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Repair guides and support for the fourth generation of Ford Mustang, including the Mustang GT and Mustang Cobra.

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Will start and run but when you shut it off it will not start again

I've put this car in several shops, the fuel pump has been check, fuses have been checked, fuel regulator checked, I put a gauge on the fuel rail and the pressure will shoot up and then go way down when you apply a little gas. And its almost like it either floods its self with gas or does the opposite whenever you shut it off so when you go to crank it again it will not start at all. I have absolutely no idea what it could possibly be nor have I heard anyone talk about this, any advice???

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Reviewed sidebar questions for help? Tried Ford Mustang forums? Whether older carburetor/distributor or electronic fuel injection, knowledge of fuel systems may best come from service manuals (Alldata.diy or Mitchell Data, both online). Less informative may be Haynes or Chilton manuals.

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You got some conflicting info going on here. I need year Engine and trans info and any aftermarket mods to get a good path to start down.

Gonna need more data, so here some tests to try:

1, check the relay for the fuel pump and ECU for the pump

(injection systems cant "flood" with fuel like TPI or carbs, unless told to by ECU/sensor malfunction)

2 Sounds like a crank/cam angle sensor issue. Because of the lack of restart

(if the ECU does know where they are in time they will act like it "ran out of gas")

3 check the key tumbler. early rfid key systems have battery and sensors in the steering column

Along with about 50 other things. Sorry if I caused more confusion than help

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It sounds like your Ford Mustang may have an issue with the fuel pump or the fuel pressure regulator. When you apply a little gas, the pressure in the fuel rail shoots up and then drops, which could indicate a problem with the fuel pump or the fuel pressure regulator.

One potential cause of this issue is a faulty fuel pump. The fuel pump is responsible for delivering fuel from the gas tank to the engine, and if it is not working properly, it can cause the engine to run poorly or not start at all. A faulty fuel pump may not be able to deliver enough fuel to the engine, which can cause the engine to run lean (not enough fuel) and potentially damage the engine.

Another potential cause of this issue is a faulty fuel pressure regulator. The fuel pressure regulator is responsible for maintaining the correct fuel pressure in the fuel system. If it is not working properly, it can cause the fuel pressure to fluctuate, which can affect the engine's performance and cause it to run poorly or not start at all.

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Jacob Alford 将永远感激不已
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