1990 Chevy Truck Fuel Pump Installation
The 1990 Chevrolet truck uses a submersible pump to send gasoline from the fuel tank to the engine. The pump consists of a small electrical motor that can burn out and fail to function correctly. Replacing the fuel pump is required when the pump is no longer able to function correctly. Replacement of the fuel pump will require unbolting the fuel tank and pulling the pump out of the top.
Other People Are Reading
Instructions
-
-
1
Park the truck on a flat and level surface. Ensure the parking brake is set.
-
2
Crawl under the truck to locate the fuel tank. The tank is at the back of the truck under the bed. Place a jack under the tank. Ensure the jack is raised so the top of the jack is placed at the bottom of the tank. The jack will make removal of the tank easier.
-
-
3
Undo the two straps holding the fuel tank with a socket wrench. There will be four bolts to unscrew. The tank will settle on to the top of the jack. Do not lower the tank to the ground until all the wires and hoses are disconnected.
-
4
Unplug the electrical connector at the top of the fuel tank. Raise the locking tab and pull the connectors apart. Pull the vacuum hoses and fuel lines from the top of the fuel tank. The fuel lines will have a quick-disconnect fitting. Squeeze the fittings firmly and pull away from the fuel line.
-
5
Locate and unscrew the hose clamp on the fuel filler pipe at the back of the fuel tank with a flat tip screwdriver. Pull the hose off the tank by hand.
-
6
Lower the jack to the ground. Pull the fuel tank off of the jack and out from under the truck.
-
7
Punch the retaining ring at the top of the tank counterclockwise with a flat tip screwdriver and a hammer. The screwdriver can act as a punch. Strike the end of the screwdriver while the other end is pressed against the ring in a counterclockwise motion with the hammer. Set the ring to the side when it is off the fuel tank.
-
8
Replace the old o-ring with a new o-ring. The o-ring will be along the top of the threads. This will prevent leaking when the fuel tank is filled up.
-
9
Pull the pump out of the fuel tank. Ensure it is pulled out at an angle as the sending unit will prevent it from coming out straight.
-
10
Disconnect the fuel pump from the assembly. The fuel pump is shaped like a tube. Disconnect the electrical wire at the top of the pump.
-
11
Replace with the new pump. The pump will clip into place. Attach the strainer into the bottom of the pump by bolting it into place. Connect the wiring harness to the top of the pump.
-
12
Place the fuel pump assembly into the fuel tank. Insert at an angle so the sending unit does not get bent in the process.
-
13
Screw the retaining ring by hand. Secure the ring in place by pushing it tight with the screwdriver and hammer.
-
14
Place the fuel tank onto the jack. Slide under the truck. Raise the fuel tank high enough to connect all the wiring and hoses. All the wiring and hoses will lock in place once they are connected to their respective connections.
-
15
Push the fuel filler hose onto the back of the tank. Position the hose clamp over the hose and the piping. Tighten the hose clamp with a flat tip screwdriver.
-
16
Raise the tank to its mounting position. Tighten the four bolts to the straps by hand to ensure all the bolts are started correctly. Tighten all the bolts with a socket wrench.
-
17
Pour gasoline in the fuel tank if the tank has no gas in it. The truck is ready to start.
-
18
Insert the ignition key in to the ignition. Turn the key to the "Start" position. The fuel pump will cycle for three seconds and turn off. This will prime the fuel system.
-
19
Start the truck and let it idle for five minutes. Watch the fuel tank to ensure it does not leak. Turn the truck off when done.
-
1
Tips & Warnings
The fuel pump can be purchased as a kit or as the whole assembly. Inquire at the automotive parts store when purchasing for more information.
It is best to perform this task with an empty gas tank to make the process easier. If the tank is full and needs to be drained, a siphon kit can be purchased at the automotive parts store to drain the fuel out of the tank.
Use caution when working around gasoline. The fuel is very toxic and flammable.
References
- Photo Credit pumping gas image by Mat Hayward from Fotolia.com
