[falconvan]

I'm putting a 96 4.6 with a 4r70w trans from a Lincoln Town Car into a 59 ford wagon. Engine is mounted and engine harness is hooked up. By running all the battery +, ignition, and ground wires to the EEC v, the engine will crank, fire injectors, and fire the spark plugs but I am not getting the grounding signal from pin 80 on the EEC to the fuel pump relay. If I put a ground jumper on pin 80 it starts the pump, and the engine will start and run.

Is there somewhere I can find a sequence of operation for the fuel pump relay from the EEC or does anyone have an idea what could be holding out the relay coil ground? This EEC does not have PATS; it didn't come out in the Lincoln until 98.

[Jtab]

Shot in the dark here but did you install an inertia switch? That cuts power to the fuel pump. It's the only inline safety i know of.

[pikachu07]

If your 1996 4.6L EEC-V isn’t grounding pin 80 to trigger the fuel pump relay, even though the engine cranks and fires, it's likely missing a key input like constant power to the Keep Alive Memory (KAM), proper ignition power, or a valid Park/Neutral signal from the transmission range sensor (TR). The EEC only grounds pin 80 during key-on (for 1–2 seconds) and while cranking if all necessary inputs are present. Since there's no PATS on this PCM, focus on checking power at KAM (often pin 55), clean grounds, and simulate the TR sensor in "Neutral" if it's not connected

[jfranks]

If your 1996 4.6L EEC-V isn’t grounding pin 80 to trigger the fuel pump relay, even though the engine cranks and fires, it's likely missing a key input like constant power to the Keep Alive Memory (KAM), proper ignition power, or a valid Park/Neutral signal from the transmission range sensor (TR). The EEC only grounds pin 80 during key-on (for 1–2 seconds) and while cranking if all necessary inputs are present. Since there's no PATS on this PCM, focus on checking power at KAM (often pin 55), clean grounds, and simulate the TR sensor in "Neutral" if it's not connected

That makes sense. I didn’t realize the EEC would hold back the ground signal if something like the KAM or TR sensor input wasn’t right. I’ll double-check power at pin 55 and make sure the range sensor is reading neutral. Thanks for pointing me in the right direction.

[Duztin]

That makes sense. I didn’t realize the EEC would hold back the ground signal if something like the KAM or TR sensor input wasn’t right. I’ll double-check power at pin 55 and make sure the range sensor is reading neutralBeautifulideas.in. Thanks for pointing me in the right direction.

@jfranks, did checking the KAM power at Pin 55 actually resolve the issue? I was under the impression that if the TR sensor was off, it wouldn't even let the starter crank, so I'm curious if that actually affects the fuel pump ground on these EEC-V units. Would love to know the outcome before I start wiring mine up

[jfranks]

The fuel pump sequence of operation is an important part of how an engine runs smoothly. When the ignition is turned on, the pump primes the system to build proper fuel pressure,
and then it continues running as the engine operates. Understanding this sequence helps a lot when diagnosing starting or fuel delivery issues.

[stevesmith98]

The fuel pump sequence of operation typically starts when the ignition is switched on, sending power to the pump relay so the pump can prime the fuel system and build pressure. Once the engine begins cranking, the ECU keeps the pump running to maintain steady fuel delivery to the injectors. If the engine stops or no RPM signal is detected, the ECU cuts power to the pump for safety.