Fuel Pump - Check Valve Diagnosis
84audi1Applies To AUDI 4000
4 cyl. CIS-E
1984
Group
20
Subject
1.8 Engine
Part Identifier
Key Points
Fuel pump check valve
A 052
Number
83-03
December 9, 1983
Fuel pump check valve, checking
Note
This leak test checks all fuel supply line connections from fuel pump to V.A.G. 1318 tester.
- using adaptor V.A.G. 1318/23 connect tester V.A.G. 1318 to fuel supply line (white arrow) as shown.
CAUTION
During test the lever on tester must be in the closed position.
- connect adaptor US 4480/3 as described in Group 25 of Repair Manual
- switch tester US 4480/3 ON until pressure gauge shows reading of approx. 5 bar (71 PSI).
- switch tester OFF and wail 10 minutes.
^ If pressure does not drop below 2.6 bar (36.5 PSI) system is OK.
^ If pressure drops below 2.6 bar (36.5 PSI) check fuel supply line connections.
^ If pump connections are not leaking, replace fuel pump check valve.