This is a verbatim copy of the email I've sent to Primus support (haven't heard from them yet), maybe someone here would be able to help?..
I’ve just bought an Omnilite TI but can’t understand how to prime it with 0.25 jets (for heavier fuels). It works perfectly with other jets. The fuel just won’t flow, even though the bottle is pressurised and the system is clean (it’s a new stove). If I put the stove to its side, I can have a few drops of kerosene, but not enough for priming. As soon as I replace the jet to 0.32, kerosene starts flowing profusely. Or, if I unscrew the 0.25 jet, the fuel is flowing through it, but not if it’s screwed down. If I pour fuel manually from a bottle, burn it and prime the stove, then 0.25 jet works perfectly with kerosene. The problem is with getting the fuel flow BEFORE the system is hot. I have even tried replacing that 0.25 jet with a new one from the service kit but it still won’t work.
To sum it up:
- 0.36 jet with gas - OK
- 0.32 jet with any kind of fuel - OK
- 0.25 jet with any kind of fuel (kerosene, white gas) - fuel won’t flow for priming (20-30 pump strokes, almost full bottle). When the system is hot, fuel will vaporise and burn, but not before.
I’m testing it in perfect conditions, with no wind and on a warm sunny day.
Any ideas or advices? Am I doing something wrong?..