Just bought 164 with LPG

[Audrey Old]

Comment invited on my latest purchase - an early 164 fitted with an LPG conversion about 11 years old.
On the report for work done when MoTd last September the garage said the carbs were shot, so I replaced them, but it still wouldn't run on LPG. In January the LPG system was serviced by a local and recommended LPG company, who said it was bunged-up due lack of servicing.
All was fine until returning from the Beaulieu show, when it spluttered on both LPG and petrol and gave out at the roadside, so I rang for a tow for the last 5 miles and had a look at things the next day. As I thought, a total fuel flow failure, so I bypassed the LPG change-over valve and put in a direct fuel pipe from the mechanical pump to the carbs, and it has been fine ever since.
Conclusion - a fault in the change-over valve as nowt on either fuel.
However, my question: am I wrong but is it a bad design to have the original petrol pump straining away at trying to pump petrol to a gate-valve which has shut off petrol for the selected LPG? Surely the original kit should have included an electric pump which could be switched over when required.
Strikes me as bad practice, as does the lack of gas contents gauge in the car - I wasn't going to get out whilst on the motorway, open the boot and check a gauge in there, even if I'd had a torch!
Other than junk the LPG system complete, I'd be interested in ALL comments (serious AND accusing) on my thoughts. If needed I'll look for more details of the installation amongst the wealth of papers that came with the car.

Paul

[classicswede]

The shut off valve is correct. If you think about it when the floats are full the pump is pumping away just the same with nowhere for the fuel to go.

The petrol solenoid should have an override lever on it in case of switch failure.

If you have a mechanical gauge in the boot then by changing the switch to a compatible one you can use an electronic sender.

The best fuel gauge is your trip meter.