Mobile RV LP Gas Leak Test and Safety Inspection Across Florida

By Jesse Marcer, Founder - Triton RV Repair  |  September 2026

Why LP Leak Testing Is a Life-Safety Service

Propane is heavier than air. A small leak that goes undetected will accumulate at floor level inside an enclosed coach - in the cabinet below the range, in the water heater compartment, in the rear storage bay adjacent to the furnace. The odorant added to propane is detectable by humans at concentrations well above the lower explosive limit, which means a coach can have a flammable concentration of propane at floor level before most occupants smell anything significant. Sleeping occupants, particularly those with reduced olfactory sensitivity, may not detect it at all.

Florida's RV population includes many full-timers and extended-stay guests who use propane appliances daily. Unlike a weekend camper that gets fully ventilated between uses, a full-timer's coach accumulates exposure from every small weep at every fitting. A pressure test done annually is the only reliable way to confirm the system is tight - olfactory testing alone is insufficient.

Some Florida RV parks and campgrounds now require current LP certification for coaches connecting to the site. Insurance carriers for coaches used as primary residences are beginning to request the same documentation. Our written certificate documents the test date, the test pressure held, and the technician credentials.

How the Pressure-Decay Test Works

The test begins with the tank valves closed and all appliance valves confirmed closed. We install a calibrated test gauge at the regulator outlet or at a test port in the coach LP line. The system is pressurized to 10 PSI using a hand pump or the gas supply from the closed tank. All connections and fittings are confirmed at full test pressure before the timer starts.

The system is observed for a minimum of three minutes. Any pressure drop during that window is a fail. A steady reading - within the gauge's tolerance - is a pass. If the system fails, we move to leak location using a calibrated soap solution at each fitting in the system: regulator connections, pigtail ends, the inlet fitting at the coach, each appliance shutoff valve, the flex line connections at each appliance, and the burner connections within the appliance housing.

The precision of the pressure-decay test is what makes it more reliable than soap alone. A very small leak at a flex line connection may produce bubbles too small to see in normal light at ambient pressure, but it will show up immediately as a pressure drop on a calibrated gauge. The test pressure of 10 PSI is standardized specifically because it is high enough to reveal small leaks while low enough to not damage appliance components.

What Florida Heat Does to LP Fittings and Hoses

The interior of an unventilated Florida coach in summer can exceed 140 degrees Fahrenheit. At that temperature, the rubber compound in LP flex hoses - typically EPDM or neoprene - begins to lose plasticizers and harden. Hardened hoses become brittle at the crimp fittings where they connect to brass. The first indication is usually a very small leak at the fitting end, visible as a bubble on soap test, that will grow over time.

Brass flare fittings in the LP system are also affected. The thermal differential between the coach skin and the interior fittings creates daily expansion and contraction of the metal. Over years, this work-hardens the copper tubing at bends near fittings and can cause micro-cracks. Thread sealant on NPT fittings breaks down with repeated thermal cycling and eventually allows seepage at the threads. This is why a coach that passed its LP test two years ago can fail the same test today - the system was at a different point in its thermal cycle history.

The LP detector inside the coach is a separate but related concern. Florida's heat also ages the semiconductor sensor in the detector. A detector more than five years old may not respond to propane concentrations within its stated threshold. We test the LP detector function during every leak test by exposing the detector to a known propane source and confirming it alarms within the specified response time.

Locating Leaks and Making Repairs on Site

When the pressure test reveals a leak, the next step is isolating which segment of the system contains it. We close the appliance valve for each circuit sequentially and re-test. When re-testing a segment shows the pressure holds, we have identified the circuit containing the leak. Within that circuit, soap solution at each fitting locates the specific source.

Most LP leaks in Florida coaches are at flex hose connections or at NPT thread fittings that have lost their sealant. Both are repairable at the coach without removing the appliance. Thread fittings are disassembled, cleaned, re-sealed with a pipe dope rated for LP service, and tightened. Flex hoses with leaks at the crimp are replaced - it is not practical to re-crimp a fitting in the field, and a new hose is the correct repair. After every repair, the system is re-pressurized and the full test is re-run to confirm no additional leaks were present elsewhere in the system.

A small percentage of coaches tested in Florida have multiple leak points - this is particularly common in coaches more than 15 years old with original flex hoses and never-serviced thread fittings. We quote all repairs before beginning work and let the owner decide how much to address in a single visit versus deferring lower-risk findings.

The Written Certificate and What It Documents

Every system that passes the pressure-decay test receives a written certificate documenting the date, the test pressure, the duration held, the technician name and RVIA credentials, and the coach identification. This is the document required by parks and insurance carriers. It is also your own record that establishes the baseline condition of the LP system at the time of service.

The certificate is accompanied by an inspection report that notes any findings that were not a test failure but that represent future risk - aging hoses that are still sealing but showing surface checking, fittings that are tight but have corroded threads, a regulator approaching the end of its service life. This gives you a ranked list for future maintenance rather than surprises at the next annual test.

Frequency and Timing in Florida

For coaches used year-round in Florida, annual LP testing is the appropriate interval. For coaches stored through the summer and reactivated in the fall for the snowbird season, the test should be done as part of the reactivation service. Any coach that has had LP system work - a new appliance installation, a regulator replacement, a collision repair near the LP compartment - should be tested after the work regardless of when the previous test was done.

The best time of year for LP testing in Florida is October through November, when the coach is being brought out of summer storage and before the first extended trip of the season. This timing catches any degradation that occurred during the hot summer months and gives time to address findings before extended use. A spring test in March catches any issues before the northern migration that many Florida-based owners make each year.

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