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Also, make sure that the new pump did not push any debris into the inlet needle in the carb and that the floats still float!

Towman is exactly right. Try about 3 psi with a bypass regulator and you should be fine. Be careful when you restart the truck, you may want to pull the plugs just to make sure you do not "hydraulic" the enginge. Just crank it over with the plugs out to make sure that there is no gas in the...