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07-28-2019, 03:16 PM | #1 |
Member
Join Date: Jun 2010
Posts: 52
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Fuel petcock hard to turn
My petcock has gotten hard to turn. It was new a couple years ago. Any suggestions on freeing it up?
Last edited by ROBERT JAM; 07-28-2019 at 03:28 PM. |
07-28-2019, 03:42 PM | #2 |
Senior Member
Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: Fuel petcock hard to turn
Back off a little bit on the packing nut and see if that helps. loosening the packing nut a small amount has worked for me .
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07-28-2019, 04:20 PM | #3 |
Senior Member
Join Date: May 2010
Location: Qld, Australia
Posts: 4,195
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Re: Fuel petcock hard to turn
Pour about 1/2 litre of engine oil into the tank.it will settle on the valve and lube it up.
Lawrie |
07-28-2019, 04:33 PM | #4 |
Senior Member
Join Date: Aug 2018
Posts: 2,332
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Re: Fuel petcock hard to turn
I've read that use of Marvel Mystery Oil added to gas helps prevent this. An opinion of others, do not know if true.
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07-28-2019, 05:07 PM | #5 |
Senior Member
Join Date: May 2011
Location: Elyria, Ohio
Posts: 753
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Re: Fuel petcock hard to turn
I don't know if MMO will free up the valve, but I never put fuel in my car without it.
Marty |
07-28-2019, 07:39 PM | #6 |
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Join Date: May 2010
Location: Mpls, MN
Posts: 27,582
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Re: Fuel petcock hard to turn
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08-09-2019, 08:51 PM | #7 |
Senior Member
Join Date: Jul 2018
Location: Annandale, VA
Posts: 150
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Re: Fuel petcock hard to turn
There is a lubricant designed for fuel valves: "EZ Turn" fuel resistant lubricant. Here is one source:
https://www.aircraftspruce.com/catal...ezturnlube.php |
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