Question about 2003 Ford Expedition

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Looking for the fuel pressure specification on 2003 expedition. Truck hesitates while driving, at times the dash chimes and battery light comes on /off quickly and continues.

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  • kylesit Jul 15, 2009

    Benjamin -

    would any of the mentioned items be intermittent? Today while driving home as I reached 20 miles an hour the front end was shaky and the rpms were right about 1. When I got home I put truck in park and stepped on the gas.... it then stalled. I waited a moment and it restarted fine.



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Normal fuel pressure for your vehicle is 30 to 45 psi.

What you are concerned with is pressure bleeding off after the engine is shut down; if you shut the engine off it should still be showing the same or very close to the same pressure after a couple hours of sitting. If it does not, fuel pressure is being lost through a faulty fuel pump, faulty pressure regulator, leaking injector, or an external leak in the system somewhere...

If pressure is bleeding down, try clamping the fuel supply line shut immediately after shutting the engine off. This will tell you whether or not pressure is being lost back through a worn pump.

If this does not stop the pressure loss, then repeat the test and clamp off the fuel return line. If this stops the pressure loss, then a leaking fuel pressure regulator is the cause.

What it otherwise sounds like is a loose connection in the electrical system otherwise like you may not be getting the power needed to the pump.


Posted on Jul 13, 2009


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High temp low oil pressure light comes on after driving for a few minutes, then off when engine at driving rpm. At stop light (idle or low rpm) light comes back on. Normal driving it goes out.

You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.

The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.

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This is going is going to take a diagnostic machine to be wired into the truck and taken on a road test.

About all I can suggest before doing that is to have the battery checked. Sometimes a cracked battery plate can float inside a battery and short.

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