I have a 2000 X with the 6.8L V10 and a little over 163,xxx miles. I was stranded for the first time the other day and had to get a tow. Engine turned over fine, but wasn't getting any fuel. I listened for the fuel pump to come on when my wife turned the ignition, but it would only come on for a split second. I checked the relay, fuse, and emergency cut-off and all seem to be working properly. I dropped the tank and installed a new fuel pump and then a fuel filter. After reassembly, it fired right up. I drove it to church and then home again with no problems. The next day, I went to start it and it was doing the exact same thing it did before I changed the fuel pump and filter. I checked the relay, fuse, and emergency cut off again and all seem to be working properly. I dropped the tank and pulled the new fuel pump out and jumped it off of a battery. It ran like it should. I checked the voltage at the tank and it was only reading around 6.5 volts. I hooked up the pump to the electrical connector at the tank and then pulled the relay and used a jumper wire to bypass the relay. The pump purred like a kitten. I swapped the relays again with three 'known to be good' relays and it's still only reading around 6.5 volts at the tank. I'm at a loss as to what to try next. I think the PCM is closing the relay for a split second, but then opening it back up before the pump has a chance to pressurize the fuel lines. Could there be a bad ground wire somewhere? Is the anti-theft system acting up? Is the PCM bad? Thanks in advance for your help.

 

Where is the fuel pump relay located?

Maybe check and clean the metal contacts where the relay plugs into?

 

I have the same exact problem on my 2000 Excursion. What did you end up finding was the problem?

 

Did you ever get this resolved?

 

most likely his fuse box burned which is a common failure in ex and super duty and just happened the fuel pump relay is in the fuse box

 

Timely post, mine is doing the exact same thing, guess l'll check it out before buying the new pump. Is the voltage supply to the pump modulated or full system voltage? Thanks.

 

On a 2000 Exc, it's "full" battery voltage.

I recommend pulling the kick panel cover on the passenger side and connecting a test lamp to the pump power wiring at the inertia switch. That way you can tell if the control system is working or not.

 

Are these returnless systems where they run voltage up to increase to increase pressure? I thought most ford were by 99

 

Some cars were that early (my 2000 Conturd is), half-ton pickups went return-less for the 2004 NBS models, and the Super Duty trucks went return-less for the 2005 MY. The 2005 Excursion with the gas engines never went return-less, according to the factory service manuals. If someone has an Excursion that is return-less, it would be interesting to know about it.

 

Ok. That's interesting they never employed that on the bigger x. My 01 explorer 5.0 is returnless. Learn something new everyday.
Definitely check voltage through the inertia switch.