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Shrader Valve Help!

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Old 11-09-2004, 06:40 PM
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Default Shrader Valve Help!
Does anyone know what size the shrader is? Is it 4an? Also is it male or female coming off of it? Im trying to figure out how im gonna run my Hobbs switch.
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Old 11-09-2004, 09:09 PM
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Just curious...is a Hobbs switch appropriate for use with gasoline as the pressure medium? I thought they were made for air only, but maybe I'm wrong.
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Old 11-09-2004, 09:16 PM
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What Im using is a fuel pressure safety switch some people call it a Hobbs Switch!
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Old 11-09-2004, 09:35 PM
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-4 AN female fitting is what you need to hook to the shrader valve.
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Old 11-09-2004, 10:53 PM
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Just don't forget to disconnect the battery, and have a rag ready to drain off the pressure before you remove the valve stem.
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Old 11-10-2004, 03:26 AM
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Originally Posted by ZYA_LTR
Just don't forget to disconnect the battery, and have a rag ready to drain off the pressure before you remove the valve stem.
Take the gas cap off too.
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Old 11-10-2004, 03:33 AM
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is a -4AN female what i need to hook my electric fuel pressure guage up to my radix?
same thing as the schrader valve, right?
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Old 11-10-2004, 04:30 AM
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Originally Posted by Chingon
Take the gas cap off too.

Oh yeah, that too.
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Old 11-10-2004, 09:45 AM
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Thanks guys! All Im gonna need is a purge/gauge adpater and Im ready to go!
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Old 11-10-2004, 09:59 AM
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Originally Posted by Chingon
Take the gas cap off too.
What is that gonna do??
If you want to keep from spewing gas from the rail when you pull out the schrader valve, pull the fuel pump relay then crank the truck and let it die. Taking the gas cap off is not going to relieve the pressure in the fuel rails.

btw.. a female 4AN is what you need to connect your hobbs switch to the fuel rail at the test port.
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