So I drove my car around for 3 months and finally one day my car dies and won't start. I've had it diagnosed to the fuel pump and have replaced everything down to it... The relay, the sending unit and the pump 3 times n still nothing.. Why would my fuel pump not get power all grounds are working I have full power to the pump just won't turn on.. The check engine light was on before it died.
My car has an automatic transmission.
Hello, first task is to extract the problem codes which are setting the Check Engine Light on. This can make diagnosis and repair much faster and less expensive. I am confused by our comment that "have full power to the pump, but it won’t turn on", combined with "all grounds are working". Perhaps there is connectivity as tested by an ohm meter, but not good enough current capacity?
Check for voltage at the pump terminal when you are trying to start the car. It should be very close to 12 volts. If not, there is a current flow/connector corrosion issue. Also - the oil pressure switch is a safety switch for the fuel pump circuit - no oil pressure, no fuel pump operation. If this switch fails, the fuel pump does not run.
If you need help with this, I would recommend having the electrical issue diagnosed by a mobile, professional mechanic, such as one from YourMechanic, to inspect this problem, get an accurate assessment of damage and cost estimate for repairs.
Have a car question? Get free advice from our top-rated mechanics.
Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing