Skylark V6-173 2.8L VIN Z 2-bbl HP (1982)
Fuel Return Line: Customer Interest
Engine - Fuel Line Knock When Cold
Model Year 1983
Bulletin No. 83-154A
File in Group 64
Number
12A
Date
July '83
SUBJECT:
FUEL LINE KNOCK
MODELS AFFECTED: 1982-83 SKYLARKS WITH 2.8L V6 ENGINE
NOTICE:
This is additional information to Bulletin 82-T-95A, File Group 64, 32A, dated March of 1983. Please discard original bulletin 83-154 to
correct the model - it should be Skylarks.
Some 1982 and 1983 Skylarks with 2.8L V6 engines may exhibit fuel line knock when cold. The noise is usually heard inside the car, and is more
pronounced when the vehicle is cold but may still be present after vehicle reaches operating temperature. In most cases, the noise can be temporarily
eliminated by pinching off the fuel pump return flex hose.
To alleviate this condition, install thermal disc, P/N 14077716, in the fuel return line. The thermal disc shuts the return line in ambients below 60~
(15.5~C) and when open has a restrictor orifice of 1.5 mm. The valve is marked for directional flow, tank towards tank and pump towards fuel pump.
Installation Procedure
1.
Locate fuel return hose in engine compartment, cut the flex hose two inches from the end attached at the transmission. Remove approximately 1/2"
of hose from the hose attached to the chassis pipe. Note if the section of hose has a restrictor installed, the hose and restrictor should be discarded
and replaced with a new piece of hose (GM 6198M) 8-1/2" long (refer to Illustration 1).
2.
Remove and discard the hose on the thermal valve (P/N 14077716) and install according to flow direction as previously mentioned.
3.
Install hose clamps, P/N 1619412, and torque to specification (25 in.lbs.). Refer to view A of Illustration. Two clamps required at thermal valve
and one clamp required at chassis pipe if hose was replaced.
4.
Check for clearance between the thermal valve and the fuel feed hose. If clearance is not approximately 1/2", carefully bend the return pipe
upward to achieve this clearance.
Labor Operation Number:
J6300
Labor Time:
.3 Hours
Trouble Code:
92
