Packard Forum Index » Post-War (1946-54)

WDO (-531) on my 1947 Packard 356 is dumping fuel from main nozzles at idle. Of course, it's way too rich and won't idle. The main jets are stamped 120 and "1395" or "139S"; how can I tell if these are the correct size for the carb?

I've lowered the metering rods a little, but without the special Carter T109-113 gauge, I can't tell exactly where they should be. Surely someone reproduces these metering rod gauges, right?

It shouldn't matter what jets you have in it, there should be no significant flow from the main jets at idle. Either the float level is too high, the fuel pump is overpowering the float valve, or your air bleeds are plugged.

Thanks, Ross, for the advice. Turns out the idle passage gaskets (between bowl section and lower body) weren't sealing. It idles fine now!

I also wanted to know if the main jets were correct, while it was apart, and they are.