How to Run 2 Propane Tanks Together? Complete Guide to Dual Propane Tank Setup for RVs and Grills

Everything You Need to Know About Connecting Two Propane Tanks Together-Dual Tank Systems, Auto-Changeover Regulators, Manual vs Automatic Switching, Installation Guide, Safety Considerations, and Best Practices for Extended Propane Supply

Introduction: Double Your Propane, Double Your Peace of Mind

Running out of propane is one of the most frustrating experiences for RV owners and grilling enthusiasts. Whether you're on a long camping trip or hosting a backyard barbecue, having a dual propane tank system ensures you never run out unexpectedly. Learning how to run 2 propane tanks together is a game-changer that provides extended runtime, convenience, and peace of mind.

Why run 2 propane tanks together:

⏱️ Extended Runtime - Double your propane supply

🔄 Automatic Switchover - Never interrupt cooking or heating

🛡️ Backup Supply - Always have reserve tank

💰 Cost Efficiency - Buy propane in bulk, refill less often

🚐 Essential for RVs - Critical for heating, cooking, hot water

🍖 Perfect for Grilling - Long smoking sessions without worry

📋 Convenience - Less frequent refills and tank swaps

This comprehensive guide covers:

What is a dual propane tank system

Types of dual tank setups

Auto-changeover vs manual switching

How to install dual tank system

Required components and tools

Step-by-step installation guide

Safety considerations

Troubleshooting common issues

Best practices

Frequently asked questions

Part 1: Understanding Dual Propane Tank Systems

What Is a Dual Propane Tank System?

A dual propane tank system connects two propane tanks to a single regulator, allowing you to:

Draw from both tanks simultaneously (rare, requires special setup)

Use one tank at a time with automatic switchover (most common)

Manually switch between tanks (budget option)

Benefits of Running 2 Tanks Together

1. Extended Propane Supply:

Single 30 lb tank: ~7.1 gallons

Dual 30 lb tanks: ~14.2 gallons

Single 40 lb tank: ~9.5 gallons

Dual 40 lb tanks: ~19 gallons

Result: 2x the runtime, half the refills

2. Automatic Backup:

Never run out unexpectedly

Automatic switchover (with auto-changeover regulator)

Continuous supply without interruption

3. Convenience:

Refill one tank while using the other

Less frequent propane station visits

Perfect for long trips or extended use

4. Safety:

Always have backup tank

Reduce risk of running out in cold weather

Never stranded without heat

Common Applications

RVs and Trailers:

Travel trailers

Fifth wheels

Motorhomes

Truck campers

Essential for heating, cooking, hot water, refrigerator

Residential:

Home heating backup

Generators

Outdoor kitchens

Commercial:

Food trucks

Catering operations

Outdoor events

Grilling and Smoking:

Long smoking sessions (12+ hours)

Large gatherings

Commercial grilling

Part 2: Types of Dual Propane Tank Setups

Setup Type 1: Automatic Changeover System (Recommended)

What It Is: A specialized regulator that automatically switches from empty tank to full tank without manual intervention.

How It Works:

Connect both tanks to regulator

Open both tank valves

Regulator draws from primary tank first

When primary tank empties, regulator automatically switches to reserve tank

Indicator shows when tank is empty

Pros:

✅ Fully automatic

✅ No interruption in service

✅ Visual indicator shows tank status

✅ Most convenient option

✅ Never forget to switch tanks

Cons:

❌ Higher cost ($50-100 for regulator)

❌ More complex installation

❌ Requires specific regulator type

Cost: $50-100 for auto-changeover regulator + $20-40 for hoses

Setup Type 2: Manual Changeover System

What It Is: Two tanks connected via a T-fitting or dual regulator with manual valve switching.

How It Works:

Connect both tanks to regulator

Open one tank valve (close other)

When first tank empties, manually close its valve

Open second tank valve

Continue operation

Pros:

✅ Lower cost ($20-50 total)

✅ Simple installation

✅ No special regulator needed

✅ Good for infrequent use

Cons:

❌ Requires manual switching

❌ Can forget to switch tanks

❌ May have brief interruption when switching

❌ Need to monitor tank levels closely

Cost: $20-50 for hoses and fittings

Setup Type 3: Parallel Flow System (Both Tanks Simultaneously)

What It Is: Both tanks feed into system at same time, drawing equally from both.

