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#1
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On pressurizing fuel tank to find leaks.
I suspect I have a pinhole leak somewhere in the fuel hard lines. Intend to unbolt them and check under the rubber but if it's a true pinhole, I don't suspect I'll see anything.
Remember reading someone suggesting pumping air into the tank. I imagine clamping off the vent, the intake line and connecting the return line to a pump would be sufficient. What's a safe PSI to reach? Or is this a bad idea in general? --
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1981 240D 4sp manual. Ivory White. |
#2
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I have heard the outlet from a wet dry vac directed into the fuel filler is enough pressure but won't damage anything.
I would hesitate to put a lot of pressure, but anything under about 5psi would be safe I think, as the aluminum pontoons on boats I work on tend to be pressurized to around 3-4psi for leak testing. Hopefully someone with more experience chimes in, I'm curious about this too.
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1982 300D (w123, "Grey Car") 1982 300D (w123, "Blue Car") 2001 Ford F150 "Clifford" (The Big Red Truck) 1997 Dodge Ram 2500 12V Cummins 1996 Dodge Ram 2500 12V Cummins Previous Vehicles: 1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion |
#3
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Smoke machine....
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#4
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Figured I could use a motiv pressure bleeder pumped to a few psi.
Suppose it’s also possible to affix to the fuel neck -which now that I think about it makes a bit more sense- or via an old fuel cap.
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1981 240D 4sp manual. Ivory White. |
#5
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Be careful to keep the pressure known, low and under control. A coworker put unregulated air pressure on a tank and didn't even have the filler neck sealed tightly; yet, it instantly ruptured the tank.
Good luck!!!
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"Rudeness is a weak man's imitation of strength" - Eric Hoffer |
#6
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Quote:
Degreasing the lines and then checking could work. It is likely under one of the camps (this happened to me). Either the Rubber wears out and the tubing rubs a hole in itself or it rusts under the clamps.
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84 300D, 82 Volvo 244Gl Diesel |
#7
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Quote:
As far as I can tell, I’m not leaking fuel. When I’m driving, it’s all suction. After a full night and the suction has dissipated (and I lose a bit of prime), would be the only time it could conceivably leak any fluid.
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1981 240D 4sp manual. Ivory White. |
#8
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How do you know that you're losing prime?
I'd probably just degrease everything, run it, then let it sit for a while. If not that, then use some dye in the tank and do the same |
#9
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Quote:
This is a long running saga and literally the last thing to check... -
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1981 240D 4sp manual. Ivory White. |
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