Quote:
Originally Posted by duck9191
So I loosened the check valve on the output side and it didn't seem to help, most of the fuel goes back into the bowl. So I checked the check valve in the accelerater pump bowl and it looked good. I flushed it out and put it back together and it's still back feeding into the bowl. Maybe there is a machining defect or something.
As you can see, if you quickly fully depress the plunger it will shoot gas out the output but it's still back feeding.
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The check valve orifice/jet for the nozzle is still turned in too far both in the video and in the picture below it. That needs to be backed out until the top surface of it is nearly even with the bowl flange as I mentioned previously. In the video and picture it is too tight/screwed in way too far. The inside of the O ring should actually be touching it. Compare my last picture to your first one and note the difference. That is all it takes to create too much spring tension on the check ball and cause the pressure needed to bypass it to be incredibly high.