Disconnect the fuel pump relay hook a test light to the battery positive and the fuel pump trigger wire on the self test connector in the engine bay. Top 5 fixes for fox body mustangs duration.
On 3 Performance Triple Fuel Hat Assembly 1987 2004
Fox body mustang fuel pump not turning on. Turn key to on testlight should come on. 3 of the fuel pump relay wires are hot and 1 is a groundthe tanlt green wire is the groundhoweverits a cycled ground controlled by the ecmrather than a constant groundlike everyone is use toiow the ecm turns this ground on off at willin order to control the fuel pump through the fp relaythe ecm grounds this wire in order to complete the circuit on the fuel pump relaywhich causes the relay to energizesending power to the fuel pump. With that in mind most of the symptoms of a bad fuel pump revolve around the vehicle stalling out or not running at all. I almost had a fuel pump on order. Mustang fuel tank pump in tank style 1983 1997 installation duration. Then the test light should go off after a few seconds.
Before i just go out any buy a new fuel pump i wanted checked the fuel pump relay and the inertia switch. Or so i thought. If your ford mustangs fuel pump goes bad no fuel or not enough fuel depending on whether or not its out all the way can enter the engine. Without gas your mustang will not run at all. Best fuel system upgrade. When it comes to the relay when the ignition is on pin 4 has 12v dc on it and pin 2 has 36v dc on it.
Unfortunately they wear easily and cease to work. I have a 89 lx 50 and recently the fuel pump stop priming. Fox mustangs come equipped with a clutch type limited slip differential. Cj pony parts 88358 views. If you stomp the gas and only see one tire mark it means the clutch discs inside the differential have worn out. Good thing i probed some voltages before dropping the fuel tank from the car.
The fuel pump died again.
Gallery of Fox Body Mustang Fuel Pump Not Turning On
