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For more information about fuel pumps theory, improving fuel pumps accuracy, and calibration techniques, see the
Swisor Auto Parts Technical Reference Manual.

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Reference Manual



Reference Section--Fuel Pump Electrical Connections

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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