my valve isn't operating correctly: it allows flow in both directions. I think explains why the truck's exhaust smells like it's running rich. not sure if I can just replace the valve because, I don't know what the flow rate is.
A wrecker yard or some of the guys on the forum. Will Tillery may have one. They are a pain to get to but if the truck is going to the dump you can just cut the panel and get right to it.
It looks like it'd be on a pre advanced evap disco, 94-97 or so. But it's part of the fuel filler, so it doesn't list the same part number to cross reference. Does look similar though.
I found this thread when researching the evap parts of the fuel system needed to do an overhaul of the system. It looks like the roll-over vent valves on top of the tank are the same as a Jeep, Dodge, etc. (I haven't bought one yet to confirm). The part number for the valve is 5360058 (or Dorman 911-060) and the grommet is 52018823.
It looks like the vapor separator can be fixed up by replacing the pressure relief valves, which according to the workshop manual open between 5 and 7 Kpa, 0.7 and 1.0 psi. With some research I'm sure we can find a suitable replacement.
Maybe one of these will work. They have a cracking pressure of 0.5 psi.
It looks like the Toyota FJ40 has a very similar fuel vapor separator so the system used on our Defenders is very archaic. The Toyota pressure relief valve is part number 90917-10020. (pix in this thread)
Oh, here we go. I didn't look hard enough. The pressure relief valve is LR part # NTC7567. It looks like it is also included on the vapor separator to atmosphere tube for the Disco 1: NTC7493. It looks like some of those Disco 1 parts are being made again under the new Classic parts division.
The fuel level needs to remain below the top of the stock fuel tank. Too much fuel in the extended tank will force fuel vapor out of the pressure relief valves.
Makes sense. But what a waste of the fuel tank. Kinda doesn’t make sense to have it if it only expands that capacity by a few gallons. I appreciate the note back!
Absolutely. You can carefully cut one off an early Disco 1 filler neck. That's what I did. Then I got a piece of black solid plastic rod. I think 3/4" diameter. Cut off a couple pieces, drilled a hole in them for the screw and epoxied them to it using the original as a reference. After it's installed it looks identical to the original.
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