hi guys purchased my first 100 series 2 months and it has a 1fz-fe motor my problem is it has an intermittent fuel leak from the top of the fuel pressure regulator(the one closest to firewall on injector rail) where the little screw goes in the top. i have replaced the regulator when i first noticed the leak but it clearly wasnt the problem. the car is also running lpg (propane). i have removed the fuel solenoid as i thought maybe it was faulty and creating back pressure. i need help guys as i can not run my car on petrol any suggestions are greatly appreciated.