How It Works:

Both tanks connected via manifold

System draws from both tanks simultaneously

Tanks empty at same rate

Pros:

✅ Balanced tank usage

✅ Lower pressure per tank

Cons:

❌ Both tanks empty together

❌ No backup when both empty

❌ Requires both tanks to be full for optimal performance

❌ Not recommended for most applications

Recommendation: NOT recommended for RV or typical use

Part 3: Required Components for Dual Tank Setup

Components List

For Automatic Changeover System:

For Manual Changeover System:

Recommended Auto-Changeover Regulators

Popular Models:

Marshall Excelsior MEGR-2535 Auto-Changeover Regulator

Price: $60-80

Flow rate: 345,000 BTU/hr

Popular for RVs

Reliable performance

Camco 59133 Automatic Changeover Regulator

Price: $50-70

Flow rate: 160,000 BTU/hr

Easy installation

Good for smaller setups

Fairview 53N84-1 Automatic Switchover

Price: $70-90

High flow rate

Commercial grade

Durable construction

Tools Needed

For Installation:

Adjustable wrench (or propane fittings wrench)

Pipe thread sealant (propane-rated)

Leak detector solution (or soapy water)

Spray bottle (for leak testing)

Safety glasses

Work gloves

Part 4: Step-by-Step Installation Guide

Installing Automatic Changeover System

Time Required: 30-60 minutes

Skill Level: Intermediate (or hire professional)

⚠️ SAFETY FIRST:

Work in well-ventilated area

No open flames or sparks nearby

Turn off all appliances

Close both tank valves

Have leak detector ready

Step 1: Prepare the Area:

Park RV on level ground

Turn off all propane appliances

Close valves on both propane tanks

Allow appliances to cool if recently used

Step 2: Remove Existing Regulator:

Locate current regulator

Disconnect from propane tank(s)

Disconnect from appliance supply line

Remove mounting hardware

Save mounting brackets if reusing

Step 3: Mount Auto-Changeover Regulator:

Position regulator near propane tanks

Mount to RV frame or dedicated bracket

Ensure regulator is level

Face indicator where visible

Secure with mounting hardware

Mounting Tips:

Regulator should be higher than tank connections

Allow space for hoses

Indicator should be easily visible

Protect from road debris (under RV)

Step 4: Connect Hoses from Tanks to Regulator:

Connect hose from Tank 1 to regulator's "Primary" port

Connect hose from Tank 2 to regulator's "Reserve" port

Hand-tighten first, then wrench-tighten (1/4 to 1/2 turn)

Do NOT overtighten (can damage fittings)

Important:

Ensure hoses are not kinked

Route hoses away from sharp edges

Use hose protectors if needed

Leave slack for tank removal

Step 5: Connect Supply Line to Appliances:

Connect outlet from regulator to RV supply line

Use appropriate fittings (usually 3/8" flare)

Tighten securely

Support piping/hose

Step 6: Check for Leaks:

Close both tank valves

Open one tank valve slowly

Apply leak detector solution (or soapy water) to ALL connections

Watch for bubbles (indicates leak)

If leak found, close valve, tighten connection, retest

Leak Testing Checklist:

Tank-to-hose connections (both tanks)

Hose-to-regulator connections (both sides)

Regulator outlet connection

All fittings and adapters

Wait 5-10 minutes, recheck

Step 7: Test the System:

Open both tank valves

Light a stove burner or other appliance

Verify flame is strong and steady

Check regulator indicator (should show green or "full")

Step 8: Test Auto-Changeover:

Close primary tank valve

Burner should continue operating

Indicator should show red or "empty"

System switched to reserve tank

Open primary tank valve again

Close reserve tank valve

Burner should continue operating

System switched back to primary

✅ System is working correctly!

Installing Manual Changeover System

Time Required: 15-30 minutes

Skill Level: Beginner

Step 1: Prepare and Disconnect:

Close both tank valves

Turn off appliances

Disconnect existing regulator

Step 2: Install T-Fitting and Hoses:

Connect T-fitting to existing regulator inlet

Connect hoses from each tank to T-fitting

Tighten all connections

Step 3: Add Ball Valves (Optional but Recommended):

Install ball valve on each hose near tank

Allows isolation of each tank

Easier manual switching

Step 4: Check for Leaks:

Same process as auto-changeover

Test all connections with leak detector

Step 5: Test Operation:

Open one tank valve

Light appliance, verify operation

Close first tank, open second

Verify continuous operation

Part 5: How to Use Dual Propane Tank System

For Automatic Changeover System

Normal Operation:

Open BOTH tank valves

Regulator automatically selects primary tank

Use appliances normally

When primary tank empties, system auto-switches to reserve

Indicator shows which tank is in use

Refill empty tank at earliest convenience

Close empty tank valve, refill, reopen

Monitoring Tank Levels:

Watch indicator on regulator

Green = Primary tank has propane

Red = Primary tank empty, using reserve

Refill empty tank immediately

Best Practice:

Check indicator regularly

Refill empty tank right away

Never let both tanks get low

Keep both tanks at least 25%+ full

For Manual Changeover System

Operation Steps:

Open PRIMARY tank valve (Tank 1)

Close RESERVE tank valve (Tank 2)

Use appliances normally

When Tank 1 empties (watch for signs):

Weak flame

Appliances not working

Close Tank 1 valve

Open Tank 2 valve

Continue operation

Refill Tank 1 at earliest opportunity

Tips for Manual Systems:

Check propane levels regularly

Use propane tank gauge or monitor

Keep track of which tank is in use

Don't wait until both tanks empty

Refill immediately when tank empties

Part 6: Safety Considerations

Critical Safety Rules

⚠️ ALWAYS:

✅ Check for leaks after ANY connection work

✅ Use propane-rated sealant on threaded connections

✅ Keep tanks upright and secure

✅ Store tanks in ventilated area

✅ Close tank valves when not in use

✅ Have propane detector in RV

✅ Inspect hoses regularly for cracks or wear

✅ Replace hoses every 3-5 years

⚠️ NEVER:

❌ Use matches or lighters to check for leaks

❌ Overtighten fittings

❌ Use damaged or corroded tanks

❌ Store tanks in enclosed spaces

❌ Smoke near propane tanks

❌ Use non-propane-rated fittings or hoses

❌ Modify regulator (use as manufactured)

Leak Detection

Signs of Propane Leak:

Strong propane odor (rotten egg smell)

Hissing sound near connections

Bubbles when leak detector applied

Dead vegetation near tank

Flame that won't stay lit

If You Detect a Leak:

Do NOT panic

Close tank valves immediately

Extinguish any flames

Ventilate area

Find and fix leak

Retest before using

Emergency:

If strong smell or major leak

Leave area immediately

Call fire department

Do NOT use electronics or switches

Propane Hose Inspection

Check Hoses Every 6 Months:

Cracks or splits

Bulging or swelling

Stiffness or brittleness

Corrosion on fittings

Signs of wear from rubbing

Replace Hoses:

Every 3-5 years (even if look good)

Immediately if any damage found

After any accident or impact

Part 7: Troubleshooting Common Issues

Problem 1: System Not Switching Automatically

Symptoms:

Burner goes out when primary tank empties

No automatic switchover

Possible Causes:

Regulator malfunction

Reserve tank valve closed

Blockage in reserve line

Regulator not properly installed

Solutions:

Verify both tank valves are OPEN

Check for kinked or blocked hoses

Test regulator manually (close primary, should switch)

Replace regulator if faulty

Problem 2: Leak at Connection

Symptoms:

Propane smell

Bubbles when leak testing

Hissing sound

Possible Causes:

Loose connection

Damaged fitting or hose

Missing or worn O-ring

Cross-threaded connection

Solutions:

Close tank valve

Disconnect and inspect

Replace damaged components

Reconnect and tighten properly

Retest with leak detector

Problem 3: Weak Flame or Low Pressure

Symptoms:

Weak burner flame

Appliances not performing well

Low heat output

Possible Causes:

Regulator failing

Both tanks low or empty

Blockage in line

Incorrect regulator for appliance needs

Solutions:

Check both tank levels

Verify regulator flow rating

Inspect for blockages

Replace regulator if needed

Problem 4: Indicator Not Working

Symptoms:

Indicator doesn't change when tank empties

Indicator stuck in one position

Possible Causes:

Indicator mechanism broken

Regulator internal failure

Debris in indicator

Solutions:

Test by closing primary tank valve

If system switches but indicator stuck, replace regulator

Verify tanks have propane

Part 8: Best Practices for Dual Tank Systems

Maintenance Tips

Monthly:

Check for leaks (quick visual)

Inspect hoses for damage

Verify tank connections tight

Test appliances

Seasonally:

Full leak test all connections

Inspect regulator

Check tank condition

Replace any worn components

Annually:

Professional inspection (recommended)

Replace hoses if 3-5 years old

Check tank expiration dates

Update emergency procedures

Usage Best Practices

1. Keep Both Tanks 25%+ Full:

Never let both tanks get low

Refill at 25-30%

Always have reserve

2. Refill Empty Tank Immediately:

Don't wait until both empty

Refill right after tank empties

Rotate tank usage

3. Monitor Tank Levels:

Install propane tank monitors

Check indicator regularly

Use smartphone app if available

4. Carry Extra Propane:

Small 1 lb canister for emergencies

Backup for critical situations

5. Know Your Usage:

Track propane consumption

Plan for trips accordingly

Adjust for weather conditions

Part 9: Frequently Asked Questions

Q1: How do I run 2 propane tanks together?

A: Connect both tanks to an auto-changeover regulator:

Mount auto-changeover regulator

Connect hoses from each tank to regulator

Connect regulator outlet to supply line

Open both tank valves

System automatically draws from primary tank

When primary empties, auto-switches to reserve

For manual system: Use T-fitting with ball valves on each tank line, manually open/close valves to switch tanks.

Q2: What's the difference between auto-changeover and manual switching?

A:

Recommendation: Auto-changeover for RVs and regular use; manual for budget setups.

Q3: Can I run both propane tanks at the same time?

A: Not recommended for most applications. Parallel flow systems (both tanks simultaneously):

Empty both tanks at same time

No backup when both empty

Harder to manage

Better approach: Use auto-changeover to draw from one tank at a time, with automatic backup.

Q4: How do I know when to refill propane tanks?

A: Monitor tank levels:

Auto-changeover indicator: Red = primary empty

Propane tank gauges: Show approximate level

Smart monitors: Exact percentage on smartphone

Weigh tanks: Most accurate free method

Hot water method: Quick visual check

Refill when: Tank reaches 25-30% (or immediately when indicator shows empty).

Q5: Do I need a special regulator for dual tanks?

A: Yes, for automatic switching. You need:

Auto-changeover regulator for automatic switching

Dual-port regulator OR standard regulator with T-fitting for manual switching

Single-stage vs Two-stage:

Single-stage: Simpler, lower cost

Two-stage: More stable pressure, better for RVs

Recommendation: Two-stage auto-changeover regulator for RVs.

Q6: How much does it cost to set up dual propane tanks?

A:

DIY saves money but requires skills. Professional installation recommended if unsure.

Q7: Can I use different size tanks together?

A: Yes, but not recommended. Different size tanks create issues:

Unequal usage rates

Confusing fuel management

Harder to track levels

Best practice: Use two identical tanks (two 30 lb or two 40 lb).

If using different sizes: Monitor levels closely, understand smaller tank will empty first.

Q8: How long will dual propane tanks last in an RV?

A: Depends on usage and tank size:

Dual 30 lb tanks (14.2 gallons total):

Winter (heavy heating): 4-7 days

Mild weather: 10-14 days

Summer (minimal heating): 14-21 days

Dual 40 lb tanks (19 gallons total):

Winter (heavy heating): 5-10 days

Mild weather: 14-21 days

Summer (minimal heating): 21-28 days

Track your usage to get accurate estimates for your situation.

Q9: Is it safe to leave both tank valves open?

A: Yes, with auto-changeover regulator:

Designed for both valves open

Regulator manages tank selection

Safe and recommended operation

With manual system:

Only ONE valve open at a time

Prevents both tanks emptying together

Requires active management

Q10: What if my auto-changeover regulator fails?

A: Troubleshooting steps:

Verify both tank valves are OPEN

Check for kinked or blocked hoses

Test by closing primary tank valve manually

Listen/look for switch to reserve tank

If doesn't switch, regulator may be faulty

If regulator fails:

Can manually bypass (close empty tank, open reserve)

Replace regulator as soon as possible

Contact manufacturer if under warranty

Carry backup regulator for extended trips.

Conclusion: Mastering Dual Propane Tank Systems

Running 2 propane tanks together is one of the best upgrades you can make for your RV or grilling setup.

Key Takeaways:

Dual tanks double your propane supply - Extended runtime, less refills

Auto-changeover is recommended - Automatic switching, no interruption ($90-175)

Manual changeover is budget-friendly - $50-105, but requires active management

Installation is DIY-friendly - 30-60 minutes for auto-changeover

Safety is paramount - Always leak test, never use matches to check leaks

Maintain your system - Regular inspections, replace hoses every 3-5 years

Monitor tank levels - Use gauges or smart monitors, refill at 25-30%

Keep both tanks 25%+ full - Never let both tanks get low

Know your usage - Track consumption for better planning

Have backup plan - Extra propane, spare regulator, manual bypass knowledge

The bottom line: A properly installed dual propane tank system provides peace of mind, convenience, and reliability. Whether you choose automatic or manual switching, the investment pays off in never running out of propane unexpectedly.**

Last Updated: July 2026

Complete Guide: How to Run 2 Propane Tanks Together?

Disclaimer: Propane is flammable and requires careful handling. If you're unsure about installation, hire a licensed professional. Always follow manufacturer instructions and local codes. If you smell propane strongly, leave the area and call emergency services.