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Old 05-22-2011, 12:25 PM   #1
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Default Auto Stop Valve - Propane

If you have an older propane tank it might have an Auto Stop valve. The Auto Stop is no longer made. It uses a piston rather than a float to prevent overfilling the propane tank. The vent valve must be fully opened in order to fill the tank. If the vent valve is only partially open then the overfill protection will kick in and prevent you from filling the tank.

Notes: The reset button (to activate piston) cannot be pressed down unless the Vent valve is open.

It is functional but propane filling attendants might not know how it works.

Auto Stop valve filling instructions copied from the label:

This tank is equipped with an Auto Stop valve.
80% Automatic Stop Fill Valve Operation Instruction:
1. Make sure the vent is closed.
2. Connect hose to acme thread.
3. Turn on pump.
4. Open vent to start filling.
CAUTION! If filling rate is slow, or is not filling, press the opposite end of vent stem to activate piston. Filling should start immediately.
5. Vapor will discharge similar to standard vent valve.
6. When liquid appears, filling stops. Close vent stem.
7. Stop pump.
8. Place acme cap on valve
Auto Stop Corp
Lynwood, CA

You can purchase a Fill valve and a separate Bleeder valve to replace the Auto Stop valve. This will make the fill system the same as modern RV's. I think I have found high quality replacements. Cost is $30 or so for the parts. I will post the details once I speak to the company to confirm.

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File Type: jpg auto stop valve.jpg (121.7 KB, 2747 views)
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Old 05-23-2011, 03:24 PM   #2
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Default Re: Auto Stop Valve - Propane

These are parts I ordered from PNG Technologies.

http://www.pngtechnologies.com/LPG-T...CESSORIES.html

Quick Fill Valve
Part # 7647SC
3/4" NPT
$ 16.99



80% Stop Bleeder
Part # 3165CP
Vavle - No Stem, 1/4" NPT



Obviously don't work on your propane system unless you absolutely know what your are doing. The tank has to be completely empty of propane. The vendor recommended using Teflon paste pipe dope rather than Teflon tape.

I'll update this thread again when I install them.
Attached Images
File Type: jpg fill valve.jpg (4.2 KB, 2742 views)
File Type: jpg bleeder or spit valve.jpg (3.2 KB, 2740 views)
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Old 07-18-2011, 06:27 PM   #3
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Default Re: Auto Stop Valve - Propane

Somehow my order at PNG got lost before being processed so I had to order these parts again today.
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Old 07-19-2011, 03:28 AM   #4
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Default Re: Auto Stop Valve - Propane

Re: MarcoPolo's auto fill replacement. When I approached a propane shop here in Alberta, he said several things:
1. Although tanks need to be inspected every 7 years (in AB), no shop is in the business of checking RV propane tanks. So the matter rests until the sh** hits the fan on a preventable accident.
2. If, however, the shop replaces the fill valve, then the shop will inspect the tank very carefully, including rust etc etc etc.
The message he was conveying was: In Alberta, leave it alone!
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Old 09-02-2011, 07:54 PM   #5
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Default Re: Auto Stop Valve - Propane

If it ain't broke don't fix it

I had the tank filled recently. I'm glad I had the instructions and had read up on this type of valve. The attendant tried filling the tank for 5 minutes before telling me that my gauge probably didn't work and the tank must be full because only a small amount of propane went in. Like $2 worth. He had never seen an Auto Stop valve.

He was patient though and when I asked him to make sure the vent was fully open and try again he did and it took $25 + of propane!

So for now I'll keep the Auto Stop valve because it works. I did finally receive the new modern type fill valve and bleeder valve that I ordered so I'm ready to replace it all if necessary.
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