GM Service Manual Online
For 1990-2009 cars only

Fuel Sender Diagnosis EFI/MFI

The fuel sender should be checked for return restrictions. For diagnosis of the pickup tube, refer to Fuel Supply System Check.

Fuel Strainer

The strainer is self cleaning and normally requires no maintenance. Any fuel stoppage at this point indicates that the fuel tank contains an abnormal amount of sediment or water and should be thoroughly cleaned.