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Hi Michael, my name is Jason.
Mercurys are cataloged by serial number, do you have the serial number on your engine handy?
On your fuel pressure reading, was that made with an accurate gauge? Do you trust that reading?
Fuel pressure is supposed to be 106 to 110 psi. Did you happen to check your air pressure to see if that was low as well?
Are you still with me?
Good morning, and sorry for the delay. When you posted back last night I was already off to bed.
Is the fuel pump not turning on at all now?