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New to Volvos, got a 1972 142E, fuel injection question. 140-160

posted by  Phil S. on  Tue Feb 10 07:47 CST 2004
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last visit: Fri Oct 24 13:18 CST 2014
[RELATED]

That's proper operation. The fuel pump shuts down after 1-2 seconds if the ECU doesn't receive a tach signal from the trigger contacts in the base of the distributor.

There is no feedback between fuel pressure and the electronics. The pressure regulator is purely mechanical. When a tach signal is present, the pump continually over-supplies fuel to the regulator, which routes the excess back to the tank.

This article should give you an overview:

All About D-Jet Fuel Injection






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