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400000 btu pool heater has flow
I was given a 400000 btu pool heater and replaced gas valve, control board, igniter. I ran 1.25 pipe for 50' then down to an existing .75 pipe for another 25' to the heater. Via manometer the static pressure is 7.8, however manifold pressure will not go above .5 ". My meter is a 275 CHF. I was wondering if the new gas valve was bad, but now think the meter is insufficient. The previiis heater was 260000 btu and ran ok until it died.
Thank you for any help.