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4.0L OHV & SOHC V6 Tech General discussion of 4.0L OHV and SOHC V6 Ford Ranger engines.

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Old 01-27-2013
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4.0 OHV Fuel issues

Alright, So i got to digging around on my truck to fix my check engine lights. see here

I ended up finding out my pressure regulator is stuck open. But here is where i'm stuck.
There is no return line in the OHV motor and Ford calls the part a Fuel Pressure Damper.
I know its the regulator because when i hooked up a gauge to the fuel line coming into the regulator and it holds steady pressure with key on and with it off it will still hold 30 pounds.

Now what i don't understand is how the fuel returns, because there is no return line. So i need to figure out what happens in the damper. because when i hook up a gauge to that, it holds high pressure even with the key off.
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Old 01-27-2013
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You won't find a return line on your truck, it is regulated in the tank. Lift the bed off, disconnect the fuel lines and wires, and unscrew the "lid" that holds the pump in the tank, then you can lift out the pump, regulator, and sender together. I haven't seen the regulator for sale alone, I'm sure it's available out there somewhere.
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Old 01-27-2013
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I ended up talking to Justin about it.

Ford calls the part (that i think is bad) the Fuel Dampner. Which isn't a regulator, but its vacuum powered.
It could either be a bad Dampner or it could be something dirty in the fuel rail.
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Old 02-05-2013
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Forgive my question here, but it may be of value. Isn't it normal operation for the fuel pressure to hold until you specifically bleed it? Let me know if you will. Thanks.
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Old 02-05-2013
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According to ford specs, Fuel pressure should hold at 60 and lose less than 15PSI in 30 minutes
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