***Edit: Leaving the question up for reference, but the problem is solved. Not a carb problem, just a bad vacuum leak at the intake.***
Original Question:
Rochester "RS" single barrel according to the stamps on the side; I presume it's still a "B"? Has an Autoline rebuild tag labelled C900,
The engine is a 1957 full pressure 235 (in a '49 3600 but the engine seems to be all '57).
It idled when I first got it, but was full of crud from sitting. The fuel tank and lines are new, and regardless I have good pressure and clean new fuel not only AT the carburetor but IN the carburetor: Float bowl fills up just fine. Accelerator pump SQUIRTS FUEL. But this cursed abomination refuses to FEED FUEL FROM THE BOWL TO THE INTAKE. If I pour gasoline into the throat, the truck starts & runs until that gets eaten up - and by repeatedly pumping the gas I can sort of keep it going.
I can blow air through every passage, took the body and base apart, looking at the shop manual drawings carb cleaner/air seems to come out of everywhere it's supposed to. That includes that passage in the casting running from the main jet at the float bowl to the base by the butterfly.
Power valve is free and clean. New base gasket and insulator although I can't keep it running long enough to say for sure I don't have a vacuum leak somewhere.
Thoughts? This is clearly something dumb that I'm missing. Thanks folks...
Update: I got to thinking perhaps the float level was out of spec (I hadn't actually checked it). It WAS out of spec; adjusted but there was no change to this condition.
Last edited by NorthCoast3800; 08/26/2020 12:09 AM. Reason: Update
