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fuel pump shuts off

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Old Jun 1, 2022 | 04:07 PM
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fuel pump shuts off
Have a 2008 F250 V10 gas. The fuel pump will work when you first start the truck up and after about 5 minutes it turns off. We have replaced the battery, replaced the fuel pump, fuel driver module, replaced the fuel rail sensor and still having the issue. The system has a good ground. We even reset the interia switch. We are now at a lost on what to try next. If you disconnect the driver module when the pump has turned off and reconnect it, the pump will turn back on but not for as long as when you turn the key off and back on.
 
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Old Jun 1, 2022 | 05:27 PM
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Is the pump quitting by itself or is it being commanded to turn off?
 
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Old Jun 1, 2022 | 05:32 PM
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So, as far as we can tell turning off itself. Had a voltmeter hooked up and you see when the volts drop it shuts off
 
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Old Jun 1, 2022 | 05:34 PM
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you see when the volts drop it shuts off
If the power is dropping, then the pump is not turning itself off. Power to it is being removed "upstream" from wherever you measured it (not specified).


 
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Old Jun 1, 2022 | 05:41 PM
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We measured from the connector at the fuel pump. Following the troubleshooting to see if it is from the positive or the negative. But what would shut the power off from it.
 
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Old Jun 1, 2022 | 05:55 PM
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Also the ground voltage goes up and then the pump shuts off
 
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Old Jun 1, 2022 | 06:46 PM
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Don't know exactly how it is supposed to run. Its different from mine.. The computer runs the module to deliver fuel as needed..as far as I know..
 
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Old Jun 1, 2022 | 06:52 PM
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Also the ground voltage goes up and then the pump shuts off
That doesn't make any sense.....

 
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Old Jun 1, 2022 | 09:06 PM
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Ground? What do you mean ground voltage?
There should be a ground on the frame back there somewhere. Do you have wiring drawings?
 
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Old Jun 2, 2022 | 07:41 AM
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Is your fuel tank/fuel pump chassis ground clean and tight?
 
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Old Jun 2, 2022 | 10:41 AM
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With all that stuff you replaced, did you test or replace the fuel pump relay?
 
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