Why does my truck "Quack" ?

**Dawgfever** · 07-15-2019, 08:50 PM

Ford F-350 6.7 diesel. When I turn it off, exit the cab, about the time I get to the rear of the truck....it quacks. Just like a duck. One, single, solitary, ...Quack! Anybody got a clue????

(Actually quite humorous)

Ed

**Country Campers** · 07-16-2019, 05:00 AM

Not touching this with a 10 foot bill.

Brian

**BeerBrewer** · 07-16-2019, 06:26 AM

Originally Posted by Country Campers

Not touching this with a 10 foot bill.

Brian

OMG...Too funny!

I'd be willing to bet the quack noise is coming from the fuel tank or fuel system. Could be a vent be sticking or clogged and you are hearing air rushing in. Maybe it's air or small amounts of fuel or air escaping from one of the fuel filters or fuel lines releasing some of the pressure now that the truck is off. Just a thought.

**J&J___** · 07-16-2019, 06:53 AM

Originally Posted by Dawgfever

Ford F-350 6.7 diesel. When I turn it off, exit the cab, about the time I get to the rear of the truck....it quacks. Just like a duck. One, single, solitary, ...Quack! Anybody got a clue????

(Actually quite humorous)

Ed

Ed,

I have a 2012 F250 6.7, no quack but a few seconds after it is turned off I can hear a pressure release. It has always done it.

Jamie

**D2Reid** · 07-16-2019, 09:52 PM

I am having so much fun right now coming up with ridiculous answers, but I will be nice, haven't a clue.

**315RLTSinPA** · 07-19-2019, 02:49 PM

Most likely the DEF being purged from the lines.

**Walaby** · 07-19-2019, 03:09 PM

Wow... out of sheer curiosity I googled quacking noise, Ford Diesel. Here's a whole thread about it

https://www.powerstroke.org/forum/ge...uck-quack.html

There is apparently even a TSB about it.

Mike