P0627
9/29/21 | 05:09 PM
#1
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Joined: September 29, 2021
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P0627
Hello, looking for some input i have a p0627 code and cant figure it out fuse 13 looks good i also swapped both fuel pumps (fore double pump) i swapped the relay in the trunk and cant figure it out any input would be appreciated. i apologize if i posted in the wrong forum
9/30/21 | 09:57 AM
#2
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Joined: February 2, 2004
Posts: 7,582
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From: Insane
Welcome to the forums! 
I'm assuming that you have a 10-14 Mustang...?
You didn't specify, but since you're posting here, that's what I got to go with...
If you've swapped out the fuel pump, the fuse is ok, relay is ok, then the two things left is wiring and computers. Wiring is... well, it's gonna be fun, but you just have to do the diagnostics on whether the wires involved are good or not, top to bottom, front to back, side to side. Resistance shouldn't be high on the bare wires. Ensure voltages are correct. That sort of thing. Grounds that have come loose and/or corroded could be it, as well as any corrosion of the wiring in general.
Once you've eliminated everything else and the wiring, the computer(s) involved are the suspects, there's nothing much else left. I mean, there could be some esoteric thing I can't come up with, but that's what you get from waaaaay over here armchair diagnosin' on them intarwebs.
You'll want to get a shop manual for your car, however you go about that (Ford, Service Data, etc), and it will need to have the diagnostics and wiring diagrams in it. And you'll want tools like a multimeter, possibly a test light and/or power probe, and a scan tool (NOT a code reader, won't help here.) For the scan tool, there's various ones out there, including the free Forscan software you could try, but you'll need to acquire the OBDII cable they suggest for complete compatibility. I've not yet used it as of this writing, but I do actually have this stuff and one day I'll be tryin' it out. Otherwise you're looking at, oh, Autel or something and it ain't gonna be cheap. You need one that can properly ask all the modules and get all the live data and even do particular tests is the key though. Not just any scan tools will do this stuff.
I know that's not all that helpful at the end, certainly not necessarily what you wanna hear, but that's the deal. You can do all that, or you can take it to a mechanic who's set up to do this for your car. You've shotgunned parts and time at it already, so it's your choice at the end.
I still hope it helps, and good luck!
I'm assuming that you have a 10-14 Mustang...?
You didn't specify, but since you're posting here, that's what I got to go with...If you've swapped out the fuel pump, the fuse is ok, relay is ok, then the two things left is wiring and computers. Wiring is... well, it's gonna be fun, but you just have to do the diagnostics on whether the wires involved are good or not, top to bottom, front to back, side to side. Resistance shouldn't be high on the bare wires. Ensure voltages are correct. That sort of thing. Grounds that have come loose and/or corroded could be it, as well as any corrosion of the wiring in general.
Once you've eliminated everything else and the wiring, the computer(s) involved are the suspects, there's nothing much else left. I mean, there could be some esoteric thing I can't come up with, but that's what you get from waaaaay over here armchair diagnosin' on them intarwebs.
You'll want to get a shop manual for your car, however you go about that (Ford, Service Data, etc), and it will need to have the diagnostics and wiring diagrams in it. And you'll want tools like a multimeter, possibly a test light and/or power probe, and a scan tool (NOT a code reader, won't help here.) For the scan tool, there's various ones out there, including the free Forscan software you could try, but you'll need to acquire the OBDII cable they suggest for complete compatibility. I've not yet used it as of this writing, but I do actually have this stuff and one day I'll be tryin' it out. Otherwise you're looking at, oh, Autel or something and it ain't gonna be cheap. You need one that can properly ask all the modules and get all the live data and even do particular tests is the key though. Not just any scan tools will do this stuff.
I know that's not all that helpful at the end, certainly not necessarily what you wanna hear, but that's the deal. You can do all that, or you can take it to a mechanic who's set up to do this for your car. You've shotgunned parts and time at it already, so it's your choice at the end.
I still hope it helps, and good luck!
9/30/21 | 10:20 AM
#3
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Joined: January 25, 2010
Posts: 3,875
Likes: 1,598
From: Massachusetts
based on user name, I'm guessing he has a 2011-2014 Mustang with Coyote engine, with a Paxton supercharger on it; which would explain the "fore double pump" setup ; and that probably has something to do with it, since that is not the stock setup
so first question I would have, if houtex post above hasn't already addressed it: when did this issue start? immediately after you installed the supercharger and dual pump system?
so first question I would have, if houtex post above hasn't already addressed it: when did this issue start? immediately after you installed the supercharger and dual pump system?
Last edited by Bert; 9/30/21 at 10:22 AM.
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