What is this?

carrasco4712

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It's something for the vacuum but what is it?

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cpdenton

Truck needs paint.
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Low vacuum warning switch. It turns on the brake light when a low vacuum situation is present.
 

icanfixall

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Many times these low vacuum "tuna cans" don't work. BTW the sender for this in internal. Someday I might open one up to see why they fail so often. Remember the low fuel pressure sender is on the outlet side of the filter head on top.
 
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