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Fuel pump replacement on 99 navigator

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Old 07-19-2008, 12:05 PM
Jeffrey04 Jeffrey04 is offline
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Fuel pump replacement on 99 navigator

I could use some help on the "how to" of the fuel pump replacement on my 99 Navigator...thanks.
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Old 07-21-2008, 08:02 AM
gibsonj gibsonj is offline
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Are you real sure it's the FP? A lot of trouble and work to drop the tank if it happens to be a bad relay.
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Old 07-26-2008, 02:00 AM
Jeffrey04 Jeffrey04 is offline
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Not sure, my second opinion says the codes are showing bad O2 sensor on bank 1 and bank 2. It's hard to start when it's cold (having to pump it 2-3 times) and if it idles below 1000 RPM the idle is real rough and will only stablize if I manually raise the RPM's up to or a little over 1000.
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Old 07-26-2008, 11:05 AM
alloro alloro is offline
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1. If the codes are pointing to a bad O2 sensors then why in the world would you change the fuel pump? If the pump is in any way suspect, the first thing to do is take a pressure reading at the fuel rail.

2. You don't pump or even touch the pedal on fuel injected vehicles, only carbureted ones.

3. How long since it's had a tune-up, air filter, plugs, etc.?
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