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Jumping at the fuse terminals does not energize the main pump. However, applying battery voltage directly to the pump itself will energize the pump, and the car will start and run.
• Voltage must be getting to fuse 4 if the tank pump runs (earlier post), so there must be an open circuit between the fuse 4 input (left contact) and the Main pump.
The diagram shows 2 separate in-line connectors between the fuse contact and the pump. I think one of these is under the rear seat, but don't know about the other.
Get the back seat out (no fun -- you need to push back and then pull up while still pushing), find that y/r wire connector, see if jumpered power is there at the mid-point, and go from there.
I suppose even the push-on terminal at fuse 4, where the power takes off for the pump, could be suspect -- but that should be 2 wires (1 in and 1 out) in a single female terminal, because there are 3 male push-ons for each fuse -- only 1 input and 2 outputs.
When looking at a fuse from the side, with the wires in your right, the bottom-most terminal runs under the fuse to the hot INPUT side (Left fuse contact). The two top terminals connect to the fused OUTPUT side (Right fuse contact).
Does the ignition also get its signal from the crank sensor, like the main pump? I ask, because I'm obviously getting spark. If the ignition does not receive a signal from the crank sensor, then that could definitely be the culprit.
• Only the ignition gets the RPM signal. It then relays a "copy" to the FI ECU to allow fuel system operation. If the engine runs, the RPM sender and ignition are OK. I'd say you've isolated your problem to a single circuit path.
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Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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