Good Sam Club Open Roads Forum: General RVing Issues: Cause and effect?
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 > Cause and effect?

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Cummins12V98

on the road

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Posted: 11/29/21 07:22pm Link  |  Quote  |  Print  |  Notify Moderator

Stopped bu SunBird RV in Indio, CA. Talked to the new owner explained what was happening with the new hose without the check valve. He reached down right by the cash register and said this is what you need!

I screwed the new check onto the new hose then removed the brass fitting in the change over valve. Applied yellow teflon paste to the threads and screwed the new assembly into the change over. Hooked up the "NEW" side opened that tank and closed the old side. Fired off the gen and guess what??? The darn gen stayed running. So much for "The check valve is not needed".

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* This post was edited 11/29/21 07:30pm by Cummins12V98 *


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larry barnhart

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Posted: 11/29/21 07:29pm Link  |  Quote  |  Print  |  Notify Moderator

Great story. Nice to have a quality knowledgeable owner. chevman


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MFL

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Posted: 11/30/21 08:33am Link  |  Quote  |  Print  |  Notify Moderator

Thanks for letting us know that the problem has been solved. Great follow up, including pics!

I suspected that the valve was needed, even though propane guy (that should know) said not. Now we all know it is.

Jerry





blofgren

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Posted: 11/30/21 09:25pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the follow up. I still don't understand why the automatic changeover valve would not prevent propane from flowing from one tank to the other though. [emoticon]


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Bobbo

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Posted: 12/01/21 07:31am Link  |  Quote  |  Print  |  Notify Moderator

I am not convinced the backflow preventer did anything. It still sounds to me like the high flow shutoff kicked in. Maybe the backflow preventer restricts the propane flow just enough to keep that from happening. My system works just fine with 2 pigtails without backflow preventers. I installed them early this past summer when my two pigtails started leaking propane.

blofgren wrote:

Thanks for the follow up. I still don't understand why the automatic changeover valve would not prevent propane from flowing from one tank to the other though. [emoticon]

If the auto-changeover regulator let both tanks connect to each other, it would draw down both tanks at the same time rather than let one tank run dry, then switch over to the second.


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Cummins12V98

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Posted: 12/01/21 09:35am Link  |  Quote  |  Print  |  Notify Moderator

blofgren wrote:

Thanks for the follow up. I still don't understand why the automatic changeover valve would not prevent propane from flowing from one tank to the other though. [emoticon]


Bottom line I need a check for my gen to run.

My transfer switch works as it should.

Lantley

Ellicott City, Maryland

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Posted: 12/01/21 10:17am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

blofgren wrote:

Thanks for the follow up. I still don't understand why the automatic changeover valve would not prevent propane from flowing from one tank to the other though. [emoticon]

.

That was my point a few post ago. The check valve ensures no back pressure because gas can only flow one way. Otherwise there is back pressure which ultimately reduces flow.
The notion that the changeover valve controls the reverse flow is incorrect.


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