Edelbrock 17933 user manual

255 Liter/Hr, In Tank Fuel Pump

For 1985-1992 GM Cars and Trucks

Catalog # 17933

INSTALLATION INSTRUCTIONS

• PLEASE study these instructions carefully before installing your new In-Tank Fuel Pump for 1985-1992 GM Cars and
Trucks. If you have any questions or problems, do not hesitate to contact our Technical Hotline at: 1-800-416-8628,
from 7am-5pm PST, Mon-Fri, or via e-mail at: [e-mail]. Please fill out and mail your warranty card.

• Note: Proper installation is the responsibility of the customer. Improper or incomplete installation could result in poor

performance, related component damage, potential severe engine damage, vehicle fire, and will void your warranty. If you
do not feel comfortable installing these parts, we recommend having the installation performed by a professional mechanic.

• Description: This in-tank fuel pump replaces the factory pump and has an increased flow of 255 liters/hour (67 gph).
This in-tank upgrade pump is ideal for supporting performance improvements such as a big-bore throttle body, high
performance intake manifold, camshaft, supercharger, direct port nitrous system, etc. They replace your original pump
exactly and include all necessary hardware for an easy installation:

Kit Contents:

Qty. Description

❑ 1 Fuel Pump
❑ 1 Fuel Pump Filter
❑ 1 Fuel Pump Adapter Grommet
❑ 1 Fuel Tank to Pump Bracket O-Ring
❑ 1 Electrical Connector

`Minimum Tools Required:

1. Lift or appropriate jack

2. OSHA-approved jackstands

3. OSHA-approved fuel transfer pump

4. OSHA-approved fuel storage containers

5. Wire stripping and crimping tool

6. Various hand tools

❑ 1 6” Section of Fuel Hose**
❑ 2 Hose Clamps**

**Not used in some vehicle applications.

INSTALLATION NOTES

• Remember: When working on your vehicle, especially when oil or fuel is present, always work in a well ­ventilated area. Keep all sparks, open flames, or other sources of ignition away from the work area. Failure
to do so could result in a fire or explosion causing vehicle or property damage, personal injury, and/or death.

• Before Beginning: This installation can be accomplished using common tools and procedures. However, you should have
a basic knowledge of automotive repair and modification and be familiar with and comfortable with working on your vehicle.
If you do not feel comfortable working on your vehicle, it is recommended to have the installation completed by a
professional mechanic. Using a factory service manual for your vehicle for reference is helpful.

• Note: Steps shown in these instructions are intended as a general guideline only. If you are not an experienced mechanic,
you should have a copy of your service manual on hand. The installation procedure for replacing your factory fuel pump is
covered in full detail in your factory service manual.

©2003 Edelbrock Corporation
Rev. 11/03

Catalog #17933

Brochure #63-0223Page 1 of 4

INSTALLATION PROCEDURE

(Note: This rotary fuel injection pump will not work
on carbureted fuel systems. It is for electronic fuel
injection only.)
(Note: The word “bracket” used throughout these
instructions refers to the fuel pump mounting
bracket and fuel level sender assembly.)

PREPARATION

1. Make sure the engine is cool and the vehicle is on level

ground. Set the parking brake.

2. Remove the fuel pump fuse from the fuse block.

3. Start the engine and let it run until it consumes any

fuel in the fuel lines, and runs out of fuel.

4. After the engine stops, crank it again for at least three

seconds to assure the relief of any remaining
pressure.

5. Remove the negative (ground) cable from the battery

and position it so that it cannot make a connection to
the battery during the fuel pump installation
procedure.

6. Drain the fuel tank. Use an OSHA-approved gasoline

transfer pump, and remove as much fuel as possible
through the fuel tank filler neck. Store the fuel in
approved safety containers only.

7. Lift and safely support the vehicle with approved

safety stands with enough height to gain clearance to
remove the fuel tank. If lifting only the rear of the
vehicle, remember to block the front wheels.

8. Once the vehicle is lifted and supported, an alternate

method of fuel removal may be implemented.
Determine which line is the fuel return line going back
to the fuel tank (See Fig. 1). Three lines are attached
to the bracket. The first is the feed line which leads to
the fuel injectors, and has the fuel filter in it. The
second is the return line from the injectors. The last is
the vapor line which leads to the vapor canister. Trace
the return line back from the injectors and remove it
from the bracket. Securely attach a hose to the
exposed fuel return tube which leads into the tank, and
draw the remaining fuel out and into an approved
gasoline storage container.

(Note: Regardless of the method used to remove
fuel from the tank, it is important to remove as much
fuel as possible before removing the tank. This is
required to help prevent fuel spillage, and injury
from excessive weight while removing the tank).

