Back to the rough running
Hi Guys
Yesterday I thought I had your rough running nailed and was going to be able to post a video with sound of my engine doing the exact same thing with cause identified.
The key was the sound track but all my camera picked up was the howl of the fan, and when I went out this morning with a good sound recording unit I could not get the engine to repeat the performance.
But let me tell you what I found and is this something you have tested for or ruled out. Excessive fuel pressure 8psi + caused a ragged running with poor acceleration.
How did I get to this, running the 216, out of my HUP, on the test stand suddenly it started running rough without changing anything setting started checking all the gauges and when I looked at the fuel pressure gauge it was pegged. Turned off the electric fuel pump which is hooked in line with the mechanical and as soon as the engine bleed the pressure down to 4-5 psi of the mechanical pump, engine smooth right out. Turned the fuel pump back on engine started running ragged again. Looked down the carb you could even see a difference in the fuel spray plus fuel leaking. Today when I tried to repeat the problem the fuel float valve worked perfectly and seal and metered the fuel correctly.
Just another one of those fun little gremlins to track down.
Cheers Phil
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