Fuel Pump Installation

WARNING: This page is about a different variant/trim than selected.

Fig 1: Fuel Pump

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
1	Valve Lifter Follower NOTE: The camshaft must be in the base circle position before the high pressure fuel pump is installed. Procedure Lubricate the valve lifter follower with engine oil, refer to Adhesives, Fluids, Lubricants, and Sealers . NOTE: At the base circle position, the EN-51365 alignment gauge will sit flush with the cylinder head. Install the valve lifter follower. Ensure that the guide pin on the follower is aligned with the groove in the fuel pump bore. Install EN-51365 alignment gauge and rotate the camshaft until the special tool is flush with the cylinder head. This indicates the camshaft lobe is at base circle position. Remove EN-51365 alignment gauge and the valve lifter follower. Lubricate the valve lifter follower again with engine oil. Install the valve lifter follower. Ensure that the guide pin on the follower is aligned with the groove in the fuel pump bore. Special Tools EN-51365 Fuel Pump Installation Gauge For equivalent regional tools, refer to Special Tools .
2	Fuel Pump NOTE: If the fuel pump is not new, replace the fuel pump O-ring seal. Lubricate the O-ring with one drop of clean engine oil.
3	Fuel Pump Bolt (Qty: 2) CAUTION: Refer to Fastener Caution . CAUTION: Refer to Torque-to-Yield Fastener Caution . CAUTION: Alternately hand-tighten the fuel pump bolts one turn at a time until the pump is fully seated. Trying to draw down the pump without even side-to-side tightening may result in pump plunger damage. Procedure Install NEW fuel injection pump bolts alternating in steps of one turn each until seated to specified torque. Tighten 25 N.m (18 lb ft)
4	Fuel Pump Insulator WARNING: The noise cancelling foam component MUST be replaced if it has been exposed to engine fluids. Failure to replace the noise cancelling foam component that has been exposed to engine fluids may result in an engine fire resulting in catastrophic engine damage, and possible injury or death.
5	Fuel Feed Intermediate Pipe NOTE: Use a NEW pipe. Procedure NOTE: Do not remove shipping caps from the fuel rail fitting or fuel pump fitting until installation of pipe. Do not remove the fuel pump inlet shipping cap at any time. Remove any fuel pipe shipping caps, if applicable. Finger start the fuel pipe nuts to pump and fuel rail. Finger start the fuel feed intermediate pipe assembly bolt through the pipe bracket. Snug the fuel pipe nut at the pump by hand, 5 full turns minimum. Snug the fuel pipe nut at the fuel rail by hand, 5 full turns minimum. NOTE: Tightening the bracket bolt prior to final torque for the pipe nuts helps to align the fuel feed pipe. Tighten the fuel feed intermediate pipe assembly bracket bolt to 10 N.m (22 lb ft). Torque the pipe nut to fuel rail to specification. Torque the pipe nut to pump to specification. Tighten 30 N.m (22 lb ft)
6	Fuel Feed Intermediate Pipe Bolt (Qty: 1) Tighten 10 N.m (89 lb in)