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repipeslo, Plumber
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Experience:  10+ years experiance in the pipe industries.
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Slight gas smell in cabinet under kitchen cooktop.

Customer Question

A few months ago I noticed a slight smell of gas in the cabinet under a 10 yr old gas cooktop(Kitchenaid). Used soapwater to test for leaks on all gas block valve, fitting, hose, and regulator under cooktop in cabinet. No leaks. No leaks at valves on cooktop itself.
A month ago bought and installed new cooktop (Dacor) with new gas flex hose and new regulator that came with new cooktop. Yellow Teflon tape on all pipe fittings. Soapwater checked block valve, fitting, hose, regulator – no leaks and no gas smell. Last night again noticed a slight gas smell when you open cabinet – 1 month after install. Soapwater test again – no leaks. Went years with no gas smell then with new cooktop 1 month and slight gas smell returns. Any ideas?
Submitted: 6 years ago.
Category: Plumbing
Expert:  repipeslo replied 6 years ago.
You could have busted loose the elbow in the wall or the stem feeding it. On the flex lines they usually state if they do require teflon usually not on the yellow or galvanized ones or yellow ones do they require teflon that is a dry fitted seal. But like you said you check it with soapy water. Is this house on a slab or have a basement or void underneath the floor?
Expert:  repipeslo replied 6 years ago.

Do you know were the feed is coming from to the range?

Customer: replied 6 years ago.
Reply to repipeslo's Post: The teflon is only on the pipe NPT thread not the metal to metal seats. I used to do instrumentation work offshore in my younger days and did tons of work with stainless steel tubing and compression fitting and some flare so I feel confident that that part is right. The black pipe comes up through the floor in the basement. When I worked offshore all of the instrument air was natural gas and at compression stations the gas would accumulate at the floor -but it was unprocessed gas. So where you are going with this I think is to check the pipe in the basement?
Expert:  repipeslo replied 6 years ago.
correct..it is a possibility that you may have sprung a leak uncommon but a possibility. How old is the house? any water damage to the house in that area to cause rust? Did you replace the ball valve on the flexline?
Customer: replied 6 years ago.
Gas supply from basement -no leaks at 90 turning up to cabinetgraphic
Expert:  repipeslo replied 6 years ago.
did you smell the odor down in the basement or no?
Expert:  repipeslo replied 6 years ago.
are you able to get me a really close up picutre on the threads at the valve and the 90?
Customer: replied 6 years ago.
Reply to repipeslo's Post: Ball valve not replaced. It is original. House built around 1994 or 1995. We are first owners.
No gas smell in basement. No smell in cabinet today but could smell yesterday. Taking the time to recheck the lines with soap water may leave cabinet open long enough to dissipate smell. I put a lot of soap water on the valve thinking that maybe leak around the stem. Valve has not been turned off until replacement one month ago. Do you think I should replace valve anyway even with no leakage?
Expert:  repipeslo replied 6 years ago.
They way I was taught to do it is when you change/replace the flex line you replace the valve I never asked why I just did even if it was a brand new valve. Since the fittings are dry its just a soft preassure type of seal. I would check with a pipe wrench make sure everything is tight...also check to make sure that they did not over thread the pipe into the fitting as that can also cause a leak...you should be able to see a couple of threads showing on all of them.
Customer: replied 6 years ago.
Reply to repipeslo's Post: picture of valve and 90graphic
Expert:  repipeslo replied 6 years ago.
did you check to make sure they were tight?
Expert:  repipeslo replied 6 years ago.
that 90 on the side pointing towards the camera looks like it has been driven in pretty far...as i can't see any threads showing. Can you see any?
Expert:  repipeslo replied 6 years ago.

I recommend when using soapy water use blue dish soap...and use alot of soap to water and don't even spray the water just let it run down onto the pipe. (pour a stream of the soapy water onto it) I have check joints by spraying and they will not show at times untill you pour the soapy water onto it.

repipeslo, Plumber
Category: Plumbing
Satisfied Customers: 276
Experience: 10+ years experiance in the pipe industries.
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Expert:  repipeslo replied 6 years ago.
graphicgraphic
Expert:  repipeslo replied 6 years ago.

you didn't streatch the flex line out for it to reach did you?

Customer: replied 6 years ago.
I cleaned it off and I don't see any. graphic
Customer: replied 6 years ago.
Reply to repipeslo's Post: Np - plenty of slack. Have it in S shape along back wall using tywraps.
Expert:  repipeslo replied 6 years ago.

If the problem persists you can call your natural gas supplier. They usually do a free in home inspection for leaks. The fitting you showed me might just be your problem for it was installed incorrectly. Fittings should never be tightened down that far...the 90 itself may have a crack in it due to how far in the pipe is into the fitting.

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