CHECKING FUEL PUMP DELIVERY PRESSURE
A) BMW 630 i:
Connect pressure meter 13 3 061 or 10 bar (142 psi)
pressure tester from BMW service test unit
between cold starting valve and ring line.
Delivery pressure¹) should be 2.5 ± 0.2 bar
(35 ± 3 psi) at engine idle speed.


¹) See "Replacing Pressure Regulator"

B) BMW 633 i:
Install pressure meter 13 3 061 or 10 bar (142 psi)
pressure tester from BMW service test unit
between cold starting valve and fuel line.
Detach vacuum hose (1) from pressure regulator.
Start engine.
Fuel pressure 2.5 ± 0.2 bar (35 ± 3 psi).
When attaching vacuum hose (1), pressure must
drop to approx. 2 bar (28 psi).
Pressure should rise briefly when operating
throttle.

Vehicles after change point in 1982
CHECKING FUEL DELIVERY PRESSURE
Install pressure tester 13 3 060 with connecting
line and t-adapter 13 3 064 in fuel feed line in
front of the fuel pressure regulator.
Plug fuel return line with Special Tool
13 3 010.

Pull off fuel pump relay (1).
Bridge terminals 87 and 30 with Special Tool
61 3 050.
Check delivery pressure*.


* See Specifications of Gr. 16