JJ1400 start problem

It's been running great and starting great until now. Maybe someone has some ideas for a fix.

On start, it spools up to a registered 3500 rpm, lights on the propane, using manual propane, no solenoid, then just quits everything on the start sequence. Ignition is still on until timeout, start motor stops and rpm registers 64200 rpm.
fuel doesn't ramp. EGT probe registers. it's like it doesn't want to continue to run on the propane till the temp comes up for the fuel to ramp. maybe a fuel pump related item? which I will look at tonight. Flightworks pump
I had thought initially the EGT probe fell out but that's not the case.

got me baffled

any help would be appreciated

Mark? xairflyer?

Jack