imoses44

W220 - '05 S500
My issue is identical to the image above - the intake nipple melted.
Are there cost effective solutions to repairing this?

The following video suggests swapping out the top half, but I currently only see full unit replacements on ebay.

Also, does a replacement need to be programmed?

ibeforreal

From my understanding a replacement PSE Pump has to be programmed via the STAR/DAS system.

babyman1737

Big bump.

Had the same thing happen to mine, same plastic nipple that melted. Has anyone simply heated up and threaded in a brass barb?

To avoid programming with STAR/DAS are there any good places to buy the plastic housing and swap over electronics?

wallyp

My immediate reaction is - What the heck melted the nipple?

While I think that just replacing the melted nipple is feasible, it might be the equivalent of putting a bandaid on a cancer. Something in there is getting really hot. What? Why? Can that be fixed?

babyman1737

Nipple melts from the pump running non-stop. It was running non-stop because of cracks in the trunk soft-close feature, which is detailed in other threads to fix with 2-part epoxy. I've fixed that. Now I need to fix that plastic nipple.

Astro14

I've never tried fixing a PSE pump but I just installed a new pump in my W220. I haven't torn down the old pump to see where the problem was...

But if you want my old pump as a core/potential source of good parts - PM me your address and it's yours.

wallyp

Just one comment - I know of no situation where the PSE pump should run continuously...

tusabes

Right , one of the posters said it was cracks in the self close causing it to run extended time abdvthe cracks were fixed

the pump should have timed out and shut off by itself but maybe it wasn’t a severe enough leak

Astro14

I could see how one might keep resetting the fuze to "restore" that circuit...and burn up the motor in the process...