Engine/Propulsion System from Chevrolet Service Bulletin

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Short Description

Subject: Vehicle is difficult to fill with fuel or filling station pump shuts off before tank is full or fuel spits back/out when filling tank (replace fuel tank filler upper pipe and lower hose)

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Content
This bulletin provides information on two different conditions.
Condition 1
Some customers may comment that their vehicle is difficult to fill with fuel or when filling, the pump continuously shuts off before the tank is full.

Cause
This condition may be caused by the variability (fuel flow rates, type of fuel fill nozzle, fuel properties) at the filling stations. There is a potential to develop an increase in back pressures internal to the fuel fill neck. This back pressure trips the fuel nozzle prior to filling the tank, or result in a hard to fill condition.

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