Paul,
In the 1972 cars, there is a line the comes up from fuel tank to the
separator in the fender, then the line runs down and forward to the
charcoal cannister. There is no cross-the-trunk plumbing.
Those pipes seem to be properly stopped up. You should be able to
blow through them with gentle lungpower, whatever fraction of a psi that
would represent.
Perhaps continuing the brute force pressure method will clear them. I
don't know--haven't faced that severe a problem with mine. Perhaps a
squirt of some solvent down the pipe would help? Has anyone tried that?
Bob
On Fri, 02 Aug 2002 08:31:43 -0500 Paul Root <proot@iaces.com> writes:
> Hi all,
> A week or so ago, I mentioned that I had a pressure
> problem in my fuel tank and that the gasket blew out on my
> fuel pump. I put the old (wrong) gas cap on which basically
> vents.
>
> Ok, I finally got time to look at this a bit last night
> and it seems that the vapor pipes are clogged.
>
> First, the rear vapor pipe (in the trunk) lets a little air
> go through. I
> disconnected the fitting near the fuel pump in the trunk and put an
> electric air pump (little Craftsman thing for tires, etc.) on the
> line
> and I can feel just a little air coming through the pipe. The pumps
> gauge says something along the lines of 90psi. Strange thing, the
> pipe
> goes from the vapor canister forward along the fender, then all the
> way
> across the trunk in front of the lid by the hinges and then back and
>
> down to the fitting. Does it really need to be that long? BTW,
> nothing
> comes out of the pipe except a little air.
>
> Then I went to the front and put the air pump on the front
> pipe. I'm
> alone so I don't have anybody feeling if there is any amount of air
> at
> the fitting in the trunk. But PSI is getting to 110 or so and you
> hear
> the pump straining. So I'm guessing that's pretty well clogged.
>
> Am I right in thinking that the front pipe goes from the
> absorption
> canister all the way to the fitting in the trunk? There's nothing
> hidden
> under there is there? I tried following it under the car, and that
> appears to be the case.
>
> So, can I go over to a friends house and put a real air
> compressor on
> these pipes and see if I can't blow those things out
> properly? Or is it just time for new pipe?
>
> Thanks,
> Paul.
> '77B
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