I donít own a gauge (yet) so Idk how much fuel pressure Iím getting but the little pressure gauge that is on the line reads 32. The car just started giving me some troubles at start up after itís been sitting over night or while Iím at work so Iím leaning towards a fuel problem. The engine and fuel system were replaced about 40k miles ago and I can hear the pump prime when I turn the key over but it will only start when I pump on the peddle when I turn the ignition. Yesterday it took about 10 minutes and when it finally started my low coolant light was on. What else could keep a 95 mustang from starting?
When you say "the little pressure gauge on the line",you mean the Schrader Valve, correct? The next time you attempt startup & it fails to start immediately,cycle the key on for a couple seconds then off then cycle the key like this for a total of 4-5 times then attempt startup again.If it starts,thats an indication the fuel pump is weak.When you cycle the key it allows a weak pump to gradually build up pressure in the lines and fuel rail.If this cycling of the key doesn't work,try holding the pedal to the floor while turning the key to start.After a few seconds of doing this,release the pedal while you continue cranking the engine.If it starts,this indicates something is causing an engine flood condition and once you do the floored pedal routine,this clears the excess fuel out of the engine which allows it to start.A engine flood condition is normally caused by 1 of 3 things.A leaking fuel pressure regulator,a leaking injector or a defective ect sensor.If the tests above don't work,hold the pedal 1/4 to 1/3 of the way down while turning the key to start.If it starts up using this routine, this normally indicates the ect sensor is bad.A bad ect usually outputs a reading that indicates the coolant temp is too low,which triggers a fuel trim way too rich.What pressing the pedal down 1/4-1/3 of the way does (while cranking) is it allows additional air to enter the engine through the now open throttle blade and this additional air thats now combined with the rich fuel mixture allows the engine to start.Another test you should do is check residual fuel pressure once the key is turned off.So turn the koeo,record pressure,turn the key off,wait 60 seconds then record pressure again.Does pressure drop more than 5psi in that 60 second time period? If yes,you'll have to grab a rag and a pair of vice grips then use them to pinch a soft section of the fuel line closed near the passenger valve cover. Once pinched,run the same pressure test that you did above to see if the pressure still drops or not.
IF IT DOES still drop,the fuel pump check valve is bad,the S hose is leaking or the fuel pump hanger is leaking inside the tank.
IF IT DOESN'T still drop,the fuel pressure regulator is leaking or a injector is leaking.
When a regulator leaks,fuel seeps out of its vacuum port and/or the vacuum hose will be wet inside.
The low coolant light just means the coolant level in the reservoir bottle is low and needs to be filled to the appropriate line on the bottle.If the coolant level is fine,this usually indicates the low coolant sensor is bad.