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Background: When I got the car, it was a stock L26 with flat top carburetors. Three years ago, I changed out the carburetors for round top carburetors. For a while I noticed that after I had been running at freeway speeds, returning to stop-and-go traffic would result in hesitation during acceleration until it seemed like the car cooled down for a while. I enriched carburetors some more, and the problem seemed to go away. In February, I did an engine swap, putting in an L28 with an N47 Maxima head. Since the head wasn't configured for a mechanical fuel pump, I just ran the stock electric fuel pump. The hesitation returned, even with enriching the carburetors even more. I installed a fuel pressure gauge and found the pressure to be around 2.5 PSI. I changed out to a small Holley fuel pump (12-147), but the pressure dropped down to 2 PSI. Saturday I changed out the fuel pump for a bigger Holley fuel pump with a fuel pressure regulator (L:12-802-1). The FPR was installed downstream of the fuel rail. At first, the pressure was at 12 PSI. I opened the small orifice on the exit of the fuel rail. The pressure dropped to 6 PSI. Moving the adjustment on top of the FPR did not raise or lower the fuel pressure. I moved the FPR to in front of the fuel rail. The pressure held at 4 PSI. I thought I was good to go. Today I drove the car to help a friend with his Z. It did fine on the trip down. It did fine when I took him in a ride in the car. When I was leaving, the old problem returned. I checked the fuel pressure when I got home. It was below 2 PSI. I moved the FPR back to downstream of the fuel rail. Pressure was 2.5 PSI. Again, using the adjustment screw did not change the pressure. I am out of ideas. -
For your consideration is a Holley carb conversion package with everything you need to run. Includes 240Z SU type intake manifold, 4 barrel conversion manifold, 1 Holley 390 cfrm in good condition with fresh rebuild, 1 spare Holley 390 carb of unknown condition (may need rebuild), linkage arm, and chrome air cleaner with filter. The 4 barrel conversion manifold is an odd beast for sure. Looks like it was made for a blow through turbo. It really drops the carb down low and has connections on the bottom for some kind of cooling (or heating?) system. Really interesting piece. I took this off a ITS race car we are currently restoring. Going back to SU's. I tried to take lots of pictures. Asking $500 for entire setup and free shipping in continental US.