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Is the red lever on the electric primer valve in the right ( run ) position ?

You can buy brass shear pins at 29 cents each.----Or buy new props at $125 each.-----A choice you have to make.

Blow some air in it.----Or remove elbow at the motor to clean it out.

Tell tale could be plugged.-----Or put water in your test bucket 6" above the impeller.

People are putting down deposits for next years models.----No need for any discounting !

Post a picture of the primer solenoid valve and where the hoses off it go.----Seems to me those have to do with the primer.----Agreed not all these motor had the airbox.----I think it was left off of these starting in the early 1980's models !!!

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You can use a brass pin as long as you have spares and tools handy.----Make sure your last spare pin is the stainless " drive pin " .

Any body plugged into shore power in your area.-----Hurry contact your marina with the concern.

Possible that tell tale is plugged.----Or a common mistake is not enough water in a test bucket.----Water must be 6" above the impeller.

The question is ----Does spark jump a gap of 7/16" on a test device.----Your answer as it stands is a no.----Sparkplugs are not used to test maximum ignition output !

Hurry------Visit -------leroysramblings-----Likely has instructions for this simple procedure on that 1956 model.

The bulb must go hard.

Your location ?-----I thought every outboard repair shop could do this job blindfolded.-----I used to do them all the time 50 years ago !!

On the 5.5 HP you have to remove the powerhead.----Simple job with 7 screws and a few hoses.----Allows you to inspect / replace o-ring and gasket on the mechanical seal on top of the driveshaft.----A good design and the shift mechanism never goes out of adjustment like many newer motors.

Does spark jump a gap of 7/16" on all 4 leads , yes or no.-----Stop trying to run this motor.----Find the problem.-----If a carburetor was plugged you would be starving one cylinder of gasoline and most important ----OIL----as well.----You could do serious damage.-

I see the fuel pump available at $125.92 -----Hurry to your local Mercury dealer and order one for your motor.

Post compression test numbers.----Maybe a plugged carburetor.------Maybe a ruptured diaphragm in the fuel pump.-----Sheared flywheel key.-----Should be easy to determine what the issue is.

Well----I machine my own sleeves for Mercury carbon steel driveshafts.----In fresh water I have never seen a pitting issue on driveshaft on Johnson / Evinrude motors.