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Home » Public Forums » GMCnet » Anybody installed a Delco 20804130 Vacuum Pump?? (Mine leaks back badly)
Anybody installed a Delco 20804130 Vacuum Pump?? [message #314526] Sun, 12 March 2017 18:05 Go to previous message
Matt Colie is currently offline  Matt Colie   United States
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma:
Senior Member
OK Dave Lenzi sold me.
An Electric vacuum pump was on this winter's list.

I bought an ACDelco 20804130 Vacuum Pump (Bosch/Hella part) on Ebay. I finally got it plumbed in. (If you do not have significant metal working facilities available, consider buying Dave's manifold.)

The pump ran as soon as it was powered. It did not run and shut off. It did a lot of run-stop-run. I identified that the pump was leaking back very badly. So, I added another check valve. Unfortunately, the check valve available at the parts stores are all the CCV (Cheap Chinese Version) and they leak only somewhat less than the pump itself. I haven't tried it with the engine running because I still have to finish the cooling system flush. That will be later this week when I also load water and LP for the excursion to Shawnee.

Matt


Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
 
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