No. Whatever is in the carb will often disappear on these older engines with the after boil. With bad fuel pump checkvalves, everything in the lines and pumps goes downhill back to the tank, or some of the fuel in the lines will also afterboil.
If there is a slightly leaking checkvalve (just one) the pumping performance will go to crap. Cranking speed just won't do it. Running speed will/may.
I picked up a dozen M38A1 pump kits a lot of years ago, and cannot count the different pumps that I have used those valves in. Just in the last 6 months I fixed a Jeep pump (uses 6 of the checkvalves), a pump in the museums white scout car (uses only two of the checkvlaves), and a carrier engine.
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