Originally Posted by
nrpetersen
A quick update on my J4A fuel supply with a C-85 and cowl tank.
I added a 1/4 dia forward facing pitot tube to the fuel cap using epoxy, added an aluminum doghouse around the firewall-mounted gascolator. I also added fire sleeving to the fuel line between the gascolator and the carb inlet. This dropped the max temperature rise (over outside ambient) of the gascolator bowl from 60 degF to about 10 degF. All three were done at the same time so I have no way to know the comparative effects of either modification. The carb is a new Marvel Scheibler, and the above fuel flow tests were done at ~ 1/3 full cowl tank.