walkman
Well Known Member
In my ongoing struggles to get my fuel flow calibrated (may have a bad red cube) I have noticed fluctuating fuel pressure. This is with a carbureted engine with the boost pump off. Sometimes the fuel pressure appears to just drop out, close to zero, for a few seconds. It doesnt just go to zero, it decreases over a second or two and increases the same way. this indicates to me that it is not just a bad connection (new efis/eis 4000).
there is no noticeable effect on the way the engine runs. But is it possible the carb bowl is not getting to empty before the pressure comes back up again?
I had something like this years ago on my old Grumman. The engine driven pump was going out. But, it had a noticeable effect on the engine running.
I'm a bit stumped.
there is no noticeable effect on the way the engine runs. But is it possible the carb bowl is not getting to empty before the pressure comes back up again?
I had something like this years ago on my old Grumman. The engine driven pump was going out. But, it had a noticeable effect on the engine running.
I'm a bit stumped.