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Here's another thought... 200 1981

uid 18083's pic
posted by  lucid on  Wed Jun 14 05:04 CST 2006
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

...that might point to a shorted relay (or clear it of suspicion).

Like Mario said, the relay just "relays" +12V from fuse 7 to the input (lest side contact) of fuse 5. From there the +12V goes thru the fuse to the tank pump, and also straight to the Main pump.

My thought is to remove the relay and replace it with a jumper wire from fuse 7 to fuse 5, where the relay (just a controllable jumper) would normally put it anyway. This will run the pumps immediately. If fuse 7 doesn't blow, that says to me that the (absent) relay was at fault.

Note: Even if the pumps run and fuse 7 doesn't blow, I don't think the engine will run. Not well at least. That's because the jumper wire would only power the pumps — but not the Lambda control circuits that regulate fuel delivery to the injectors. For that you'd need a double jumper at the relay harness socket: from #30 (Red) to both #87 (Y/Red) and #87b (Blue) .
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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