Gang, I could use a little help here.
I believe a buddy's engine driven fuel pump is failing and causing fuel pressure to fluctuate.
Why would it be worse at peak EGT vice well rich of peak EGT? And be worse means variable sound, feel, indicate, RPM change, etc. Frequency is about 2Hz.
BTW, this is on a Continental IO-520 in a Viking and turning on the electrically driven fuel pump to high-flow smooths everything out.
Thanks!
-Jim
I believe a buddy's engine driven fuel pump is failing and causing fuel pressure to fluctuate.
Why would it be worse at peak EGT vice well rich of peak EGT? And be worse means variable sound, feel, indicate, RPM change, etc. Frequency is about 2Hz.
BTW, this is on a Continental IO-520 in a Viking and turning on the electrically driven fuel pump to high-flow smooths everything out.
Thanks!
-Jim