I say its worth a try. But you could have a bad ground also. A fuel pressure test wil also tell you if your pump is getting weak or have a bad regulator.
PURPOSE Provides pressurized fuel to the fuel injectors.CONSTRUCTION The pump is a turbine type hydraulic unit directly coupled to a permanent magnet motor. Fuel is used as a lubricant and coolant for the motor. A check valve is incorporated in the fuel outlet and a pressure limiter valve is located on the pressure side of the fuel pump housing with a return passage to the fuel inlet side.OPERATION When the rotor disc rotates, the rollers are pressed outwards by centrifugal force and act as a circulating seal. A pumping action is created by the circulating rollers which draw in fuel at the inlet port and force the fuel through the outlet port into the fuel system.When the pump is shut off, the check valve in the fuel outlet will close, therefore prohibiting the fuel from returning to the fuel tank via the fuel pump. The check valve will therefore maintain a pressure in the fuel lines called the "rest pressure".The maximum fuel pump pressure (not fuel system pressure) is dependent on the calibration of the pressure limiter. If the fuel pump pressure exceeds a preset limit (for example a clogged fuel filter), the pressure limiter will open a by-pass to the fuel inlet side of the pump.
Ok I must have mis read you. You dont have spark at first right? then when the pump sounds you can start it, is this correct?
If this is correct then your pump relay could be the issue. It works with your pcm that could cuase the no spark condition in your mustang. I have included some more discription for you.
PURPOSE The Constant Control Relay Module (CCRM) interfaces with the Powertrain Control Module (PCM) to provide control of the cooling fan and A/C clutch. The module includes the PCM power relay to provide power to the PCM.These relays are contained in one housing, resulting in longer service life and reduced wiring requirements for operation.CONSTRUCTION The CCRM has one 24-pin connector. Relays contained in the housing are independent of one another. OPERATION The relays contained within the CCRM are interdependent and work with each other. The following describes the different relay functions within the CCRM:EEC Power Relay For any other circuit in the CCRM to operate, this circuit must be powered up. This prevents actuators from being turned on without the EEC system having control over them.Fuel Pump Relay The fuel pump relay circuit controls the fuel pump. The PCM provides the ground circuit for the primary side of the relay. The secondary side supplies Battery Voltage (B+) to the fuel pump itself.Cooling Fan Motor Relay The cooling fan motor is controlled during vehicle operation by the constant control relay module (CCRM) (12B581) and powertrain control module (PCM) (12A650) which energizes the cooling fan motor under the following conditions:
Low Fan Control Relay The Low Fan Control (LFC) relay controls the electric cooling fan. The primary control circuit of the LFC relay is normally high (B+) . In this state the low speed cooling fan runs continuously. To turn the fan off, The PCM grounds this circuit, pulling it low (near zero volts). A "fail safe" is built into the LFC circuit to run the fan anytime the EEC power relay is activated, should the PCM fail open circuit. High Fan Control Relay The High Fan Control (HFC) relay circuit operates the high speed electric cooling fan. If the Engine Coolant Temperature (ECT) sensor relays a high temperature or overheat condition to the PCM, it activates the HFC. In order to turn the high speed cooling fan on, the PCM grounds the primary circuit of the HFC relay. The secondary circuit applies B+ to the cooling fan motor.Wide Open Throttle A/C Control Relay This circuit controls the A/C compressor clutch during normal operation. This circuit also disengages the A/C clutch as commanded by the PCM during Wide Open Throttle (WOT) conditions. This solid state relay has two control circuits. One is used to engage the A/C clutch upon demand from the vehicle operator and the A/C cycling pressure switch. The other control is used to disengage the clutch upon command from the PCM.Power Ground This circuit provides the CCRM with a ground source for operating various controls. The circuit uses one pin that goes to the battery negative terminal.
right, first car won't start, then I turn ignition to on position, the pump makes the 2 sec pumping sounds that are normal when first starting I wait till the car makes a pumping sound a second time but shorter than usual, some times i wait for a few minutes sometimes i wait 5 min. or more but eventually i will here the sound of pump then i crank it over and it starts. (if i don't here the second pumping sound and crank engine I have no spark). that is why i don't think it is pump because the pump does not control that spark.
crazy i know.