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Originally Posted by Ben
So is this how I should run the lines?
From the fuel filter to an "IN" port and block off the other "IN" port.
And the "OUT" port goes into the fuel rail where the stock FPR is? And the vacuum line just goes to the same port on the intake manifold as the stock FPR?
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No, if you route it this way, you don't have a means for the return line. So if you route it the way you wrote, then you'd have to use the proper earls metric -> AN adapter, then another AN -> AN reducer to get it to -4, then hook up a -4 line from that to the fuel return hardpipe by the coolant neck (or all the way to the firewall, whichever you prefer).
It would be better if you made a line from the fuel filter to the rail. Then from rail to FPR, then from FPR to hardline.
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I thought the other "IN" port could be used for the gauge, but the gauge won't thread in it - I would need to buy and adapter to make it fit.
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Correct. Depending on the gauge you are using (most use a 1/8" NPT), you'd need an AN -> NPT adapter.