92 ford ranger 4.0 4x4 wont start

[jhonny reb]

hello everybody my 92 ford ranger 4.0 will not start i have fuel and spark but my injectors are not pulsing it will crank and run with just a small shot of starting fluid and run and start fine till i shut it off and let it set for severel hours then will not start again till i give it a shot fluid again does anyone have any idea what my problem might be thanks ps truck sat for close to a year

 

[adsm08]

You are 100% sure there is no injector pulse?

Sounds more like pressure bleed back than loss of injector pulse since you say it keeps running on it's own once it catches on starting fluid.

 

[jhonny reb]

would that be fuel pressure regulator i disconnected the return line from the regulator and switched the key fuel flowed with quit a bit of pressure through the regulator. i checked the injectors with a test light i could have done it wrong

 

[RonD]

Fuel injectors should all have 12v when key is on, the computer(PCM) grounds each injector to get it to fire.

You should have 30+psi at the fuel rail with engine off and after turning key on and off a few times, i.e. running the fuel pump for 3 or 4 seconds.
Fuel pump comes on for 1 or 2 seconds each time you turn the key from off to on, you should be able to hear it.


Volume is part of pressure but doesn't tell you much, if fuel came out that means the fuel pump is working, but it may not be able to hold the pressure above the 30psi.
The fuel pump has a check valve that prevents fuel from flowing backwards into the tank when switch is off, if that is not working then system can't maintain pressure.
I would try to get a pressure test on the fuel rail, you can usually rent a pressure tester with the right fittings, you can by them for less than $50.

The PCM opens(fires) the injectors for a preset time based on the fuel rails "normal" pressure, 30-45psi, if psi is lower then not enough fuel is being injected, and it drips in instead of spraying, so very poor mix for starting.
After using the staring fluid to get engine started the air flow through the intake would be enough to suck dripping fuel into the cylinder so maintaining an idle could be possible and even raising RPM(injectors open longer).

I assume you drained the old fuel after setting for a year??
Or at least added a lot of new fuel
Old gas don't burn too good, lol.

 

[jhonny reb]

92 ranger wont start

hey guys i checked again when i turn my key on i can can hear my fuel pump but it does not shut off it just keeps running which i dont think is normal is it im thankful for any help on this