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Dj
Dj, ASE Certified Technician
Category: Toyota
Satisfied Customers: 1910
Experience:  ASE Master Tech, 30+ years in automotive repair.
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TOYOTA PICKUP: 1991 TOYOTA 4X4 2.4 ENG NO FUEL FLOW UNLESS

Customer Question

1991 TOYOTA 4X4 2.4 ENG NO FUEL FLOW UNLESS YOU OPEN MASS AIR FLOW SENSOR DOOR
Submitted: 1 year ago.
Category: Toyota
Expert:  Dj replied 1 year ago.
Hello and thank you for trusting us with your question. I'm DJ.
The fuel pump turns on when the air flow door opens. That part is normal. But there's more to it.
Does the engine start and run? Does it start and stall?
Expert:  Dj replied 1 year ago.
There are two circuits that power the fuel pump. When you turn the key to the START position, the fuel pump gets power.
But when the truck starts and the starter is no longer engaged, another circuit takes over.
When the engine is running, it sucks air in through the air flow meter. This opens up the door in the air flow meter. This triggers a switch that turns on the circuit opening relay. When the relay is turned on, the fuel pump continues to run.
Please let me know what's going on with your truck and I'll help you fix it without throwing parts at it.
DJ

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