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Fuel pump

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neil9

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My S1D has a mechanical pump only-no electric backup. The fule pressure is 4psi at cruise, 5 psi full throttle and <1 psi below 1/2 throttle. Engine is AEIO 320.
Recently I have detected a regular miss below 1500rpm. It is not a mag or plug because it is unchanged on either mag, and - one mage is new ( 30hrs ago) and the other was OH 30 hrs ago.I have checked for induction leak and all looks good. Have not checked injectors.
I have my suspicions but wont voiuce them yet. Comments?

neil
ZK-KEM
NZ
 
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