Power Steering Pump help needed!

This pump has no leaks I put Lucas power steering fluid in and got a new cap also seems to be 100%

I put the driveline in a friend/customers 66 Charger. 383/edelbrock EFI/833 4SPD./Paxton Novi 1500/Doug's Headers/TTI Exh./Chrome Saginaw pump. I burnt up 2 pumps before I remembered the Saginaw has to have the larger fitting into the steering gearbox. And you have to use the proper size pressure hose to the box. The car originally had a Mopar/TRW pump which uses the 3/16" hose and fitting whereas the saginaw uses 1/4". The smaller hose and fitting used with the saginaw pump creates higher pressure and heat which burns the pump. I put the correct parts on and all is fine.

I used a slightly different oval track set up, I think mine is a Sweet Mfg pump (exact company slips my mind right now) with divorced tank. I may add a cooler in the near future.

Old pick from my '67 after we pulled the engine.

I hope you are not using Lucas stop leak in your pump, as this will foam up badly causing possible problems you are experiencing.
Does the firm feel box use smaller piston or reduce pressure? If it's reduction in psi, at higher rpms you could be bypassing in the pump always heating the fluid badly and creating high internal pressures.
Possible solutions would be larger pump pulley our smaller crank pulley. If your new pump starts to have issues that is.

I have the same problem, brand new chrome pump from Tuff Stuff, brand new steering box from Borgeson, New Hoses with proper diameter, Pump is leaking but not from the hoses, suspect overheating although I have the March pulley kit that I think is under drive (1.2 ratio).

I have done some research and I am suspecting my new pump with key way pulley shaft has more flow and generate too much heat but I don't have proof since nobody publish the flow of their pumps. The can/reservoir is also probably too small. I might consider a remote reservoir & a cooler but If I could just find a pump with a key way pulley shaft but with less flow I would be very happy.

I have also noticed that the OEM hoses had a weird loop in metal tubing going up and down right after the pump and I am now wondering if this was not some kind of OEM cooler... My custom hoses don't have that metal loop.

I always thought that loop was some sort of anti drain back. I guess it would cool also.

Just for reference, the original rebuilt pump from my core engine ('78 Cordoba 400) with stock repop hoses (NAPA) has been leak and problem free. I turn it with a smaller than stock crank pulley from March to keep speed reasonable with my hotter engine (6 1/4" vs 7 1/4"). I may add a PS cooler but it has been completely happy so far running Dexron ATF fluid so no rush.

I assume your pump is press on pulley shaft?

I have the March Pulley kit with Key way and I think all key way shaft might be higher flow than my stock pump...

Found this very interesting discussion stating that most (if not all) after market pumps have the thicker Cam/Vane pack with 30% increased flow...

http://www.pirate4x4.com/forum/general-4x4-discussion/973826-what-s-going-inside-ps-pump.html

Yes, the one I run is the later OE style press on Saginaw.

The original pump on the car ('70 318) is the keyed shaft Saginaw with big nut. I've got that one stashed away. It can be used on a BB with a conversion spacer from Bouchillon.