04-19-2010, 04:25 AM
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CC Member
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Join Date: Mar 2001
Location: E BRUNSWICK N.J. USA,
Posts: 3,841
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Not Ranked
Too much pressure for a carb seat and needle
Big Boss 6psi to 6.5 is the limit on most carbs. Unless you car is having vapor lock after driving, having 2 pumps can cause a problem like said above. If your car has a return line off the regulator. you should be able to adjust it down to 6 psi. Are you getting black smoke out of the motor on startup or around a turn? If not you might want to leave the setup the way it is. If it was my car. I would remove the mechanical pump and just run electrical and cap off the pump or remove it. Put a bypass connection in there that if your back pump goes you could use the front one to get home. Return line is also important for keeping pressure steady and not getting spikes and having the needle pop off the seat and push too much gas into the carb and possible motor. Electric pumps don't like to be deadheaded without sensors to have the pump increase and decrease pressure. Rick L.
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