Electric fuel pumps
can fail for many reasons, but the most common is low- voltage
or no voltage. Anything that prevents electric current at sufficient
voltage from reaching the pump will stop it. Corroded, loose or
broken wiring is a major cause of electric pump failure. Even though
it's okay, the pump won't run until the wiring problem is identified
and repaired. A bad relay, inertia switch, oil-pressure sender
or engine-control module, or simply a bad ground--all can make
a good fuel pump act bad.
Continuing fuel pump design changes by
vehicle manufacturers and part number consolidations by aftermarket
suppliers require careful attention to the servicing of in-tank
fuel pumps.
Our engineering and manufacturing objective is 100%
OE performance, look and fit--including electrical connections.
However, some pumps in the distribution system may require electrical
connector modifications--particularly those for General Motors
vehicles. All parts and instruction sheets are included with the
pumps. The procedure is as follows.
Replacing push-on terminals with Metri-Pack? terminals. If
the OE pump has push-on terminals and its replacement has Metri-Pack
terminals, the hanger assembly must be rewired. Four wires with
the correct connectors are supplied with the new pump, but only
those matching the wires on the OE hanger assembly are needed.
Positive (+) Wire. Remove the positive pump
wire from its terminal on the sender assembly cover, and match
it to one of the gray replacement wires. Connect the appropriate
gray wire to the positive (+) terminal on the sender assembly cover
and into the positive (+) terminal on the black plastic connector.
Some applications use a wire lock in the terminal connector. Remove
it by squeezing the locking tabs on both sides and lifting the
wire lock out of the terminal.
Ground (-) Wire. Remove the black ground wire
connector from the ground (-) terminal on the old pump, and match
it with correct black ground wire supplied with new pump. Connect
it as follows:
1.If the old black ground wire connects to the fuel-level
sender assembly, connect the proper terminal of the new black ground
wire there.
2.If the old black ground wire is welded to the tube,
cut the terminal from its free end,but do not cut the wire too
short!The old wire cannot be removed, so you'll solder
the new wire to the old. Cut the new ground wire to fit. Strip
insulation from each wire end and solder them together using resin
solder. Do not tape the solder joint; fuel will dissolve the tape
joint.
3.Connect the appropriate terminal of the black
ground wire to the negative (-) terminal of the new pump. Be sure
the replacement wires do not interfere with float arm movement
at any point.
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