6.7 weird noise after shut down

Big Bad 6.4 · Sep 22, 2015

So my dad has a 2012 F-350, only upgrade motor wise is a S&B CAI. 30,000 miles, up to date on all fluids and filters, needless to say he takes very good care of this truck. For about the past 4 months when he shuts down there is a noise that sounds like the fuel pump running which typically lasts about 1-2 minutes and then stops with what I can best describe as a sucking or plunger type noise. We don't notice any leaks, power loss, codes, nothing.

Has anyone else heard of this or experienced it? Thanks in advance.

CallMeColt · Sep 22, 2015

I've been having the same noise with no apparent symptoms for 2 months.

Did some searching on here & found people saying it is a vacuum leak or waste gate solonoid.

Also read tapping the brake when it starts will stop it & it does...... to only come back a minute or two after! Was doing some gun repair in the garage & all the sudden..... bzzzzz.

Going to follow your thread & see who pops in with some good knowledge before I start buying uneeded parts. Go figure that my extended warranty ended a few thousand miles ago.

bad moose · Sep 22, 2015

It's the def pump sucking the def back into the tank so it doesn't freeze or cryatallize in the lines.

CallMeColt · Sep 22, 2015

Why would it all the sudden start making so much noise though? I have 140,000 miles almost & it never made the noise. Pump wearing out maybe?

bad moose · Sep 23, 2015

Maybe? I know I just started hearing mine at around 60 000 miles. Never noticed it before. I know all my sprayers with def do it and that's how I recognized the sound and length.

Big Bad 6.4 · Sep 24, 2015

So I was cruising the web and found this on ford-trucks.com Quote from ford-truckQuote:
"22508 ; 2011-2012 6.7L PICK UP TRUCK - BUZZING UNDER HOOD AFTER SHUTDOWN
SOME 2011-2012 F250-450 SUPER DUTY PICKUP TRUCKS EQUIPPED WITH A 6.7L DIESEL ENGINE MAY EXHIBIT A BUZZING NOISE FROM UNDER THE HOOD AFTER THE ENGINE IS SHUT OFF. THE BUZZING NOISE IS CAUSED BY NORMAL VACUUM BLEED OFF IN THE VACUUM SYSTEM RESULTING IN THE WASTE-GATE SOLENOID BUZZING. THIS NOISE NORMALLY LASTS FOR APPROXIMATELY 30 SECONDS. ENGINEERING HAS REVIEWED RETURNED COMPONENTS AND DETERMINED THIS IS A NORMAL VEHICLE CHARACTERISTIC. DO NOT ATTEMPT TO REPAIR THIS NOISE. CHASSIS CAB VEHICLES DO NOT APPLY TO THIS ARTICLE BECAUSE THEY ARE NOT EQUIPPED WITH WASTE-GATE.
EFFECTIVE DATE: 08-SEPTEMBER-2012"

CallMeColt · Sep 24, 2015

Cool. Guess I won't worry then.

Dzchey21 · Sep 24, 2015

Mine started doing it after my turbo swap. My dads 13 doesn't do it

Jomax · Sep 25, 2015

Mine does the clicking noise when off since new.

Sent from my SM-N900V using Tapatalk

CallMeColt · Sep 25, 2015

This is more than a click or quick buzz..... mine made those since day one. More annoying than anything.

lincolnlocker · Sep 25, 2015

Jomax said:
Mine does the clicking noise when off since new.

Sent from my SM-N900V using Tapatalk

same here! freeks people out.. kinda funny..

live life full throttle

CallMeColt · Sep 26, 2015

So I got out of my truck to unlock a gate today & heard the noise while the truck was just running. First I've noticed that.

lincolnlocker · Sep 26, 2015

CallMeColt said:
So I got out of my truck to unlock a gate today & heard the noise while the truck was just running. First I've noticed that.

pop the hood when its running. its loud.. very loud koeo with the hood up..

live life full throttle

6.0 Tech · Oct 3, 2015

Replacing the w as stegate harness per the tsb that was mentioned fixes the issue. If i remember correctly, the way the tsb calls out the failed part, it is warrantied under the diesel engine coverage which is 5/100. You could always have coverage checked by the dealer.

CallMeColt · Oct 3, 2015

I'm way past the factory & extended coverage. As long as it's nothing more than an annoying noise, I can tolerate it. Thanks though.

Kafn8td · Oct 4, 2015

My 12 just started doing it, 50k miles.

CallMeColt · Jul 10, 2016

Funny... I had gotten used to the noise. A few weeks ago, I noticed it stopped. Never had any issues because of it though.

joestroo · Jul 11, 2016

This happened to my truck a month or so ago, it was the waste gate vacuum line. Picked up the part and a had a buddy change it for me, no noise sense.

Bullet 21 · Jul 13, 2016

Mine still does it, even with the waste gate sitting in my shed....lol

BigJerm7 · Jul 15, 2016

There's another TSB that tells you how to fix it and gives you the part #. I replaced mine 3 months ago and it quit. Pretty easy. Just follow the wire and replace it. It's like a vacuum line. Mine is ******d and still did it.