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Potentially dangerous hack around an ECU problem 700 1990

uid 18083's pic
posted by  lucid on  Sun Aug 29 05:51 CST 2010
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

Must be 86-2 (no 88 terminal), and done to compensate for a known ECU problem. The ECU is supposed to ground that 86-2 terminal when it knows the Ignition system is working. This controlled ground is what normally energizes the Fuel relay.

Right now your Fuel pump will run as soon (and as long as) the Key is on. And it could keep on running in case of an accident, like upside down in a ditch with driver unconscious.

The Bosch circuit intent was to prevent pumping fuel to a dead engine, as a safety precaution.

--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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