The first thing I should mention is that I am running alcohol.
Ron set my butterflies at 0.008" and the BV leakdown at 22%. I have left the butterflie alone but have increased the leakdown to 28%.
With a 90 pill, my plugs were showing a lean condition after the run.
My pump inlet port is about 2" above the suction outlet on the fuel tank. I fill the tank before every run, so the fuel level is well above the pump inlet.
I have a Racepak system which monitors the fuel pressure (it has shown fuel pressures as hiogh as 170 psi) plus I have a gauge in the dash. The sensors are located immediately before the BV on the inlet line.
Where is the idle check valve located?
The engine was new this spring and when I ran it on the dyno, the egt and HP / torque curves were indiacting the engine wanted more fuel. At the time I had in it, the biggest jets I had (38's) and the smallest pill (60).
When the fuel shut off is closed, the slot on the barrel valve is at 3:00 and 9:00 and when it is fully open, the slot is at 12:00 and 6:00. I have checked this using air pressure.
My return line is 6 AN. There are separate return lines on both the high speed and the BV. These are the only two return lines I have installed.
I have tried removing the high speed bypass and I still have the stalling problems.
When I plug off the high speed bypass, does all the fuel from the pump go to the BV? There is no other return line from the pump to the tank other than the high speed bypass line. Would all the fuel going to the BV create a very rich condition?