K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Service Procedure
TO BE PERFORMED BY CHEVROLET OR GMC TRUCK DEALERS ONLY
Dealers should first inspect each C/K or R/V vehicles fuel tank(s) and fuel tank straps for evidence of recent replacement and/or excessive corrosion as
well as evidence of existing leaks prior to performing any repair or replacement.
If it does not appear that the fuel tank(s) or straps have been recently replaced and there is evidence of excessive corrosion to the fuel tank(s) and straps,
and if the owner does not have proof that a replacement fuel tank was purchased/replaced between December 1, 1993 and September 12, 1994, the
owner should be advised that their vehicle may not be involved in this campaign. The owner should also be advised that any repairs made to the fuel
tanks, other than repairs to correct fuel tanks with defective sender unit retaining ring projection welds, would be at their own expense.
Once this inspection has been completed, the dealer should then perform a pressure test on the suspect tank to determine if their are any leaks. If the tank
does not pass the pressure test, the fuel tank should be removed and the sender unit retaining ring inspection visually for evidence of any "Lifting up" or
unevenness from the tank surface. "Lifting up" or unevenness of the sender unit retaining ring is an indication of fractured welds. Further verification of
fractured welds can be made by trying to pass a "feeler gauge" through the welds. Tanks with fractured sender unit retaining ring welds should be
replaced at no charge to the customer.
1.
With ignition key in run position, check fuel gage to insure there is no more than 3/4 of a tank of fuel in vehicle. For auxiliary fuel tanks the fuel
tank transfer switch in the cab will need to be switched to "right side" position.
NOTICE:
In cases where fuel gauge indicates above 3/4 of a tank of fuel, remove enough fuel from tank so that a 3/4 gauge reading is indicated. Drain fuel tank
as described in Section 6C of service manual.
2.
Disconnect negative battery cable after noting all electronic device settings.
3.
Disconnect radiator test cap from Radiator Pressure Test Pump (Kent Moore Tool J-24460-01 or equivalent) at hose to cap fitting.
4.
Pressurize fuel tank(s) in question following the applicable procedure shown below:
Trucks With One Fuel Tank:
