Burried in my WOT thread was mention of a Racor fuel filter vacuum gauge alternative. Mark forwarded me a link where somone described using these instead of the $100 per gauge option from Racor directly. This was a 5 min install and appear to work well. They also seem really well made (better than I thought).
At idle, I get a reading of around 7.5hg on a brand new filter. I get just around the same reading on my other engine but that filter is two years old with about 130 hours. If I read correctly, the initial reading does not matter so much because it will vary by engine/configuration. Once you have that baseline, I think you want to change the filter if it rises about 5hg above your baseline.
Do I have that part correct? I wish my old filter had a higher reading which I was sort of expecting but my fuel system is really clean from end to end. Ethanol is good for that!
At idle, I get a reading of around 7.5hg on a brand new filter. I get just around the same reading on my other engine but that filter is two years old with about 130 hours. If I read correctly, the initial reading does not matter so much because it will vary by engine/configuration. Once you have that baseline, I think you want to change the filter if it rises about 5hg above your baseline.
Do I have that part correct? I wish my old filter had a higher reading which I was sort of expecting but my fuel system is really clean from end to end. Ethanol is good for that!