I'm mentally challenged when it comes to using the site's search feature. I know that there's a difference between the '66 AC and non-AC fuel systems. The AC system has a return line to the tank. Does the return line come from the fuel pump, or is it from the fuel filter? I don't want to act any stupider then I am when I order the parts to install the return line. Vapor lock is a bit of an issue.
I think the AC model would return the fuel to help prevent vapor lock under a hot hood. The float design is enough of a seat that it would stave off the fuel pump pressure by itself at 5 or so PSI. The '72 has a return off the pump. The steel line goes to the carb with the big rubber being the feed and the smaller being the return... ws
Check to see if the filter has a restriction in it. If it's fully open you will need to install some kind of restriction in line or else if you leave the 1/4" line open to the tank all the fuel pump will do is return most of the fuel to the tank & not the carb, where it's needed.
Thanks for your replies guys. I'll see about picking up the correct filter tomorrow. This truck was a Diesel before the Nailhead installation, so it does have a return line for the old fuel injection. Thanks for the tip about the restriction, Tom.
If I had been in a hurry for the filter, it would have taken a week to get it. It turns out that the local parts store had it in stock. I started kidding them about having a filter for a nearly 50 year-old car in stock, and they said that the exact same filter was used by Mopar much more recently. Who woulda guessed that GM and Chrysler would use the same filter?
I remember working in Dad's '36 Buick, that it shared brake parts with 52 Ford trucks And Packard straight eights used the same carburetor mounted starter switch as the Buick straight eights.(accelerator actuated starter) And, some BMWs use the same windshield as the Ford Taurus
