/6 in a '64 Clark Cortez (18.5 feet long); when under power for a while fuel pump (stock NAPA part) can't keep up. I've checked the metal line as best I can (its very long and runs through many channels in the unibody construction), and replaced all the soft bits. Clear filters indicate fuel just isn't there. I want to replace the pump with something that will solve this problem. Is there a high volume mechanical that would do it, or should I go electric? (I would rather avoid the pasta job that is this vehicle's wiring.) Any insights on getting a long haul fuel line full would be appreciated.

zac

zac_smith@hotmail.com

It is best to understand the problem before replacing parts. You may want to "gravity feed" the carb. and run the disconnected fuel line into a can just to see what is happening. I did this on my 65 Dart a while back because the filter was not getting much fuel, I saw a lot of air being pumped and that lead me to cracks in the *incomming* rubber fuel hose leading into the pump. Seems that the pump suction would pull-in a lot of air instead of bringing fuel up from the tank. A new 5 inch piece of rubber hose fixed the problem.
Another good test is to disconnect both ends of a long run of uel line and blow air through, you should get a good spray out the end with-out much "kick-back" into your air nozzel. This test can also be done for a clogged gas tank pick-up screen (sock) inside the tank.
If you do find that the stock fuel pump really the problem and can't keep-up, you can swap the arm in a high flow Big Block Mopar fuel pump and use that "hybread" in your SL6.
DD