Dan
Did you end up installing a fuel pulse damper on your setup?
I’ve been chasing some odd behavior in my long-term fuel trim table—huge swings between adjacent cells, like the ones in the screenshot I attached. From what I understand, that kind of variation really shouldn’t be happening under steady-state conditions.
After reading through some of what Rivet and Winders shared, I started wondering whether those big jumps could be due to slight fluctuations in fuel pressure. During driving, my gauge reads a pretty consistent 45 PSI, but when I reviewed the fuel pressure graph, there are some subtle oscillations riding on top of that flat line.
I decided to order a Holley 12-1004 AN6 fuel damper and plan to install it this weekend. One gripe though—the fitting uses a male AN6 ORB connection, so it relies on an O-ring rather than the usual 37° flare. Not ideal, but I’m hoping it takes the edge off those pressure ripples and smooths out the trims.
