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"I then went to my fuse box and disconnected the fuse to my front pump. She idled off of the rear pump."
Fuse 6 misleads many people because on our '85-'88 LH FI 240s it's not wired to anything, despite what the fuse cover label says. It is only used on foreign market 240s that still used K-Jetronic FI up thru 1989 and maybe after.
There is no separate main pump fuse. The entire FI system current comes from the 25Amp blade fuse near the ignition coil. Current from the 25A fuse flows thru the Fuel relay to Fuse 4 for the Tank pump, and on to the Main pump.
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Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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