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'87 LH2.2 retrofit: non-start question 200

uid 18083's pic
posted by  lucid on  Fri May 11 01:19 CST 2007
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"But I still can't get the fuel pump to run off the ecu. So something isn't triggering it."

The fuel pump doesn't run directly off the ECU. It runs off the Fuel Relay, which gets picked by the ECU when it sees ignition pulses on terminal #1.

Then the ECU makes the ground for the Fuel half of the 2-part Fuel relay. The other half should pick as soon as the key is on, for main power to the AMM and ECU.

• How does your pertronix or coil interface to the ECU?

• Do you get that 1st click of the Fuel relay with Key On?

• The ECU also needs the ignition pulses to time the injectors. Do they get pulsed when cranking (get a noid light on one or more).

• If all that's missing is the Fuel Relay ground from the ECU, the ground can be wired thru a K-jet fuel relay, which picks directly off coil #1 (ground side) pulses. This would maintain the safety aspect of "no spark = no fuel".


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






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