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How to Install a Fuel Pump in a 1984 GMC S 15

The 1984 GMC S-15 truck with the six-cylinder, 2.8-liter engine is carbureted instead of fuel-injected. As such, the fuel pump on this truck is mounted on the side of the engine block and driven by a cam on the camshaft. If the fuel pump isnt working properly, you can experience poor performance, stalling, and even backfiring. You can change the fuel pump n the 1984 S-15 in about an hour to two hours in your front yard.

Instructions

1

Slide the jack under the front frame cross member, and lift the truck until there is enough room for you to comfortably slide under.

2

Place the jack stands under the frame behind both front wheels, and caully lower the truck onto them. Remove the jack.

3

Slide under the truck, and locate the pump on the lower left front side of the engine. Tag the fuel lines if they are both threaded fittings so you know which line goes where.

4

Remove the fuel lines from the pump. Most fuel pumps will have two threaded fittings; remove these using the flare nut wrenches and turning the fittings counterclockwise. If either of the connections has a rubber hose clamped to it, squeeze the clamp with the pliers, and slide it back on the hose a few inches. Grasp the fuel line, and twist and pull it off the pump nipple.

5

Remove the bolts securing the fuel pump to the block by turning them counterclockwise with the ratchet and socket. Remove the fuel pump by pulling it away from the engine.

6

Clean the block side mating surface of all remnants of the old gasket using the gasket scraper.

7

Apply a thin bead of RTV sealant to both the block and pump mating surfaces. Apply the gasket to block mating surface.

8

Hold the new fuel pump in place, and insert the bolts in the bolt holes, and turn them clockwise by hand. Tighten these bolts to 15 foot-pounds with the ratchet and socket.

9

Reattach the fuel lines to the pump. For threaded fittings, thread the fittings into the new pump by turning them clockwise by hand. Tighten the fittings to 15 foot-pounds using the flare nut wrench. If so equipped, slip the rubber fuel line over the nipple. Squeeze the clamp, and slide it over the nipple.

10

Slide the jack back under the front cross member, and lift the truck off the jack stands. Remove the jack stands, and lower the truck. Start the truck, and verify there are no leaks.