andywalter007

I purchased a new fuel pump from a different manufacturer. It has a much firmer and shorter arm throw for a complete pump cycle. I manually measured the difference between the two, and the new pump has a 1/2-inch shorter throw. It's behaving more like I expected. It quickly returns to the start position without much delay, and I get approx. 5 lbs of pressure from it. I'll agree with Zpenman at this point and chalk it up to poor manufacturing of the original replacement part. Thanks, everyone.

New fuel pump was assembled incorrectly. I had to rotate the top 180 degrees to get the flow the correct direction.

1971 240z: I removed the valve cover and manually operated the fuel pump arm. When I release the arm, it sends fuel to the carburetors. I noticed that it takes a noticeable amount of time for the arm to return to its starting position on the cam lobe. During this return, the pressure has a max of 6 psi. I can confirm that the return line produces a visible spray of fuel into a glass jar. Once the spray from the return line diminishes and I see the pressure drop below 3 psi, the pump arm is ready for another cycle. With the engine NOT running, should I assume this is normal behavior? My concern is the time delay. If this delay remains during engine operation, the fuel pump arm would float and never have a full stroke. That's assuming it is supposed to always have a full stroke 100% of the time.

Your picture helps 100%. I am missing the piece that bolts into the diff cross member. If I can't find one to purchase, I could fabricate a decent one using an angle iron.

Are there solutions for replacing the metal exhaust mounting bracket attached to the diff cross member (C in the diagram)? I'd love to find an original part, but that has been challenging.

Update on the progress. In Mig Welder stage. Tackling the rust. All the normal areas. Battery Tray , Cowl/Air Intake and related firewall. Floor Pans of course, Spare Tire Tub. Both wheel wells and back hatch shelf. Originally from Texas with some hail damage on the roof you couldn't see until in person. It's come a long way in the recent Pandemic months... multiple weekends of car time and not at kid sport events.