Posted by peter r on February 10, 2008, 12:14 am
203.54.74.6

Hi all 85 BA duel fuel IMPCO system Twin carb Twin Mixers Twin tanks . This is not from cold , it has to be primed to start from cold , the problem occurs when it is warmed and also often when air temp is higher , it`s intermittant and ongoing for a couple of years . Every now and again but not of late and even in the heat , the car won`t start on LPG . It generally fires once and won`t start when it occurs . Similar to when a rotor is playing up . Other times it will it will run for 5/10 sec and stop and not restart . Then other times it`s dead as a door nail , winds but won`t start . It`s only ever happened twice after refueling . The norm is the key is barely turned and it fires , just sort of flicked on and it fires , there is nothing wrong with the start system . I can find no faults with the lpg system or electrics related other than the way i can start it when the problem occurs . The way it can be started is by disconecting the solenoid wires and jumping a power wire to the main fuel line solenoid at the converter . If i do this it will wind over for around 5 seconds before it will start but it will always start . If i don`t do this it can be wound over for as long as you feel like , it can be left and gone back to for 10/15/30 minutes and it may or may not start . The way this part of it works is similar to an EFI fuel pump , there is a computer , it`s not the normal type saftey switch ( well it`s called a computer don`t know what`s in it )under the dash so what i`m doing is like jumping a power wire to an EFI fuel pump . Sorry about the length but it`s a bit hard to explain otherwise . Any ideas ? Cheers , Peter