Try running the trike without the gas cap on the fuel tank. Sometimes rust can clog the fuel cap vent and cause crazy things to happen. It's a simple test, cost is nothing and labor involved is nest to nothing. A clogged vent can make the fuel not flow very well.
Nicholson 500x (Project)
Nicholson 185s
Nicholson 110 (That takes an atc70 tank)
Ascott 500 head/350x (Project)
Homebuilt Racer Chromoly Suspension 110 (Ragin Runt)
PK Racing Suspension 70
A+ Inc Suspension 70
AWS Aluminum 90 frame
Hi Performance ATC Suspension frame rd350
Hi Performance ATC Suspension frame 90