The last piece of the fuel system is
the isolator for the fuel gauge which is made by
Autometer. An isolator mounts in the engine
compartment with fuel traveling to it but not through it. The gauge has
a braided steel line connected to it filled with a non-flammable fluid.
The whole process starts at the fuel pump, then travels up through the
fuel pressure regulator to the isolator. The isolator has a diaphragm
inside it and when it receives pressure from the fuel side, it then
pushes against this diaphragm which then sends the non-flammable fluid
to the gauge. All this is necessary so you don't have fuel inside the
car. It's a slick set-up so you can tell just how much fuel pressure you have
because if you run your engine lean while your in high gear, your probably
going to burn it down. I've got to much invested to have that happen so
this is just a little insurance.
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One of the requirements about this
set-up is to have the isolator mounted level with the gauge. Autometer
says that if there is a difference in the height between these two when
they get mounted, can mean a difference in pressure. To get the two
level, I used a clear plastic hose with water in it. By filling the hose
within 2" to 3" from the top, all I would have to do is watch
the water level and mark a spot on the dash where a hole would have to
be drilled.
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The red line between the MSD box and
ground wires is where the spot came out. Because this is so close to the
ground wires, they will have to be moved.
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I drilled a small hole first to see
where it came out on the engine side first. After seeing no problem with
the location, I opened the hole up to its final size. The tape was used to layout the two
mounting holes that hold the isolator bracket to the firewall.
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