to expand...
May be worth a shot. As mentioned above the ski runs like new above 1/2 tank so I don't think there's a vac leak, air intrusion around the primer diaphram or some sort of carb issue. Certainly seems like a pickup issue. Just wondering if anyone else has experienced this or if it's common.
 
F

faceplant2

Location
Michigan
1990 SN 650. Mine just started doing something similar. 1/2 tank - ski bogs and bogs some more then stalls. I have to give it a little gas and sometimes have to use the choke to start it then ride slowly back to the house. Fuel up then acts like nothing happened. Going to watch this thread for sure.
 
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