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Order Ford 640 Parts Online

Re: Ford 640 gas shut off valve leak

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Ed Hotaling

03-07-2014 04:16:36

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Where is the gas coming from? Is it the fuel line? Around the valve shaft? The mating surface between the tank and the valve? It does make a difference in how to address it.

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03-07-2014 04:21:39

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 Re: Ford 640 gas shut off valve leak in reply to Ed Hotaling, 03-07-2014 04:16:36  
It's not the fuel line.
I believe it's the valve base.

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Ed Hotaling

03-07-2014 04:59:05

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 Re: Ford 640 gas shut off valve leak in reply to Jeeps, 03-07-2014 04:21:39  
I know from experience that those are a royal pain to get at, but the thing to do is take it off, clean both surfaces and make sure the o-ring is not damaged. Most silicone form-a-gasket products are gasoline soluble so that won't work. Get the bolts that hold it in place all started, then tighten them evenly and only as much as needed, Too tight can cause the gasket (o-ring) to squeeze out of place. Like I said, it's a pain in the you-know-what. When I did mine, I sounded like a drunken pirate, but it held.

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03-07-2014 05:41:58

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 Re: Ford 640 gas shut off valve leak in reply to Ed Hotaling, 03-07-2014 04:59:05  
I appreciate your response.
Sounds like I could be guilty of over tightening the bolts and that o-ring, to me, could be made a little more dense so that it makes a better seal. I'll keep trying. Thank you for your time. I'll let you know how it goes.

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Bill Allis

03-08-2014 07:50:17

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 Re: Ford 640 gas shut off valve leak in reply to Jeeps, 03-07-2014 05:41:58  
My 801 was leaking and I was ready to change the 0 rings, but I discovered if I didn't open it all the way, just 2 turns, it did not leak.

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03-08-2014 17:36:43

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 Re: Ford 640 gas shut off valve leak in reply to Bill Allis, 03-08-2014 07:50:17  
Thanks to all of you for your ideas. I'll try them out and let you know what happens. Thanks again.

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