Diagram of 1984-89 EFI in-tank fuel pump assembly

Low-Pressure In-Tank Fuel Pump for '84-89 EFIs
The large (~3") mounting plate shown is for '88-89
IF THE IMAGE IS TOO SMALL, click it.

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The pre-'87 fuel level sender operates through a range of 10.5 Ohms (full) to 72.8 Ohms (empty).
The '87-up sender is 160 Ohms (full) to 16 Ohms (empty).

The fuel pump is a motor with an impeller assembly, much like an oil pump, so it will allow fuel to leak backward into the tank when it's not running. This behavior is VITAL to the operation of the dual-function reservoir. Inexpensive aftermarket solenoid-stlye fuel pumps do not allow fuel to leak backward, and so inhibit the DFR. To use one or more solenoid pumps, replace the DFR with a SFR and this style of valve:

Owner caption September 2007 · Photo 2038 of 5000