I'm having a problem with an 1850-3 after a rebuild. I can't get any fuel through primary power circuit. The engine idles, but if you increase throttle no fuel drips out of the boosters. The engine leans out & dies. The accelerator pump works fine. If I crack open the secondaries fuel comes out of the boosters and the engine runs. Then if you open the primaries it dies. The float level is correct. I've tried 66 & 70 jets. I don't have any vacuum leaks. I checked the metering block gasket to the pic on the Holley website. I've tried another power valve. It just won't pull fuel through the power circuit. This is mounted to a 350 SBC.