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My TB42e just doesn't like running on petrol. It runs GREAT on LPG but as soon as I switch over to petrol it dies. I bought it like that recently so not much history I can add.
My LPG system starts on petrol and that seems to work fine. It just doesn't seem to have any power and is very rough at anything other than idle. Feels like it's starving for fuel, but I'm not really sure on that one. If I'm goin slow in 1st gear and push my foot right down it seems to run a bit smoother but still gutless and rough.
My maxmium speed is about 60km/hr on petrol.
I think it might possibly be the fuel pressure regulator or the pump or maybe the filter? Is there an easy way to test them without a fuel pressure guage?