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Old 07-28-2019, 03:16 PM   #1
ROBERT JAM
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Default 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.
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Old 07-28-2019, 03:42 PM   #2
Purdy Swoft
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Default 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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Old 07-28-2019, 04:20 PM   #3
Lawrie
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Default 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.
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Old 07-28-2019, 04:33 PM   #4
30 Closed Cab PU
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Default 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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Old 07-28-2019, 05:07 PM   #5
marty in Ohio
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Default 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.
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Old 07-28-2019, 07:39 PM   #6
Tom Wesenberg
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Default Re: Fuel petcock hard to turn

Quote:
Originally Posted by 30 Closed Cab PU View Post
I've read that use of Marvel Mystery Oil added to gas helps prevent this. An opinion of others, do not know if true.
MMO helps, and I also use it. Also turn the valve ON and Off at least once a week, even if you don't drive the car. This modern gas evaporates quickly and leaves deposits behind that help stick the valve. I restored my valve over 20 years ago, and it turned very easily until I let the car set parked in my garage for a year.
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Old 08-09-2019, 08:51 PM   #7
Paul Bjarnason
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Default 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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