Oddly, my factory Bi-fuel still burns Petrol

[CNGBiFuel]

More info on this. In truth my relay to drop the pump relay solution did not really work. This was becaue on alter inspection the pressure in the system is kept and the system does not let the prssure drain abck to the tank but has it maintaitned.

If I press the scrhader valve on my fuel rail with the engine off a fair old squirt of fuel ( I estimate half a cup) is dispensed before pressure is lost. So I have to burn that off before my solution works which is kinda self-defeating. Spec it appears is 40-50psi and that bleeds off slowly, not quickly as I had imagined.

I also found on my car anyway the vaunted 206 relay to control the gas shut-off valve is not there in the 201 >> 215 relays fuse box. Also the RHD is differnet to the LHD version in numbering. By htis fuse box I mean that on the drivers side of the bulkhead. (B of thing to find and get to ) and attaached thru' the bulkhead as part of the same one you can get at under the bonnet, with the number 100>>108 etc relays. I was going ot use the 206 socket to take my supply for my timer relay. In the finish I never did find the relay that controls the shut-ooffsolenoid, so wired the timer relay in parrallel to the cut-off solenoid

So unless I run yet another timer relay to reverse the pump polarity to run it backwards (and it even sounds too stupid) my idea has failed.

My other idea is a solenoid operated fuel line valve to drain it off, but where do you take the fule off safely aside from a line right back to the tank. As it happens soem injection systems have to blow-dwon excess pressure line doing exactly that, a return to the tank, but sadly not htsi one.