My 2000 F250 Superduty V-10 has developed the following problem:

1st event, drove to work, parked for the day, came out to go home, initially started for a second then died.
Cranking fine, no start.

Checked the fuel pump fuse, good.
Banged on the bottom of the fuel tank, no start.
Checked the fuel rail schradder valve, no fuel.
Plugged in code reader, no codes.
Disconnected the battery to reset the computer in the event it was in a funny mode, reconnected and started right up.

Ran fine for a couple days, stopped to fill up one day and would not start again.
Disconnected and reconnected the battery and fired right up.

There is never an issue with not cranking over, only with whatever circuit / circuits are powering the fuel pump.

I have searched and found a lot of common threads on this subject but haven't found anyone who has simply been able to "reboot" the ECM ( if that is what I'm actually doing ) and make it start.

Is there some other control circuit downstream of the ecm that could go into a latched state and lock out the fuel pump ?

I have read about the roll over reset switch but that obviously in not the case with mine as I don't have to press a reset button.

Any insight is helpful, just don't say replace the fuel pump as how could that be the issue if just by disconnecting and reconnecting the battery makes it start ?

 

It sounds like a fuel delivery issue. When it will not start, do you hear the fuel pump kick on?

 

What Redford said. A bad relay could be getting a bump from the battery reconnect instead of the computer reset. I would check the connections at the relay and if OK, go ahead and replace the relay.

 

No, and it IS most definitely as fuel delivery problem, that has already been determined.
But, I also have never heard the pump run in this truck, unlike most other electric fuel pump equipped vehicles that I have owned.

Are you talking physical "bump" ? If so, I don't see how that is possible being that the relay is on the opposite diagonal corner or the engine bay from the battery, and no, I don't close the hood (bump) before starting it after reconnecting the battery.

So I'm still asking the question: Is there some other control circuit downstream of the ecm (besides the relay) that controls the fuel pump ?

Also, does the fuel pump run with only turning the key on like most cars or in this application does it need to see that the engine is cranking over before energizing the circuit ?

 

The fuel pump relay, like all such devices, is operated by a current passing through a coil, which causes an electromagnetic pull, physical closing the contact points. When you remove and reapply the power to the relay, it gives a physical "bump" to the relay points.

If you do not want to troubleshoot the relay circuit, you can check the voltage at the fuel pump to see if power is there.

The fuel pump should operate when you turn the key on.

 

Latest Update:

Today I located the fuel pump relay which contrary to what I thought was NOT in the engine bay.

I searched and read varying reports that it is located behind the radio, or to the right of the steering column. I found it to the right of the column behind the "crap catcher" pocket that is molding into the lower dash pane.

The relay block has the turn signal relay, the fuel pump relay and 1 more relay which is the same as the fuel pump relay. I swapped those 2 relays until I go buy a new one.

Question is, what is the OTHER relay for ??

 

Bueller.....Bueller.....anyone ??

 

Trailer running lamp relay.

 

Interesting, it seems that after they designed this electrical system someone came along and said, " where are we going to put the X, X,and X relays ? "

" Just stuff um under the dash somewhere, now get out of here. "

Thanks for the info

 

Summer project college intern's project, just like the trailer wiring packages for the 97 and 98 half-tons, would be my guess.