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what should the fuel pressure be at the filter head? i installed an airdog ii and want to make sure it is set at 12psi. i am using the merchant auto adapter to install a pressure gauge in the filter head.
 

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You may have to lower the pressure a little-- the early engines developed a surge at idle when the pressure was over 10 lbs.
 

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With my AD 150, my gauge tells me I am getting 11
 
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