Fuel Pressure Regulator

Fuel Tank

Injector(s)

Fuel Filter

Vapor Canister

Fuel Return Line

Fig. 1

FUEL TANK REMOVAL

(Caution: The fuel tank can be quite awkward to
remove due to its size and weight. Obtain help during
its removal).
(Note: The following instructions may not be specific
to your particular vehicle. See your factory service
manual for specific instructions).

1. Disconnect the electrical connector at the fuel tank to
main harness connector. Support and partially lower the
tank, if needed.

2. Disconnect any hoses attached between the fuel tank and
the vehicle. Be careful to avoid fuel spillage when
disconnecting the fuel lines. Mark the hoses to make
sure they are properly reconnected when the tank is
reinstalled.

3. Remove the fuel filler neck, if necessary.

4. Support the fuel tank and remove the retaining straps to
allow the tank to be removed from the vehicle. Remove
the fuel tank being careful not to spill any remaining fuel.

5. Note the condition and position of all fuel tank mounting
pads and insulators used to isolate the fuel tank from the
vehicle body. Mislocated, deteriorated, or incorrect pads
and/or insulators can cause objectionable transmission of
fuel pump noise into the vehicle.

BRACKET REMOVAL

1. Thoroughly clean all dirt and debris from the top of the
tank. Clean out any dirt from around the locking ring and
retainer. This must be done to prevent dirt of foreign
material from falling into the fuel tank while removing the
bracket.

2. Lubricate the locking ring with penetrating oil to assist in
its removal. Remove the locking ring by rotating in a
counterclockwise direction. This can best be

©2003 Edelbrock Corporation
Rev. 11/03

Catalog #17933

Brochure #63-0223Page 2 of 4

accomplished safely by using the proper service tool as
specified in the factory service manual. Using the
proper tool is ideal. However, the locking ring can be
removed by other methods. Whichever method you
use, do not use any method that could potentially cause
sparks resulting in fire or explosion.

3. Once the locking ring is removed, carefully remove the
bracket from the fuel tank. Be careful not to bend the
float arm or scratch the float when it is removed.
Discard the old fuel tank to bracket o-ring seal.

PUMP REMOVAL AND REPLACEMENT

1. Note the position of the fuel pickup filter in relation to
the bracket before removing the filter. Remove the filter
by pulling on it while rotating it in one direction.
Discard the filter.

2. Note the polarity of the electrical connections at the
pump and remove the electrical connections. Write
down which wires are connected to the positive and
negative terminals and the respective color of each
wire’s insulation.

3. (Note: Your original pump will be mounted in one of

two ways. See Fig. 2 and 3. If it is mounted as shown
in Fig. 2, then follow step 3a for removal. If it is
mounted as shown in Fig. 3, follow step 3b for removal).

Return Tube

Hose

Fuel Level
Sender

Float

Filter

Fuel Tube

Clamps

Fuel Pump

Bottom
Of Tank

Fig. 2 Fig. 3

3a. Remove the hose clamps, if so equipped, cut the

rubber hose, and remove the pump from the
bracket. Remove the cut hose piece from the
bracket tube and discard it, along with the used
hose clamps.

3b. Remove the pump by inverting the bracket. Pull

down on the fuel pump until the inlet end clears the
pump support and swing it to the side. Remove the
pump and pulsator from the bracket fuel outlet tube.
Save the pulsator and the pulsator to fuel pump
rubber spacer for use in mounting the new fuel
pump.

Return Tube

Fuel Level
Sender

Float

Filter

Fuel Tube

Pulsator

Spacer

Fuel Pump

Bottom
Of Tank

4. Inspect the bracket to ensure that the pump support has
not been bent during pump removal. The flat surface of
the support should be perpendicular (square) to the tube
it is welded to (See Fig. 4). If it is out of square, carefully
bend it back to square to allow the pump to fit properly.
Take care not to damage the support or the tube.

Return
Tube

Fuel Pump
Support

90°

Fig. 4

5. Install the supplied pump rubber adapter grommet onto
the inlet side of the pump. Test fit the pump on the
bracket and rotate the adapter grommet on the pump as
required to obtain the best pump outlet fitting to bracket
outlet tube alignment.

6. (Note: Your original pump will be mounted in one of two

ways. See Fig. 2 and 3. If it is mounted as shown in
Fig. 2, then follow step 6a for installation. If it is mounted
as shown in Fig. 3, follow step 6b for installation.)

