Joe,
The first thing to come to mind is that with the alternator on-line you have a higher bus voltage which would cause the electric fuel pump to run faster and produce more pressure. But the fuel pressure regulator should take care of the higher pressure, assuming it is working properly. If the fuel pressure does rise when you bring the alternator on-line, then that could cause the engine to go rich and run rough. Just a thought...
Mark S.
On Mon, Jul 20, 2009 at 8:38 AM, <jewen@comporium.net> wrote:
Tuning is coming along pretty well on my newly running 20B. I have run into a bit of a snag. Until last week I was running only on battery power, then I brought my alternator on line. When the alternator is turned on, the engine starts to stumble and run rough. As soon as the alternator is turned off it starts to run smoothly again. Any suggestions for alternator filtering?
Thanks,
Joe
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