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Why fuel pump was on for 3 secs and off..


Suba_GL_87
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Why fuel pump was on for 3 secs and then off..

 

When I turn key on and fuel pump was buzz and stop for 3 secs.

i was replaced ele. Fuel pump than carb pump.

 

Everything is good running when I put starting fluid.

 

87 Subaru gl ea82 carb manual.

Came in ej22 from

Legacy 91' manual.

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The ECU primes the fuel system (runs the pump for 3 secs) and then turns off if it does not detect the engine cranking. Once the ECU starts receiving a crank signal it will turn the fuel pump on. This is a safety feature in the event you're in a crash, the fuel lines are damaged, and the engine has stopped. The ECU will shut off the fuel pump so it's not pumping fuel all over the place.

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