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There's a little black petcock looking thing sticking out of the bottom that leaks.
Hey all. I'm new to the forums so if someone else has asked this question if you could drop a link. I've owned my 95 7.3 for 3 years now and I've always had some spots under the truck when parked. I know the old saying is if it leaks it has fluids but I'm not really keen on losing fuel. Recently I've noticed an excessive amount of fuel loss and upon investigation I found this little guy just poking out under the fuel pump hoses. It isn't spraying thankfully but it has a pretty steady drip, about two drops per three seconds. It doesn't look like a hose attaches to it and when I looked at another 7.3 it wasn't even there. I can't find anything about it online so I'm at a loss. Thanks for the help.
think thats the VAC switch leaking
Dont tighten it up too much as the bowl will crack
remove and add some pipe dope and insert again
or
plug port up with NPT plug
Just did one of mine yesterday. It's the fuel filter restriction light switch. Not really necessary if you change your filter regularly.
A 1-1/16" wrench will take it off but a short 1-1/16 oil pressure sending unit socketvis the proper tool. You'll have to remove the intake "y" to get to it.
I'ma fancy a guess you're talking about this.
Just pipe dope and dont over tighten like they said.
Since you gotta take it off, highly suggest just replacing all the fuel lines too. Just make sure they are diesel/fuel rated.
It's kind of a PITA to get it out, but its really not terrible.
you can do the fuel bowl heater removal as well if its still in there, which can be a source of grief. Just remember to unhook the IPR plug when pulling it, cause the fuel bowl harness plugs into the IPR as well.
The biggest PITA is to do the fuel lines.
You can probably do it while its in the truck thinking about it if you pull the turbo Y pipe off. just tape over the intake ports so you dont drop stuff in there.
So it's for sure the fuel filter restriction sensor thing, I looked it up and it's the exact part. I think I'll just plug it because I change my filter regularly at least once or twice a year. I've inspected the lines and hoses; they do look old but not the source of the leak. Eventually I plan on replacing the fuel lines and the pump but that will be a summer project when it isn't 20 degrees and windy as heck. Thanks everyone for the quick response!
Last edited by BobaFettTheCenturion; Dec 22, 2023 at 11:49 AM.
I had the passenger fuel line burst on me about 70 miles from home. Fuel just sprayed out when truck was running that I could see the fuel gauge slowly dropping to E! Made to a parking lot near an auto parts store. Of course they didn’t have the part. Luck it was the passenger since it’s way easier to replace than the driver’s side. Ended up sleeving the cracked line with heater hose and several worm clamps. Slowed the leak enough to get home. Ordered the steel braided from riff raff along with a fuel bowl/fpr rebuild kit, new fuel pressure spring, new bowl heater because mine had slightly separated and new hoses/clamps. Took it all out, rebuilt it and back in.
watched it for couple days and noticed there was a slow leak. It was coming from the fuel resistor. Of course one of the only parts I didn’t replace. On my 95 it was a huge pain to get in while the bowl is in place! Its position is under the bowl and in the back near the fuel pump. Learned a lesson to try and replace as many parts within the same system, at the same time. The parts can age the same and when you change something and it runs to spec the older parts in the system really start to show their ware fast.
