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10-11-2023, 04:16 PM | #1 |
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Gas shut-off leaks-I think
My shutoff valve looks like all the ones in the catalogs, so I assume it is a late model replacement for the original. I shut it off faithfully after each trip (in and out of the garage) but the carb is still covered with gas, and it drips on the floor. I am inclined to get a hardware store ball valve with brass fittings to the flared gas line. Les Andrews says the valve is 1/2" NPT, but mine measures about 0.550" male thread OD, or closer to 3/8" NPT. Do I have an oddball or is Les wrong? I prefer to have the correct replacement in hand before removing the leaker.
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10-11-2023, 04:40 PM | #2 |
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Re: Gas shut-off leaks-I think
Russell to be sure it is the shutoff that leaks disconnect the gas line at the carburetor and put a can under it and test it.
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10-11-2023, 04:43 PM | #3 |
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Re: Gas shut-off leaks-I think
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10-11-2023, 05:29 PM | #4 |
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Re: Gas shut-off leaks-I think
The use of EZ Turn Lubricant will stop the petcock from leaking for a while and make it much easier to turn. See https://www.aircraftspruce.com/catal...ezturnlube.php
If you drive your car a lot and turn off the gas each time the lubricant will last about 6 months. Drain the tank then take the valve apart and smear it with the lubricant and re assemble it.
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10-11-2023, 06:01 PM | #5 | |
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Re: Gas shut-off leaks-I think
Quote:
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10-12-2023, 12:10 PM | #6 |
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Re: Gas shut-off leaks-I think
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I leave the tank fuel valve open and use the ball valve as the main shutoff. I also run the carb "dry" when parked inside the garage. |
10-12-2023, 12:37 PM | #7 |
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Re: Gas shut-off leaks-I think
Great photo. Per Joop's suggestion I discovered that the valve does, in fact, leak. I think I will use your suggestion, and I already have a flaring tool.
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10-12-2023, 12:49 PM | #8 | |
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Re: Gas shut-off leaks-I think
Quote:
Good luck measure twice then one more time before you cut the line because it has to fit spot on as there is no way to manipulate the distance. I cut the line on the curved side (where I wanted the valve located) and then measured the distance to the factory valve (straight line = easy measuring) but also visually checked the distance before cutting the second time (the ball valve displaced pipe) I installed the valve to rotate towards the direction of flow when on. Works good and you can only see the valve if you look under the dash. |
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10-12-2023, 04:03 PM | #9 | |
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Re: Gas shut-off leaks-I think
Quote:
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10-13-2023, 07:18 AM | #10 |
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Re: Gas shut-off leaks-I think
Valve thread size is 3/8" NPT.
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10-13-2023, 08:00 AM | #11 |
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Re: Gas shut-off leaks-I think
If you mean the part of the valve that screws into the tank? Les is
wrong. Not 1/2" npt. It's either 3/8" or 1/4"
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