I realize this subject has been discussed in the past.

As of today I have replaced 4 of 4 flexible, reinforced (wire mesh), rubber, cloth covered propane lines.

2 were the victim of *rubbing*, where the lines passed thru the frame or were attached by a form of "clamp" or "holder" ...even wire-ties can rub-thru these lines after many years of vibration.

The other 2 must have just deteriorated after 25+ years of interaction with the environment.

A $25 gas detector from Home Depot helped to locate the problems.

4 Lines:

3 Foot
5 Foot
6 Foot
16 Foot

...the propane shop reused the ends of each length at a total cost of about $200.00.

Just had my propane fired Honda EV-6010 rebuilt and now all propane systems (genny, fridge, furnaces, stove, water heater) are safely back-on-line.

Just a heads-up to inspect or preventatively replace your flexible propane lines.