I'm back....as stated before, i decided to stick with the return line setup. I ordered a new fuel pump, listed for a 1968 400 4bbl. The pump I received is a new AC Delco Part No. 40607, and looks fine, except for one thing. The nipple to attach the return line to is closed off on the end, except for a pinhole at the center. The old pump I am comparing to has the nipple opened up to about 3/16", similar to the incoming fuel nipple, but smaller diameter. Old pump is an AC #52 40607. The old pump came on the motor I am rebuilding, which is a 68 400 2bbl from a Catalina with AC.
Can I use the new pump I received and still get the benefits of the return line, or do I need a pump with the fully opened return nipple?
Is this return nipple for a 'fuel vapor return line', and if so is there a difference between that and a 'fuel return line'?
Thanks in advance for any help you can give me.
|