Got everything hooked up, gauges go through the self test and respond to both engines running. The needle shake appears to be almost nothing which is great, but wait there's more!
I'm getting a wide fluctuation/swing on both engines. At idle, they will be around 1 GPH for a few seconds and then might swing as high as 16GPH and then come back down somewhere else. This is a Twinscan unit, GPH only.
The first thing I thought of was the 1-2" rise out of the sende units. So, I unbolted one Racor, tipped it back and zipped tied it in that position as a test on the port engine but it did the same thing.
When they settle down, the lower range seems to be about right but obviously something is way off. Jeff, I read your posts about small air leaks. Did your gauges do the same thing? No fuel leaks, everything looks good. I wound up making new fuel lines with brass aeroquip connectors.
The other thing I noticed is that they gauges don't respond when you rev up the RPM's. I was sort of expecting them to move like tachs but maybe there's a delay in processing before the needles go into motion. Revving up and down in the slip doesn't do much. The total gallons used is ticking up so it's measuring something.
Bob
I'm getting a wide fluctuation/swing on both engines. At idle, they will be around 1 GPH for a few seconds and then might swing as high as 16GPH and then come back down somewhere else. This is a Twinscan unit, GPH only.
The first thing I thought of was the 1-2" rise out of the sende units. So, I unbolted one Racor, tipped it back and zipped tied it in that position as a test on the port engine but it did the same thing.
When they settle down, the lower range seems to be about right but obviously something is way off. Jeff, I read your posts about small air leaks. Did your gauges do the same thing? No fuel leaks, everything looks good. I wound up making new fuel lines with brass aeroquip connectors.
The other thing I noticed is that they gauges don't respond when you rev up the RPM's. I was sort of expecting them to move like tachs but maybe there's a delay in processing before the needles go into motion. Revving up and down in the slip doesn't do much. The total gallons used is ticking up so it's measuring something.
Bob
Last edited: