View Single Post
echrisconnor echrisconnor is offline
Registered
 
echrisconnor's Avatar
 
Join Date: Dec 2001
Location: Boulder, CO
Posts: 809
Garage
System/Control Pressure test for dummies?

I'm about to perform a system/control pressure check on my CIS car, and want to make sure I'm getting this right. I've read over the factory manual, but got more confused after reading it. Based on previous posts I've read, here's what I beleive to be true. Please correct me where I'm off.


Cold Test (requires a cold car):

1. Hook up gauge between WUR and Fuel distributor.
2. Disconnect electrical plug to WUR
3. Jumper fuel pump so it runs
4. Observe readings on pressure gauge and compare against chart for proper values.


Warm Test:
1. Leave gauge in place as it was for cold test
2. Connect electrical plug to WUR
3. Jumper fuel pum so it runs
4. Turn on ignition (so there's power to the WUR)
5. Watch pressure raise once power is applied to the WUR
6. Observe final warm value

System Test:
1. Leave gauge in place as connected above.
2. Close valve on outbound/WUR side of gauge setup.
3. Jumper fuel pum so it runs
4. Observe system pressure

Approximate values for '76 WUR:

Cold values:
50 deg 18-23psi
70 deg 25-32 psi
90 deg 34-39 psi

Warm pressure = 40-45psi

System pressure = 65 - 75psi

All above tests are done with the car off/not running. There are some other tests for under partial and full load, and with the vacuum pressure, but how critical are these other tests?

Thanks all.

Chris
__________________
'76 911 Carrera 3.0
Old 12-06-2004, 09:32 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)