Just to re--bump this....after 6 months off the project.....
so I bought a brand new remote housing from the finishline sale, as i thought the old threads may be damaged from having the wrong fitting pushed into them, and bought a 1/2"NPT adaptor for my existing hose:
AN -10 AN10 JIC Flare to 1/2 NPT STRAIGHT MALE Fuel Oil Hose Fitting Adapter | eBay
from ebay. The chamfered end goes into the end of my hose fitting nice and neat. The square end goes into the remote house by less than 1 turn before it goes hand tight.
I can't beleive this is right - please, can someone tell me what I'm doing wrong? Even on a taper friction fit I would have thought I'd get a few turns in before needing a wrench.
Do I need a different fitting? Is it really 3/8" NPT on these housings?