For the engine and carb gurus here:
I have a Marvel MA4-SPA carb on my O-320E2D. The engine and carb used to be on a Skyhawk and will live out their useful lives on the nose of my RV9A - a far more worthy cause.
In trying to figure out what sort of fitting the carb fuel inlet (fitting with finger screen) would accept, the closest thing seems to be a standard AN6 threaded fitting with 1/4" NPT thread. However even lubricated with Permatex #2 the NPT fitting doesn't "feel" right going into the finger screen fitting. It gets quite tight only a single turn or so into the finger screen fitting.
I'd heard elsewhere (maybe here on VAF) that these carbs might need a NPSF threaded fitting. Not sure where to get one of those with AN6 on the other end. I did try the fitting with o-ring that fits into a Lycoming fuel pump and had no success. It's clear these are incompatible with the finger screen inlet threads.
Ideas? Am I being perhaps too gentle with a standard steel AN6 fitting with 1/4" NPT?
I have a Marvel MA4-SPA carb on my O-320E2D. The engine and carb used to be on a Skyhawk and will live out their useful lives on the nose of my RV9A - a far more worthy cause.
In trying to figure out what sort of fitting the carb fuel inlet (fitting with finger screen) would accept, the closest thing seems to be a standard AN6 threaded fitting with 1/4" NPT thread. However even lubricated with Permatex #2 the NPT fitting doesn't "feel" right going into the finger screen fitting. It gets quite tight only a single turn or so into the finger screen fitting.
I'd heard elsewhere (maybe here on VAF) that these carbs might need a NPSF threaded fitting. Not sure where to get one of those with AN6 on the other end. I did try the fitting with o-ring that fits into a Lycoming fuel pump and had no success. It's clear these are incompatible with the finger screen inlet threads.
Ideas? Am I being perhaps too gentle with a standard steel AN6 fitting with 1/4" NPT?