6a. Using petroleum jelly, sparingly lubricate the fuel pump

outlet tube on the bracket and the pump outlet fitting.
With the supplied rubber hose and clamps, slip the
hose and one clamp over the the fuel outlet fitting on
the pump. Invert the sending unit and place the
remaining clamp over the fuel outlet tube. Install the
rubber hose and pump onto the fuel outlet tube on the
bracket. Guide the pump adapter grommet into the
pump support on the bracket. When the pump and
adapter grommet assembly are firmly seated in the
pump support, verify that the rubber hose is seated
against the fuel pump, and then position and tighten
the hose clamps.

6b. Using petroleum jelly, sparingly lubricate the fuel pump

outlet tube on the bracket and the pump outlet fitting.
Install the rubber spacer and pulsator onto the fuel
pump. The spacer and pulsator are to be fully seated
against the pump when properly installed. Invert the
bracket assembly and install the pump and pulsator
assembly onto the fuel outlet tube on the bracket.

©2003 Edelbrock Corporation
Rev. 11/03

Catalog #17933

Brochure #63-0223Page 3 of 4

Guide the pump adapter grommet into the pump
support on the bracket. Firmly seat the pump and
adapter grommet into the pump support. Then
verify that the pulsator and spacer are still fully
seated against the pump.

7. Install the supplied electrical connector to the pump
and to the factory fuel pump wiring harness plug.

8. Install the new fuel filter on the pump in the same
position or orientation as the original filter. To avoid
damage to the filter, place it on a clean, flat surface
and push the pump straight down into the filter cup
until it is fully seated on the pump (See Fig. 5). (Note:

Take care to properly align the filter the first time. If it
has to be removed, the filter will be contaminated or
destroyed by removing it, and a replacement filter will
be needed.)

Fuel Pump

Adapter

Bracket

Filter

Pump Inlet

Filter Cup

Flat Surface

Fig. 5

BRACKET INSTALLATION

1. Inspect the fuel tank for dirt and debris. If the amount
of dirt or debris is excessive, clean the fuel tank before
installing the bracket assembly.

2. Inspect the bracket to make sure it is clean and ready
for installation.

3. Place the supplied fuel tank o-ring seal in the groove
at the fuel tank opening. Place the bracket assembly
into the tank using care not to disturb the o-ring seal
or to hang the float assembly on any protrusions in the
tank. Also use care not to fold or twist the filter, as this
could cause restricted fuel flow. Install the locking ring
and rotate it clockwise until it is properly seated
against the stops. Check service manual for an
approved sealant for locking ring.

FUEL TANK INSTALLATION

1. Inspect the condition and location of all tank mounting

pads, insulators and brackets. Defective, missing or
mislocated pads and insulators will cause the
transmission of excessive noise into the vehicle.

2. Inspect and correct any defects in the fuel hoses, filler
neck connections, or similar components related to the
fuel system.

3. Install the fuel tank in the vehicle and tighten the tanks
support strap bolts. Reconnect all lines and hoses and
tighten securely. Connect the electrical connections.
Make certain that all hoses, fittings, and electrical
connections are correctly and securely attached.

4. Be sure that all fuel lines are correctly routed and secured
in any mounting brackets. Make sure the wiring harness
is installed in the original position and secured in any
wire clips or brackets, if present.

WRAP UP

1. Using only equipment approved for use with gasoline,
refill the fuel tank with gasoline. (Note: Always clean

any gasoline spills immediately).

2. Inspect the fuel system for leaks. Repair any leaks before
proceeding.

3. With the ignition switch off, install the fuel pump fuse,
and reconnect the negative (ground) cable to the battery.

4. Turn the ignition key to the “Run” position only. This will
charge the fuel system. You may need to do this a few
times to get pressure. Once you have pressure, check for
any leaks and repair. Then, start engine and re-check for
leaks. (Note: Turn off engine and correct any leaks

before continuing.).

5. Clear any trouble codes in the electronic control unit
(ECU) that may exist as a result of the fuel pump
replacement procedure. Use the factory service manual
for assistance, if necessary.

TROUBLESHOOTING

Should the fuel pump fail to operate:

1. Check the fuel pump fuse and fuel pump relay as outlined

in the factory service manual.

2. If the pump has power and proper polarity, check the

remainder of the fuel system as outlined in the service
manual.

(Note: This pump will not remedy any malfunctions in
the fuel pressure regulator, fuel injectors, or other fuel
system problems).

©2003 Edelbrock Corporation
Rev. 11/03

Edelbrock Corporation • 2700 California St. • Torrance, CA 90503

Technical Toll-Free Hotline: [phone] • Office: [phone]

E-Mail: [e-mail]

Catalog #17933

Brochure #63-0223Page 4 of 4