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Old 11-14-2020, 06:23 AM   #1
jerrytocci
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Default Gas cap 30/31 VENTED ??

How can I tell if my new cap is properly vented and how to fix it if it is not
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Old 11-14-2020, 07:27 AM   #2
Patrick L.
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Default Re: Gas cap 30/31 VENTED ??

Is the engine running properly ?

A new cap should be vented correctly. But look at the underside, remove the gasket and look at the vent hole[s].
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Old 11-14-2020, 08:23 AM   #3
jw hash
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Default Re: Gas cap 30/31 VENTED ??

unhook your gas line from your carburetor and put the end of line in a can, turn on the gas and see if it run free for a minute or so. if it slows down at all open the cap. if it is not vented good enough. you will see the difference in the flow.
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Old 11-14-2020, 08:32 AM   #4
McMimmcs
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Default Re: Gas cap 30/31 VENTED ??

Is this a new to you cap or a brand new cap? Is it a reproduction cap?
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Old 11-14-2020, 11:06 AM   #5
jerrytocci
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Default Re: Gas cap 30/31 VENTED ??

it's a re-pop and I suspect something . I can't blow air through the cap
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Old 11-14-2020, 11:13 AM   #6
katy
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Default Re: Gas cap 30/31 VENTED ??

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Quote:
Originally Posted by jerrytocci View Post
it's a re-pop and I suspect something . I can't blow air through the cap
It sounds like you have a radiator cap.
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Old 11-14-2020, 11:23 AM   #7
jerrytocci
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Default Re: Gas cap 30/31 VENTED ??

There is a small hole in the underside but I can't blow air through it . Do I run a drill through it ??
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Old 11-14-2020, 01:07 PM   #8
Tom Endy
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Default Re: Gas cap 30/31 VENTED ??

Lay the cap on a flat surface bottom side up. Fill the outer rim with water and blow through the vent hole with a straw. Bubbles should appear in the outer rim. See attached article.

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File Type: pdf Gas Cap-30-31.pdf (224.1 KB, 47 views)
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Old 11-14-2020, 01:08 PM   #9
jerrytocci
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Default Re: Gas cap 30/31 VENTED ??

can't remove gasket
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Old 11-14-2020, 01:13 PM   #10
jerrytocci
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Default Re: Gas cap 30/31 VENTED ??

thank you Tom
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Old 11-14-2020, 03:04 PM   #11
Bob C
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Default Re: Gas cap 30/31 VENTED ??

Quote:
Originally Posted by katy View Post
It sounds like you have a radiator cap.

The radiator cap is smaller than the gas cap.
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