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fuel pump, relay, check valve diagnosis help needed 200 1983

posted by  Don Foster on  Sat Sep 27 13:22 CST 2003
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last visit: Sun Oct 5 11:53 CST 2014
[RELATED]

That "initial prime" is not really an intentional prime, so to speak. It occurs (randomly) as a result of an initial ignition pulse when the ignition system is first energized.

The fuel pump relay requires a series of pulses from the ignition primary in order for it to engage and power the pumps. This is a safety feature.

These pulses occur when the engine is running and also when you crank it.

When you turn on the key and power the system, the electronic ignition sometimes produces a single spark -- it probably depends on the relationship of the reluctor to the sensor inside the distributor. Or maybe it results from charging a power supply capacitor in the ign module. Whatever, the ignition sometimes, but not always, produces a spark when first powered.

This pulse will trigger the fuel pump relay for about 1/2 second.

Sometimes it happens, sometimes it doesn't.
--
Don Foster (near Cape Cod, MA)






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