I just installed a new Johnson pump, it's a lot small than the one that came off. It fit on the hoses fine and the wires are hooked up to the correct polarity. My question is when I turned the ignition on the pump does not turn. I checked before I put the hosed on. I them put hoses on and started the car and felt the pump, it does not appear to be turning. Does it not run all the time, does it only run when the supercharger is engaged. I don't want to lower the car and button it up if there is a problem. I did check the fuse first.
Thanks for the help.

 

Pretty sure it does not run all the time (there is a mod to make it run all the time though). Someone with more knowledge of the matter will chime in. Could always use a multi-meter to check the current. I likely would just put it back together and take it for a drive. If when you step on it the car feels sluggish, it's likely not working.

 

It only runs when the SC kicks in. Take it for a ride and if you get on it and the SC does not kick in you might have a wiring problem/ bad pump/ blown fuse/ bad connection


I think it will work fine.


Why'd you change it?

 

I took it out and it is fine. I replaced it because the supercharger would disengage because the pump was bad. I hooked up the old pump to the battery charger to test it and it would do nothing.

 

Thanks for the replys

 

I had the same question when I installed my new Johnson pump . . . My experience was even more frustrating because the first brand new Johnson pump I installed turned out to be DOA. I had to get a second one.


Actually, the IC pump first turns on when the engine RPM first reaches +2000 rpm (or thereabouts). Then it will stay
on until you shut down the engine.


All the information you seek can be found in this thread grasshopper . . .


https://www.crossfireforum.org/forum...oler+pump+turn