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Old 03-27-2010, 09:13 PM   #1
Rustydawg
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Default Crazy high fuel pressure (50-60lb) on '02 3L

Guys

I was working on my buddy's 2002 3.0L Ranger today, we changed the fuel filter on spec then took it for a ride to see if a hesitation was cured.

I think the problem is worse now. I put a gauge on the fuel rail and we're seeing between 50 - 60 psi, and pulling / applying manifold vacuum at the pressure regulator doesn't move the pressure at all. It bumps it around a bit, but no real change.

Manifold vacuum is pretty solid at about 17".

Sounds like a shot fuel pressure regulator to me, but I haven't worked on this newer stuff. With my '92 I would expect around 45 psi and it should drop a bunch with manifold vacuum applied.

To make matters worse, it looks like the regulator is part of the fuel rail?? What were they thinking?

I think the regulator is shagged - is this a common problem? Anyone seen anything similar on a similar vintage 3.0?

Thanks
Russ.
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Old 03-27-2010, 09:25 PM   #2
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You should be at 30-40 psi...sounds like the regulator to me.

Your injectors still are using the same open/close time so the engine is getting too much fuel---hence the running like poo problem.
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Old 03-27-2010, 09:26 PM   #3
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Completely normal.

Fuel Pressure for a 2002

Key on, engine off 414-448 kPa (60-65 psi)
Engine running 414-448 kPa (60-65 psi)

Fuel pressure is controlled by the fuel pressure regulator which is mounted to the fuel pump bracket within the fuel tank.
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Last edited by Sasquatch_Ryda; 03-27-2010 at 09:28 PM.
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Old 03-27-2010, 09:32 PM   #4
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50-60 is about right for the ranger 3.0
my 98 run great at 72psi
and my co- workers and i have checked a dozen+ times and it is in spec

i just checked mitchell1 maluals and they say 56-72(gas) 47-63(flex fuel)
hope this helps
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Old 03-27-2010, 09:39 PM   #5
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The specs I posted are out of the Ford shop manual.
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Old 03-27-2010, 09:54 PM   #6
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i will listen to a ford manual before mitchell
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Old 03-27-2010, 09:57 PM   #7
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Hmmm.... OK.

So the fuel pressure we're seeing is within spec.

What's the point of what appears to be a bypass regulator on the fuel rail? It is connected to what I assume is manifold vacuum.

I notice that the fuel filter has three fittings on it, so I can buy that the pressure regulator is in the tank and the rail is maintained at 65 lbs or so. But what is this device with the vacuum line then?

Can I assume that fuel rail pressure is supposed to remain constant under all conditions - so long as the engine is running?

Thanks for the feedback - I'm learning something here...

EDIT - Woah, I'm getting ahead of myself. My gauge reads 60 lbs full scale and we never saw it touch 60.

Last edited by Rustydawg; 03-27-2010 at 09:59 PM. Reason: just because
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Old 03-28-2010, 02:00 PM   #8
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hrmm...I apologize if that spec I gave was wrong, I just grabbed the info from:

http://www.therangerstation.com/tech...rformance.html

I'd have to check at work tomorrow, but I mean enough people say that's in normal range that I'd tend to believe that link above is wrong.
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Old 03-28-2010, 02:32 PM   #9
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I think I have some of the fuel system figured out. The problem is I'm used to an old-school return system with the bypass regulator on the fuel rail.

This newer stuff has a regulator at the pump to deadhead about 60 lbs delivered to the fuel rails, and they are further regulated at the rails relative to intake pressure.

I don't think we're looking at a fuel delivery problem. The hiccup is right around the time the auto trans kicks down a gear, or shortly after. Then it will rev right up to the shift point and carry on.
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Old 03-29-2010, 07:12 AM   #10
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Quote:
Originally Posted by Rustydawg View Post
Hmmm.... OK.

So the fuel pressure we're seeing is within spec.

What's the point of what appears to be a bypass regulator on the fuel rail? It is connected to what I assume is manifold vacuum.

I notice that the fuel filter has three fittings on it, so I can buy that the pressure regulator is in the tank and the rail is maintained at 65 lbs or so. But what is this device with the vacuum line then?

Can I assume that fuel rail pressure is supposed to remain constant under all conditions - so long as the engine is running?

Thanks for the feedback - I'm learning something here...

EDIT - Woah, I'm getting ahead of myself. My gauge reads 60 lbs full scale and we never saw it touch 60.


On the fuel rail is a fuel pressure damper. It reduced occillations in the pressure which are common when the regulator is in the tank. It does not "regulate" anything.
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