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?
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.
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