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Hopefully someone with the same set up as you sees your thread an can offer advise. I do know that over a long time the diaphragm goes slack and and the engine needs tuning. A neighbour's vehicle had...

If all the easy stuff checks out, maybe undo a hose and see that the coolant is actually flowing when the engine is first started. Could be a blockage or thermostat problem.

Trace the wires from the tank and it should join a connector at the back of the vehicle behind the tank or bit further up towards the front of the vehicle from bottom.
I posted below links to my...

commonly the petrol pump will still pump, be it recycling the fuel, and only the injectors stop working. (for some gas systems)
you might try to find the wires at a connection before the tank to...

It would depend on the way the switch is installed in your system.
If it's an auto switch that starts on petrol and run for couple of minutes before it switches to LPG, then it may not that simple ...

No sorry, mine was changed to aftermarket years ago.

Funny this is that everything I saw had those pieces still attached to the hub when you pulled it off as well .

But I just rebuilt my swivel hubs the other day and when I pulled my hubs off I had...