Our Community is 705,000 Strong. Join Us.


1999 Navigator Fuel Pump


hflyboy
07-08-2006, 04:57 PM
A couple of weeks ago my Navy seemed a little down on power (though it ran smoothly enough) and the check engine light came on. After I got home, I turned the key on to pull the daignostic codes and heard the fuel pump emit a short series of squeaks as though it were turning slowly. The Codes were P0171 and P0174, and the long term fuel trims were pegged at 25%which combined with the noisy pump led me to think the fuel pump was bad. I was too tired to deal with it then, and let it sit overnight. The next morning, the pump sounded normal! I cleared the codes, repaired a small PCV leak and since then every thing is great, fuel pressure up to specs, no more codes. I mentioned all this to a mechanic buddy of mine, and he said any Navy fuel pump with with over 100,000 miles is living on borrowed time. SO....I've got a new pump on order just to address the "confidence" factor. I've taken the tank out and removed the old fuel pump/sending unit module. It looks fine, the sock isn't clogged and no discernible debris or trash in the tank.

carlos80
07-09-2006, 12:16 PM
A couple of weeks ago my Navy seemed a little down on power (though it ran smoothly enough) and the check engine light came on. After I got home, I turned the key on to pull the daignostic codes and heard the fuel pump emit a short series of squeaks as though it were turning slowly. The Codes were P0171 and P0174, and the long term fuel trims were pegged at 25%which combined with the noisy pump led me to think the fuel pump was bad. I was too tired to deal with it then, and let it sit overnight. The next morning, the pump sounded normal! I cleared the codes, repaired a small PCV leak and since then every thing is great, fuel pressure up to specs, no more codes. I mentioned all this to a mechanic buddy of mine, and he said any Navy fuel pump with with over 100,000 miles is living on borrowed time. SO....I've got a new pump on order just to address the "confidence" factor. I've taken the tank out and removed the old fuel pump/sending unit module. It looks fine, the sock isn't clogged and no discernible debris or trash in the tank.
have you ever bothered to check the fuel filter?

hflyboy
07-09-2006, 01:47 PM
I replaced the fuel filter 3,000 miles ago.

Add your comment to this topic!