I just had a chance to replace Bosch pump with Johnson. I was going to put together a kit to make it easy, but in all honesty it is very straight forward swap that does not require any special adapters or tools.

Here are the pictures:

1. Stock Bosch Pump.


2. Johnson is smaller physically, but delivers 50% more flow (22.5 L/min vs 15L/min).


3. Simply bolt Johnson pump to the factory bracket.


4. Here is what it looks like on the car. Connector was just spliced.


5. Here is data before and after - same route, just about the same ambient temperatures - 90F vs 92F. Both pumps cool about the same, if anything Johnson is about 10F cooler.

thanks for the DIY!

great DIY vadim.

one more stuff to add to my list in the future.

probably going to do this to my E55...

thanks for the write up.

I think it would be best if someone can find the right connector. I did on my C32, but I had to search a "pick your part" store for it.

splicing works too, but having a connector would make it a nice clean job.

btw, how do you tell which is + and which is - when you splice the wire from the car?

Red is positive, brown is ground.

where can we order this pump from? Thanks

will the CM30 work?

http://cgi.ebay.com/ebaymotors/Magne...em200141033580

thanks for the link! i just ordered one....

yes, same question, where can we order the pump from?

Vadim, thanks for the great info, as always.

One q: is it possible to dismantle the old pump in such a manner that would allow for the connector to be reused? Thanks!

Great DIY! Thank you.

Post #168... Will this connector work?

https://mbworld.org/forums/showthrea...=146457&page=4

Thank you guys!


You will have to disassemble the pump and cut out the connector and than splice it into Johnson pump.

Cool. That's what I'll do. I just wanted to make sure it could be disassembled without destroying the connector.

any body have a link to where we can order these pumps. Thanks

Fantastic ....... thanks for the consistent great advice Vadim ......

Any chance you could show some piccies on how to wire it up so it runs all the time when the ignition or engine is on, so the computer doesn’t turn it on/off when it thinks it needs to ?

This is the US Distributor for the manufacturer:
http://www.johnson-pump.com/JPMarine...tion/cmco.html

I do not have pictures handy, but it will be very easy to do. Simply run the red wire to any of the fuses in the fuse box, that are on when key is in position 1. Pump only draws 2 amps, so most circuits can handle it, or use a relay.

other than e-bay, this is the lowest price ive seen so far

http://www.autoperformanceengineerin...ml/jabsco.html

$84 shipped, 7 left after I get mine....

http://cgi.ebay.com/ebaymotors/Magne...QQcmdZViewItem

Hmmm, I wonder if this will help on my car.

Looks like this is the end of the Lightning pump replacement. That's ridiculously cheap.

Vadim, is it CM30 or C030 or was that just a typo in the title. lol

One less now. CM30 FTW.

One more less...LOL