7.3 Running rich ??
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Laughing Gas
Joined: Aug 2010
Posts: 1,098
Likes: 6
From: Ventura co.
7.3 Running rich ??
lately my truck has smelled stronger than normal. Today i looked and my exhaust is black, and even black around the outside of the pipe.
I have never seen it that black...
Can these things run rich ?? what do i need to look for ??
I have never seen it that black...
Can these things run rich ?? what do i need to look for ??
Cargo Master
Joined: Oct 2007
Posts: 2,712
Likes: 107
From: BoCoMo
Does sound (look) like a lot of unburned fuel in a cylinder or two. Does it start fine, run fine or rough? You may have one of your harnesses coming loose.
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Laughing Gas
Joined: Aug 2010
Posts: 1,098
Likes: 6
From: Ventura co.
yes its black. not dark black, but black. it was way over due to get changed.
Did finally do the fuel bowl o-rings today. the valley had puddles in it all the way down. thought that i had another oil leak. after cleaning it up. it was fuel..
Did finally do the fuel bowl o-rings today. the valley had puddles in it all the way down. thought that i had another oil leak. after cleaning it up. it was fuel..
Posting Guru
Joined: Jan 2007
Posts: 2,364
Likes: 3
From: Gilbert Az.
Black fuel filter is the first sign of a failing o-ring you're gonna want to get on that really quick, before you start burning all you're engine oil!
Jim & fat Monty
Jim & fat Monty
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Laughing Gas
Joined: Aug 2010
Posts: 1,098
Likes: 6
From: Ventura co.
Im assuming there is a return line to the fuel bowl from the head if this is happening ??
Also, I have been fooling around with my A.E. trying to figure it out. Did find and do the Buzz test on the injectors. All sound loud and the same..
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Posting Guru
Joined: Jan 2007
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From: Gilbert Az.
Not a return line just extremely high oil pressure working against low fuel pressure will cause the oil to travel the reverse direction within the fuel lines and rails untill it returns to the fuel bowl and eventually tank!
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Laughing Gas
Joined: Aug 2010
Posts: 1,098
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From: Ventura co.
REALLY.... Wow. So if its fighting the forward flow of fuel, at top RPM, I would actually be losing fuel pressure ?? Is this why i feel lately my truck kinda feels flat'er than normal on Higher rpm's ??
New User
Joined: Jan 2019
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1999 F350 7.3 running rich - Check your thermostat
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