My '83 245 B23F will not ground the fuel pumps. Can the ICU cause this or is this a bad ECU problem only. All grounds test good at the ECU and the spare ECU I have does the same. I guess I could have two faulty ECUs. The wire from terminal 1 on the coil to terminal 1 on the ECU test good with a multimeter. I have cleaned all fuses and the fuse block. All wires are in good shape after a detailed inspection, also has a new hall effect sensor. Please help I am running out of money.

In addition to Don's suggestions, try jumpering the Fuel Relay coil ground terminal (#85,BL/GN wire) straight to ground. If it runs that way, something is still wrong in that Ignition Coil #1 to ECU#1...ECU #18 to relay #85 path.

Also check and clean the 25 AMP fuse (main power source), and Fuse 12 to Fuel Relay #86 (coil + side) and also ECU pin 18.

BTW, you probably know this by now, but the Fuel Relay is the one on the Right.
--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Now gone)
'83 Turbo 245
'73 142 (98K)
'71 144 (track modified--and still here)
New 144 from '67 to '78
Used '62 122 from '63 to '67

The '83 and '84 FI system detects spark (at the coil primary) and completes the ground connection for the fuel pump relay. Your car has two relays -- both are the metal-cased style, mounted on the inside firewall, passenger side just above where the upper knee pad attaches to the firewall.

One relay is for the FI system, the other for the pumps. They're identical and can be interchganged. These relays are generally troublefree.

If you have no spark, the relay will NOT pull in. No spark means no fuel.

You can force the pumps to run by jumping fuse 5 to 7. If the car starts and runs this way, then you most likely do have trouble in the relay circuit.

Overall, those FI ecus are not known for trouble.
--
Don Foster (near Cape Cod, MA)

Is this a LH fuel system. I think there is a fuel pump relay somewhere.

I replaced the relays, pumps, pressure regulator, and the AMM. Pumps used to cut out while driving but now don't even prime in the key on position much less while cranking. I believe I have also lost spark.