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High-pressure fuel pump question 200 1991

uid 18083's pic
posted by  lucid on  Mon Jul 25 05:04 CST 2005
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

To "hotwire" the Main pump by itself, remove fuse 4 and jumper from 6 to the LEFT fuse 4 contact. That goes straight to the main pump. (With fuse 4 IN, voltage also goes to tank pump.)

"Does the main pump get power from someplace other than the fuel relay that powers the in-tank pump?"
• No -- what varies is when (under what conditions) the ECU energizes the Fuel relay, which it does by activating the coil ground path (Terminal 86/2).

"Keep in mind, this was only with the key in the 'on' position. Must the engine be cranking before the main pump energizes?"
• Except for the brief "buzz/prime" when Key is first turned on, the ECU requires timing pulses from the Ignition CU. This is for both cranking and running.
(Basic safety: No ignition signal=no fuel pumped.)

Bruce Young

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