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Pump starts when Key On. Return hose (at pump) completely dry. I think this points to needing to prime. I can try the turkey baster idea of filling the pressure hose, if you guys think that'll work to get it primed.

No, didn't do that. Quick How To on that?

Quick update: No leaks but no power either - it was as if I didn't have any power steering. I can hear it humming and feel a slight vibration in the unit when touched. Let me do some tests - make sure the signal wire is sending a signal to the unit to turn on. Things like that. I'll let you know.

Yep, that's what I must do. Okeydokey, out to the Jeep shed, what's the worst thing that could happen.....

Didn't even think about the viscosity - interesting, makes sence, you know, at least as a talking point. I just bought a gallon of the general purpose stuff. If I put it in, I assume it will work but what do you think I should look / listen for - squealing from the pump, if it's working too...

The Saginaw in my Jeep and about 5 million other Jeeps, were made before there were synthetic fluids (1980's era) - the reason I'm here is because I was hoping someone would have far more experience then I on this mixed set of 60++ year-old Saginaw connected to a 2004-2014 Volvo pump. What do...

I guess the question becomes this: the Saginaw is cool with ATF, is the Volvo also?

Because the seals for one of the parts was made for use with a certain type of fluid and the other was made with a different one in mind. ATF and CHF are very different. CHF is what's called for according to many of the links to Volvo sites - I don't have one so I just don't know. For example...

I think that's the problem, it might have stronger additives that might (probably will) eat the seals in the steering knuckle (Saginaw). Don't know....

God, I sounded like a complete **** - sorry, I've been dealing with people that think changing vintage vehicles to EVs - especially Jeeps - is on the level of capital murder - pure sacrilege. Again - VERY SORRY for the tone!!! No, I don't know what to do, someone suggested that the steering...

Okey, well, A.) I'm not on the trail and B.) I'm not comfortable making a Sophie's choice, or for that matter, think I should make that pick. Silliness aside, yes, ordinarily in an ICE rig, if I was a mile or more from the trail head and something broke, I'd pull out my ATF that I always carry...

I'm at the fluid filling point of my build and now down to hooking up the Volvo S40 electric power steering pump to my stock Saginaw steering knuckle. A large contingent of Jeep owners call for ATF power steering in the stock set up. Volvo calls for CHF 202 - I can get that as Pentosin CHF 202...