Have a 2004 nissan armada pathfinder.. The service engine soon light comes on and then flashes.. I had a mechanic check it and put a new fuel pump in it( computer says fuel lean) but the light is still on.. the vehical is running find but the light is still on and worries me

It means time for a service.
Take it to your Nissan dealership for service.

Check all earths are clean & tight

Nissan Armada slip light Questions & Answers - Fixya

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I had the same problem since May with my 2006 Nissan Pathfinder brough it to my dealer 4 times during the course if 3 mos. Then I finally called Nissan Consumer and filed a complaint. Since this was due to a recall that was done to my car, there was no charge. They had to put a whole new fuel gauge sensor. I suggest to take it to a Nissan dealer because there is a recall for Fuel Gauge faulty reading that was put out in March or so 2010, so your car would qualify for the recall at no cost to the customer.

The fuel level sensor is at fault and is setting the service engine soon light on. Your local Nissan dealer can repair this under warranty depending on your mileage. The fuel tank will need to be removed to access the sending unit.

Take it and have the codes extracted most parts places will do it for free .I know autozone will.

flashing normally means some kind of severe missfire you need to get the code pulled to know what direction to go in you can also try checking fuel pressure

well a flshing engine light usually means multiple misfires witch indicates its time for a tune up if tune up has alredy been done check fuel pressure and injectors for leaking