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Sorry Josh, I didn't mean +12v straight from the battery. I had mentioned using Fuse 6 in an earlier post and assumed too much, forgetting how it was in the beginning for all of us.
Jumpering fuse 6 to fuse 4 is a handy, and fairly common, way to run the pumps. Fuses 6 thru 10 are always "hot" (+12v present) on what I call the "Input" side. That's the contact being fed from the Battery, some fed all the time (i.e. 6 — 10), others only when the Key is ON (1 — 3), or when a switch or relay is active (15 & 16).
The "Output" (Right side) fuse contact leads to the "fused" (protected) device(s). For fuse 4, that's the Tank Pump. Voltage at Fuse 4's Input (Left side) contact comes from the (energized) Fuel Injection (aka Fuel Pump) relay.
So when we put +12v to the Input of fuse 4, its just like it came from the FI relay Output—and goes to the same places, like the Main Pump.
And by removing fuse 4, we can choose which pump to run—
Left/Input contact = Main Pump
Right/Output contact = Tank Pump
Let me know if you have any questions,
Bruce
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Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted only 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67
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