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Crank no start

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Old Oct 29, 2025 | 07:59 AM
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Lubeking's Avatar
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Default Crank no start, fuel pump relay info?

Hi I have a sudden crank no start issue on my 2015 3.5L xlt fx4 . Just would not start on a morning and that was it. ODBII code P00C6. I do not hear the fuel pump turn on. I have already substituted the fuel pump relay and fuse. I have also replaced the fuel pump module that is located near the spare tire. What I would like to do at this point is bypass the relay to activate the fuel pump directly before ordering a new fuel pump. Anyone have the pinouts for the 8T2T relay or information on what pins need to be shorted to activate the fuel pump? or is the fuel pump module a better spot to activate the pump?
Fuel Pump Relay
Fuel Pump Relay
Last thing I want to do is fry the ecm or anything else.

Last edited by Lubeking; Oct 29, 2025 at 09:37 AM.
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Old Oct 29, 2025 | 05:02 PM
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Wicked ace's Avatar
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That is a common relay and probably a few others like it in the power block. Why not swap one out to try. Put your finger on it while someone turns the key to feel if it clicks. A new one is $8-$10.
A different problem but related thread:https://www.f150forum.com/f118/8t2t-...stions-503073/
If you want to put a jumper to try to run the pump Pins 3 & 5 are switched so jump those to power it. Diagram below.



Last edited by Wicked ace; Oct 29, 2025 at 05:09 PM.
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