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Old 11-10-2014, 12:36 AM   #1
onemanvan
 
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Default LP generator hose leak + Propane Testing Info

I ran this leak down test:

1) Turn on LP at tank
2) Let system pressurize
3) Turn off LP at tank
4) Wait 24 hours
5) Turn on one of the stove burners
6) Confirm gas hisses for 30 seconds or more...

Mine did not pass this test - no hiss at all...
I used an Inficon Gas-Mate to trace down the problem.
I isolated the problem to the 'Rubber LP generator hose'.
Where the hose meets the generator it bends 90 degrees in the space of a few inches!
I believe this was too much stress for the rubber itself and/or the brass-rubber connection.
At any rate - where the rubber meets the brass there was a leak!
I removed the hose - capped off the line - and I'm running another 24 hour test...
I'll replace the hose and try to squeeze in a 90 degree brass elbow to relieve the stress.
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Old 11-10-2014, 05:18 PM   #2
MrTomacco
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Default Re: Rubber LP generator hose leak

Are the gas detectors typically available for rent somewhere or are they cheap enough to buy?

Rob
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Old 11-10-2014, 06:17 PM   #3
onemanvan
 
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Default Re: Rubber LP generator hose leak

They cost about $200 - I'm not aware of any place that rents them... I happen to have one because in one of my previous lives I was an RV repair technician... I'm just an old retired codger now:-)

BTW: I re-ran the 24 hour leak down test with the genset line capped off at the tee and it passed the test with flying colors! Stove burner stayed lit for over 4 minutes on residual pressure! That confirms I'm on the right track and there aren't any leaks in the lines that Westfalia expertly installed!

One other note: I also found a leak at the test port on the carburetor - tightened down the plug and stopped that leak as well...

Last edited by onemanvan; 11-10-2014 at 06:29 PM.
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Old 11-11-2014, 02:29 PM   #4
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Default Re: Rubber LP generator hose leak

can i borrow your gas detector? :)
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Old 11-11-2014, 04:13 PM   #5
onemanvan
 
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Default Re: Rubber LP generator hose leak

If your'e ever in Benson Arizona feel free to look me up and I'll share with you whatever you need!
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Old 11-11-2014, 10:45 PM   #6
onemanvan
 
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Default Re: Rubber LP generator hose leak

I couldn't squeeze a 90 degree brass elbow into this space, so...
I made a 90 degree elbow out of 3/8 soft copper tubing and installed a new hose.
Test ran the generator - checked for leaks - started another 24 hour leak down test...
Yes, you can borrow my copper tubing bending and flaring tools too :-)
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Last edited by onemanvan; 11-11-2014 at 11:12 PM.
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Old 11-12-2014, 03:09 PM   #7
onemanvan
 
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Default Re: Rubber LP generator hose leak

My propane system now passes the leak down test!
Replacing and re-routing the hose to the generator fixed the problem.

Footnote:

To further illustrate the incompetence of the Airstream upfitters/installers.
I found teflon tape on the flare fittings they used...

Copper Handbook

"No material (e.g., pipe joint
compound) should be applied to the
mating surfaces of the flare fitting and
the flared tube end before attaching the
flare nut to the fitting body."

Page 53 - Copper Tube Handbook, put out by the Copper Development Assn. http://www.copper.org/publications/p...e_handbook.pdf

Last edited by onemanvan; 11-12-2014 at 04:16 PM.
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Old 11-12-2014, 06:17 PM   #8
OldWest
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Default Re: Rubber LP generator hose leak

Thanks.

Also, someone posted awhile ago to check the routing of the propane line above the driveshaft. In that case, the propane line was not properly secured and was dangling and rubbing on top of the driveshaft. A circular line on the driveshaft could be seen where the propane line was touching the driveshaft. .
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Old 11-12-2014, 06:24 PM   #9
OldWest
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Default Re: Rubber LP generator hose leak

Not related.

In the photo above to the right, you can see the gray water valve by Valterra--the square and the square bracket. You can see that a cable is in the middle of the large open square bracket area. After taking proper precautions like jackstands, you can spray some silicon lubricant where the cable runs through the square bracket opening. If you can't see, just spray everything. Had a gray water tank leak from the hose and finally figured out that the gray water valve wasn't closing because of a binding cable. Spraying thus area and the gray water tank valve handle area solved the problem.
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Old 11-13-2014, 12:11 PM   #10
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Default

Tested ours and it failed the test. Will look into the generator feed
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