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Wiring a 'prime' button to the EFI relay without nuking the ECU

posted by  B.B. on  Fri Dec 22 00:12 CST 2023
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last visit: Mon Oct 6 13:15 CST 2014
[RELATED]

Hi Will,

Did you rewire the Regina to B230FT (MFI) specs?

If you wired the same as the B230FT MFI
Yes, grounding 86/2 of the Fuel relay would run the pumps.
You would run both pumps and the O2 heater and apply a ground to pin 20 of the fuel ECU. That's uncharted territory, Signal ground is not chassis ground.

Safer would be to apply 12 V direct to the battery side of Fuse 11
and you would run both pumps without grounding ECU pin 20.
To be safe your jumper should have a 15 amp fuse.
You'll need a husky push button switch.

Have you measured current at Fuse 1 and Fuse 11 to gauge the health of the
pumps?

Here's what I get:
Fuse 1 = 10.5A Both pumps,O2 sensor, AMM, PTC, both ECU's, RSR coil, IAC.

Fuse 11 = 3.5A Only the in-tank pump

I can pull fuse 11 and start and run the engine.

Disclaimer: Do these mods at your own risk

Good luck and happy holidays, Bill






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