1994 7.3 fuel problem!
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Mountain Pass
Joined: Mar 2002
Posts: 111
Likes: 2
1994 7.3 fuel problem!
Hi all, I bought a 94 F250 7.3 turbo IDI and the front fuel tank never worked. I noticed when I switched it to the front tank the fuel gauge would max out, so I bought a fuel tank selector valve and installed it. That's when I noticed the line from the front tank was full of kind of a tar substance and had the smell of real old diesel. I had to run a wire through the line back to the tank to get any fuel to come out with a fuel pump. My question is, will the tar substance eventually clean out with the diesel? I also put about 3/4 qt of type F transmission fluid in the tank to aid in cleaning. It will idle, but if I hold the throttle down about 3/4 of the way, it starts running out of fuel until I switch it back. Just idling it seem to do ok, the exh seems a little hot, but I'm not sure.
Oh, there are stickers on the back bumper saying bio diesel, so someone might have used that a while back.
What are your thoughts?
Oh, there are stickers on the back bumper saying bio diesel, so someone might have used that a while back.
What are your thoughts?
Logistics Pro
Joined: Jul 2009
Posts: 3,635
Likes: 3
From: Lansdale, PA
Your question is better suited in the diesel specific forum.
Who convinced you to use ATF in the fuel to clean the lines.
Is it a rubber line. If it's soft it could be sucking it closed. The pickup screen could be gummed up also. The line that was gummed up needs something like gasoline or solvent run through it, or just replace it. But diesel with ATF wont do what you are hoping.
You may want to drop that front tank and look inside it.
Who convinced you to use ATF in the fuel to clean the lines.
Is it a rubber line. If it's soft it could be sucking it closed. The pickup screen could be gummed up also. The line that was gummed up needs something like gasoline or solvent run through it, or just replace it. But diesel with ATF wont do what you are hoping.
You may want to drop that front tank and look inside it.
Cargo Master
Joined: Nov 2009
Posts: 2,364
Likes: 117
From: starship enterprise
It sounds like you have more problems than a math book. I would start by disconnecting the lines somewhere downstream, like fuel filter maybe and then putting a small amount of air pressure in one tank with a blow gun and a rag, just a little, and monitor what comes out. If it is a significant difference from the front tank to the rear tank in volume, then there is a restriction in the front tank, if not then look elsewhere. Another option is to monitor the pressure at the fuel system, somehow. Check the charge pressure at the pump and see if the pressure deteriorates when you switch tanks. I would make a few recommendations to you as well regarding this old fuel system, these rotary pumps are prone to failure with our new ultra low sulfur fuel. Add something to lubricate the parts internally and also try to avoid adding unleaded to the fuel that enters the pump. I learned from experience.
If you have a restriction in the fuel tank, reverse engineer the system until you correct it. The front tanks aren't too hard to pull in these unless it is full of fuel.
If you have a restriction in the fuel tank, reverse engineer the system until you correct it. The front tanks aren't too hard to pull in these unless it is full of fuel.
i ain't rite
Joined: Mar 2005
Posts: 65,505
Likes: 5,563
From: Marlboro Mental Hospital.
It sounds like you have more problems than a math book. I would start by disconnecting the lines somewhere downstream, like fuel filter maybe and then putting a small amount of air pressure in one tank with a blow gun and a rag, just a little, and monitor what comes out. If it is a significant difference from the front tank to the rear tank in volume, then there is a restriction in the front tank, if not then look elsewhere. Another option is to monitor the pressure at the fuel system, somehow. Check the charge pressure at the pump and see if the pressure deteriorates when you switch tanks. I would make a few recommendations to you as well regarding this old fuel system, these rotary pumps are prone to failure with our new ultra low sulfur fuel. Add something to lubricate the parts internally.
this is a proven false statement. all the lubrication your injector pump or injectors will ever need added to the fuel at the refinery.
also try to avoid adding unleaded to the fuel that enters the pump. I learned from experience.
why would you ever want to put unleaded gas into the diesel fuel system???
If you have a restriction in the fuel tank, reverse engineer the system until you correct it. The front tanks aren't too hard to pull in these unless it is full of fuel.
this is a proven false statement. all the lubrication your injector pump or injectors will ever need added to the fuel at the refinery.
also try to avoid adding unleaded to the fuel that enters the pump. I learned from experience.
why would you ever want to put unleaded gas into the diesel fuel system???
If you have a restriction in the fuel tank, reverse engineer the system until you correct it. The front tanks aren't too hard to pull in these unless it is full of fuel.
remove the lines from the fuel tanks and filter, and flush them clean.
if you can not get them clean, you may have to replace them.
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