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Good running 73 Spider sat for about three months and when I started it it is missing. While running, I pulled the wires off of the plugs one at a time and determined the #3 cylinder is not firing. Removed the plug and started again to see, yes, the plug is sparking. The cylinder is dry and leads me to believe no fuel is reaching #3 cylinder. It ran fine the last time I drove it. What could cause a sudden change? The car has a mechanical fuel injection pump that was rebuilt some time ago.
Do injectors suddenly plug?
Vapor lock, or something like that?
How would you troubleshoot this?
 

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Do injectors suddenly plug?
According to Wes Ingram, the spica specialist, they almost never go bad.
However, the spica system does need a very clean fuel supply. Have you changed the fuel filters in the past?

This thread shows the testing procedure of the injectors (and, includes the link to Wes Ingrams "Fuel supply diagnostics guide")
Note it says, "They should only undergo a test when the cause for malfunctions is unquestionably attributed to the injectors themselves"
http://www.alfabb.com/bb/forums/carburetors-fuel-injection/163544-spica-fuel-injector-diagram.html
 

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Loosen the fuel pipe to the number 3 injector and see if you have any fuel seep out.

If no, remove the inspection plate on the side of the pump section and observe the connecting rods go up and down as the pump is turned . . . checking for a broken connecting rod.
 
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