Dwight Romberger Posted October 4, 2014 Share Posted October 4, 2014 (edited) I have installed a rebuilt Rochester 1 bbl for a 60-62 261 Chevrolet on my otherwise stock 1930 Buick. 1) What is the optimal psi at which to set my Holley fuel regulator?2) At what is very low psi (1-4 psi) fuel pours out of the carb at the linkage. Am I correct that either the float is set at the wrong height or the valve is stuck?Many thanks in advance for your advice.Signed (very) frustrated in Allentown. Edited October 4, 2014 by Dwight Romberger (see edit history) Link to comment Share on other sites More sharing options...
Larry Schramm Posted October 4, 2014 Share Posted October 4, 2014 If fuel runs out of the carb at those pressures, I would say that you have one of three things happening. They would be the float is too high and will not shut off the fuel, or the needle & seat is not sealing because of a mating problem, or maybe there is a cracked seat in the carb that keeps fuel flowing. Link to comment Share on other sites More sharing options...
Guest robert campbell Posted October 4, 2014 Share Posted October 4, 2014 I have installed a rebuilt Rochester 1 bbl for a 60-62 261 Chevrolet on my otherwise stock 1930 Buick. 1) What is the optimal psi at which to set my Holley fuel regulator?2) At what is very low psi (1-4 psi) fuel pours out of the carb at the linkage. Am I correct that either the float is set at the wrong height or the valve is stuck?Many thanks in advance for your advice.Signed (very) frustrated in Allentown.That carb should handle 5 pounds of fuel pressure easily. Do you know if the float is brass of Nytrol covered foam? I rebuild, rebush, and in some cases wet test many brands of carbs in the Seattle area. Love Rochester carbs. They are some of the easiest to work on and seem to always work fine. Sometimes a dry carb will have the float hang up the first time. A sharp whack with a screwdriver handle will normally un stick it. Sometimes a small particle of dirt will get on the needle valve and seat mating surface. In this case a vice grip to gently crimp a rubber fuel line coming in will help. Crimp the line and start it up. When the engine starts to struggle, unclamp the line, and the fast surge of gas into the empty float bowl will knock off the debris in some cases.RobAttached pics are some of my most difficult work. They both purr like kittens! The first one is 6 Rochester 2 Jets on a 428 Ford on my brothers Mustang. More is better!!! The second is my wife's car!! 48 IDA's on a 13 to 1 high zoot 289!! 4 speed and my wife loves to drive it!! Link to comment Share on other sites More sharing options...
Dwight Romberger Posted October 4, 2014 Author Share Posted October 4, 2014 (edited) Thanks. That makes sense Larry.Looks great Rob!I will enjoy giving it a "WHACK." Edited October 4, 2014 by Dwight Romberger (see edit history) Link to comment Share on other sites More sharing options...
Dwight Romberger Posted October 4, 2014 Author Share Posted October 4, 2014 Really impressive fuel line work on the first one!Did you braze the tee's in the copper line? Link to comment Share on other sites More sharing options...
Rusty_OToole Posted October 4, 2014 Share Posted October 4, 2014 5 pounds is pretty high. I would set it at 2 pounds at the carburetor. Normal fuel pump pressure 4 or 5 PSI. Link to comment Share on other sites More sharing options...
Guest robert campbell Posted October 4, 2014 Share Posted October 4, 2014 The gas line was provided by a guy in Florida some time back. I built all the throttle linkage with left and right threads out of hexagonal stock. It is a bit of fun to get them all synced together. Link to comment Share on other sites More sharing options...
Guest robert campbell Posted October 4, 2014 Share Posted October 4, 2014 Thanks. That makes sense Larry.Looks great Rob!I will enjoy giving it a "WHACK."Hope that works. The Nytrol coated foam floats like to get a puncture in them and soak up gas. I do not like them and replace with brass floats. You can tell if a brass float is sunk!!Rob Link to comment Share on other sites More sharing options...
Larry Schramm Posted October 5, 2014 Share Posted October 5, 2014 You can make a cork float out of wine corks glued together with super glue. After shaping on a band saw and sander, coat the complete cork float with super glue to keep it from soaking up the new alcohol based fuel. Works well. Link to comment Share on other sites More sharing options...
Dwight Romberger Posted October 5, 2014 Author Share Posted October 5, 2014 Looks like I might be OK. Regulator was lying: over 6 psi and timing was significantly off,I decided to quit while I am aheadMore news tomorrow! Link to comment Share on other sites More sharing options...
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