F-250 6.7 Powerstroke low fuel pressure - Trapperman Forums

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F-250 6.7 Powerstroke low fuel pressure #7348579 09/05/21 07:21 PM 09/05/21 07:21 PM
Joined: Mar 2013 Posts: 17,023 Fredonia, PA. Finster OP trapper
Finster OP trapper Joined: Mar 2013 Posts: 17,023 Fredonia, PA.	So, switched fuel filters today on my '16 F250 6.7 powerstroke. Took it out for a drive and got low fuel pressure flashing and it threw a code. No need for anyone to try and figure this out. I fixed the problem. I didn't have the frame rail filter housing tight enough and apparently it was sucking air. However, here's my question. The fuel is pressurized in the tank by the pump. It is then sent to the frame rail filter then to the filter on top of the motor . Why, if the rail filter isn't tight enough, is the system sucking air and not spewing out fuel? Doesn't make any sense. P.S. I HATE MODERN VEHICLES! Last edited by Finster; 09/05/21 07:25 PM. I BELIEVE IN MY GOD, MY COUNTRY AND IN MYSELF.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348687 09/05/21 09:02 PM 09/05/21 09:02 PM
Joined: Mar 2013 Posts: 17,023 Fredonia, PA. Finster OP trapper
Finster OP trapper Joined: Mar 2013 Posts: 17,023 Fredonia, PA.	ttt I BELIEVE IN MY GOD, MY COUNTRY AND IN MYSELF.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348700 09/05/21 09:19 PM 09/05/21 09:19 PM
Joined: Feb 2014 Posts: 725 western Oklahoma D Davisfur trapper
Davisfur trapper D Joined: Feb 2014 Posts: 725 western Oklahoma	It's because it doesn't have a pump in the tank. The frame mounted filter is also the in line pump. That filter filters diesel from the tank feeding the pump and then the top filter filters the diesel from the pump to the injection pump. Least that's what they taught in Ford diesel class.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348726 09/05/21 09:56 PM 09/05/21 09:56 PM
Joined: Aug 2010 Posts: 10,817 Asheville, NC C charles trapper
charles trapper C Joined: Aug 2010 Posts: 10,817 Asheville, NC	Pressure is from the injector pump on Diesels, isn’t it?

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348761 09/05/21 11:03 PM 09/05/21 11:03 PM
Joined: Apr 2007 Posts: 2,312 venango county,pennslyvania minklessinpa trapper
minklessinpa trapper Joined: Apr 2007 Posts: 2,312 venango county,pennslyvania	its a ford! they had a better idea! life member Pennsylvania trappers life member vfw member fta

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348774 09/05/21 11:46 PM 09/05/21 11:46 PM
Joined: Jun 2018 Posts: 4,761 Beatrice, NE L loosegoose trapper
loosegoose trapper L Joined: Jun 2018 Posts: 4,761 Beatrice, NE	The fuel filter assembly has a pump integrated into it. It's just a "lift pump" that sends fuel to the engine. The engine itself had a system to then pressurize the fuel to a much higher pressure for injection into the cylinder.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348775 09/05/21 11:48 PM 09/05/21 11:48 PM
Joined: Dec 2013 Posts: 14,860 Greene County,Virginia R run trapper
run trapper R Joined: Dec 2013 Posts: 14,860 Greene County,Virginia	Modern Diesels tend to be complex. wanna be goat farmer.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348805 09/06/21 06:41 AM 09/06/21 06:41 AM
Joined: Dec 2006 Posts: 21,699 Sandhills Nebraska G Gary Benson trapper
Gary Benson trapper G Joined: Dec 2006 Posts: 21,699 Sandhills Nebraska	It was used too much when it was new. Life ain't supposed to be easy.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348806 09/06/21 06:42 AM 09/06/21 06:42 AM
Joined: Dec 2008 Posts: 3,903 eastern WV R Ridge Runner1960 trapper
Ridge Runner1960 trapper R Joined: Dec 2008 Posts: 3,903 eastern WV	the lift pump in diesels runs at about 8# pressure, the pump was pulling fuel through the filter, so it was sucking a bit of air, but still moving fuel. RR

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Davisfur] #7348853 09/06/21 08:37 AM 09/06/21 08:37 AM
Joined: Mar 2013 Posts: 17,023 Fredonia, PA. Finster OP trapper
Finster OP trapper Joined: Mar 2013 Posts: 17,023 Fredonia, PA.	Originally Posted by Davisfur It's because it doesn't have a pump in the tank. The frame mounted filter is also the in line pump. That filter filters diesel from the tank feeding the pump and then the top filter filters the diesel from the pump to the injection pump. Least that's what they taught in Ford diesel class. Humph! That answers that question. Thanks. It sounded like it was coming from the tank but kind of hard to pinpoint when you are sitting in the cab turning the key and I just assumed it was in the tank since most gas powered cars have it that way. I BELIEVE IN MY GOD, MY COUNTRY AND IN MYSELF.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7348968 09/06/21 11:36 AM 09/06/21 11:36 AM
Joined: Feb 2014 Posts: 725 western Oklahoma D Davisfur trapper
Davisfur trapper D Joined: Feb 2014 Posts: 725 western Oklahoma	I understand finster. The sound can be deceiving. I'm pretty sure they told us in school that a electric pump inside a diesel tank was just a bomb waiting for a place to go off but then I'm pretty sure dodge put thiers in the tank so I don't know. I know there is a reason why Ford doesn't put it in the tank like on gas vehicles because in tank is easier for assembly so there must be something to it.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Davisfur] #7348980 09/06/21 12:00 PM 09/06/21 12:00 PM
Joined: Mar 2013 Posts: 17,023 Fredonia, PA. Finster OP trapper
Finster OP trapper Joined: Mar 2013 Posts: 17,023 Fredonia, PA.	Originally Posted by Davisfur I understand finster. The sound can be deceiving. I'm pretty sure they told us in school that a electric pump inside a diesel tank was just a bomb waiting for a place to go off but then I'm pretty sure dodge put thiers in the tank so I don't know. I know there is a reason why Ford doesn't put it in the tank like on gas vehicles because in tank is easier for assembly so there must be something to it. Yea, I don't know why they ever started putting pumps in tanks to begin with. It was always a stupid idea as far as I'm concerned. I'm glad mine is on a frame rail. I used to replace fuel pumps on cars at my fathers garage back in the day. I was always a little nerve racking dropping a tank with fumes all over the place. Even if you could siphon most of the fuel out, you never got it all out. Naturally, 9 out of 10 times, the customer had 1/2 to a full tank of gas also. I know a guy who was burned horribly back in high school welding under a car when the tank went up. I saw him decades later and he was still getting skin graphs. He never did look the same obviously. I BELIEVE IN MY GOD, MY COUNTRY AND IN MYSELF.

Re: F-250 6.7 Powerstroke low fuel pressure [Re: Finster] #7349175 09/06/21 06:03 PM 09/06/21 06:03 PM
Joined: Dec 2006 Posts: 8,327 NWWA/AZ Vinke trapper
Vinke trapper Joined: Dec 2006 Posts: 8,327 NWWA/AZ	FASS all the way Slightly used Shoes 4 sale……………

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