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George H.
George H., Hyundai Technician
Category: Hyundai
Satisfied Customers: 18693
Experience:  Hyundai Gold certified, ASE Master tech 15+ years
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Fuel pump doesnt seem to energize when I turn the key on.

Customer Question

Fuel pump doesnt seem to energize when I turn the key on. Car wont start
JA: Is the car in "Park" or "Neutral?" Do you know if your car has a "wheel lock" feature?
Customer: Car is in Park. 2004 Hyundai Sonata 2.7
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: Had a new fuel pump and filter installed 2,000 miles ago. I'm thinking relay or crankshaft position sensor
JA: Anything else you think the mechanic should know?
Customer: Pending ECM codes forP1507 and P1505
Submitted: 1 year ago.
Category: Hyundai
Expert:  George H. replied 1 year ago.

Hello I will help,

The fuel pump is turned on when the computer sees the engine turing 250 rpm or more. Simply turning on the key does not run the pump.

The codes indicate a problem with the idle speed control but that would not keep the pump from running.

It is common for the crank sensor wiring's insulation to fail, if it is cracked replace the sensor. It is just above the starter.

Does your code reader show data? RPM while cranking?

Customer: replied 1 year ago.
I can get that info. I used to hear the fuel pump every other time I turned the key on until it reached pressure
Expert:  George H. replied 1 year ago.

The pump only runs when the computer sees 250 rpm.

If you can see a RPM reading then the crank sensor is OK. If the reading is lower than 250 - 300 like half then the IFS is the problem.

That would be my first stop, you can jumper the fuel pump relay from #30 to #87 pin socket to run the pump, if it has no spark it is not the pump.

Could be they spliced the pump rather than using the connectors and a splice has failed.

Let me know how I can help you test this

Thank you