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Fuse 5 gets power (to input/left contact) from the Fuel relay, during cranking and running. True for either LH or K-jet FI systems. 1982 was a transitional year, but you don't say which FI you have. Here is a "canned post" I wrote some time ago that may help you.
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The Tank Pump Fuse can be very useful, if you have a Test Light or Digital Multimeter. Depending on the FI system, the Tank Pump Fuse will be or #4 ('85 Turbo, LH 2.2, 2.4) or #5 (pre-'85 K-jet, LH1.0, LH 2.0)
When looking at the fuses, the unfused or "Hot" side is on the left, as shown below.
Hot (+) side ——<<(FUSE)>>— fused (–) side goes——> to the tank pump
Fuel relay Voltage at the Fuse 5 Hot side also goes DIRECTLY to the Main Pump. This point SHOULD be at +12V whenever the Fuel Relay is energized. (Requires ign. pulses)
At the Tank pump fuse holder, you can:
• Verify Fuel Relay operation. (Look for +12V on Fuse 4/5 input while cranking)
• Test ("hot wire") either Fuel Pump (or both). Get +12V from any fuse 6—10 input contact.
• Use the hot wire as a No-Start diagnostic, or to run pumps for pressure tests, etc.
• Measure each pump's Current "draw" (requires Ammeter, 10 amps max is OK)
• Test and measure the O2 heater resistance (LH 2.4)
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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