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Old 08-04-2009, 05:07 AM
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ford triton whats normal fuel pressure?? help

I have a friend that has an 02 expedition, can someone tell me what fuel pressure readings are supposedto be? has a lean condition but i want to check fuel pressure? cant google and get an answer? need to know pressure rating?
thx
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Old 08-04-2009, 05:26 AM
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I think its supposed to be about 50 psi, lean codes will also be caused by a bad mass air flow sensor.
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Old 08-04-2009, 07:14 AM
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i read that. I found the pcv valve out o the valve cover. Still in the hose but not plugged in. Also seemed valve insides went bad. I put the pvc valve in the cover but plugged the hose. No vacuume leak anymore.(i hope andd assume) She's picking up a valve soon.
I had code po171 and p0174 lean banks 1 and 2. I thought maf too. It looks like it needs to be cleaned. I checked it out at her work. I had no cleaner there. I think the pvc will fix it
thanks

Last edited by melmount; 08-04-2009 at 10:12 AM.
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Old 08-04-2009, 07:42 AM
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Fuel pressure spec is 30 to 45 psi. unmetered air entering the intake such as an unplugged pcv valve will cause a lean codes.
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