SOURCE: 2002 Chevy Silverado 3500 Fuel gauge reads 1/2
If this was not a problem before the pump replacement then the sender in the tank may of faied or is contaminated with sulfer which is corrosive to the silver electrical contacts.
Do a search on sulfur corrosion and fuel sender units. Gm has big problem with this. Its possable the stress from removing the old and installing the new pump created an issue with contacts. If this is the case you will now need a sender unit.
SOURCE: I need the serpentine belt diagram for a chevy Express Van
DRIVE BELT DECAL SHOULD BE UNDER THE HOOD.OR YOU CAN GO TO DEALERSHIP GET ONE AUTO ZONE OR ADVANCE AUTO PARTS CAN GET YOU ONE.OR YOU CAN BUY A HAYNES REPAIR MANUAL IT HAS BELT DIAGRAM.
SOURCE: location of and how to
These units are in the tank and must be dropped in order to replace. Fig. Fuel level sending unit on fuel sender (fuel pump) module.
WARNING
Do not handle the fuel sender assembly by the fuel pipes. The amount of leverage generated by handling the fuel pipes could damage the joints.
NOTE
The modular fuel sender support assembly will spring-up when the locking ring is moved.
To install:
SOURCE: will crank over-fuel pump is
There should be a fuse relay box under the hood with a fuel pump relay in it...have someone turn the key while you touch the relay to see if it is clicking when you turn the key..if not replace relay....if it does click, then it may be possible that the contacts on the relay are defective and the relay will need replacement anyway...there may also be a fuse for the fuel pump either in this box of under the dash...check to see that it is good also.
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