ZF6 cooler pump

[rascal]

Ok, I have done some research but can't find anything.

I have a ZF6 and recently added the DieselSite transmission filter. I ordered the pressure gauge with it but I never get a reading. I have disconnected the lines with the truck running but I do not get any flow.

However, my fittings were leaking (did not have enough teflon tape) and the lines had fluid in it. The general consesus is that the pump runs when the engine is running but it seems to only run with the truck in gear. I have done everything short of putting the rear on jack stands and putting it in gear.

Is anybody here familiar with these pumps and how they operate?

Thanks,

[timmyboy76]

cant help, but only thing i came up with is that the pump is soo minimal, that you wont see a pressure reading. got me one of those filters' too, but a DIY system...

[rascal]

Interesting. I will run that by Bob@DieselSite tomorrow. I believe you are correct.

However, after taking her out for a test drive it appears pressure is building because I am getting a little fluid leak around the seal of the filter.