Can I install a new 1976 fuel pump on my ZZ4 motor installation and do I need a push rod as well? I reason I said NEW fuel pump is because I ordered one once I realized the there were two tubes comming from the pump as well as the fitting to the carb. I don't know why there are two but one is smaller and connects to a line returning to the tank. Is this to provide some pressure to the tank driven off of the pump or what?. Anyway in order to connect to the two tubes I guess I have no other option than to use the original design.....correct? Will it provide enough pressure for the ZZ4 w/750 holley?

Best to my knowledge, a standard side block fuel pump will work for you.  In my 78, the previous owner had a NO2 plate, so he had an electric Holley Blue pump under the rear bumper.. i just stayed with it, the main line went up to a regulator in the engine compartment, and the return line is blocked off, its simply a return line off the pump, guess it helps relieve some pressure when the fuel demand is not enormous(probably helps the pump last a little longer??)... as for the stock pump, it will provide enough pressure for a 750 holley.. or Q-jet... most fuel pumps are around 5 to 8 psi...  :) (dad's '76 has a standard pump with a 750 Edlebroke...seems to work just fine)...

The small line is a return line.  They were used to provide a certain amount of recirculation to prevent vapor lock.  The ZZ4 does have a cam to drive the fuel pump, so with a plate and push rod, you should be able to connect to your existing lines.  The important measure of a fuel pump is whether it pumps enough volume to feed the carburetor.  A ZZ4 is so much more efficient than your original engine it probably doesn't use much more gas.  In any case I have seen many Corvettes with ZZ4s and happy owners.

Larry

Thanks for the responces guys!

HUH?
Make sure the engine you have HAS a place for a mechanical pump. Ya never know.
When Speilman's pump took a dump in Hot Springs, we replaced the fancy-shmancy polished one that came on his engine when he bought it with a plain-jane replacement pump for a '76. Worked just fine. We did have to do a little creative plumbing, but it apparently got him home safely!
Does the engine you got have the fuel-pump plate on the pass side of it? If it does NOT, then it won't have the pushrod either. If it does have the plate, it prolly does have a rod. I'm talking about a regular pump plate...not a block-off plate. Either way, you can remove the plate and look to see if there is a p-rod in there. You WILL need the p-rod if you use a mechanical pump. There's no other way for the pump to work.

hth

My new motor came with two red plastic plugs installed in the fuel pump cavity. No Plate, just the two threaded holes for the fuel pump bolts. I will have to check with the GM Engine Depot to see if the push rod was installed or not. When I removed the red plastic plugs nothing came out or dropped that I remember.

I got a reply from the GM rep on the ZZ4 and he stated that I will have to buy a push rod or use the one from my old motor. So I ordered the mounting plate, push rod and gasket from Corvette Central to go with the fuel pump and mounting bolts I already ordered from them. I guess I should have figured all this out but now I know.

Be sure to put some assembly lube on the ends of the push-rod before inserting it...this will keep it from galling the cam, or the fuel pump lever. You can get a small tube of this at any parts house...it's used for building engines. Lubriplate is the most common brand. Adams' Apple2008-06-05 10:03:03

Good Idea I will also place some heavy grease on the rod to hold it up while I install the pump but if that dosen't work I will try that method of installing a longer bolt in the engine block to hold the rod in place while I install the pump. It would have been easier if I could of done this all with the engine out of the car but I have learned that I couldn't install the motor mount bolts to the frame with the pump in the way and would have to remove it anyway.

Mission accomplished in only two attempts! I got the fuel pump installed last weekend and found only one issue that I had to deal with besides the push rod wanting to drop down before I got the pump bolt installed.