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High-pressure fuel pump question 200 1991

posted by  Moron on  Sun Jul 31 05:14 CST 2005
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Here's an update and a request for assistance:

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. While the car was running, I checked for voltage at the wires going to the main pump, and did not find any. This seems to point to a problem with the main pump circuit. 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.

A quick summary: 1991 240 no-start due to fuel delivery; Relay engages and runs the in-tank pump with key on; main pump does not energize when engine is cranking, but works fine when 12 volts is delivered directly to it.

Looks like I need to start working backwards from the main pump. Where to next?





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