no electrical to 84 mustang gt tb fuel injection fuel pumps

[xroads]

84 mustang gt, 5.0, at, convertible that sat for two yrs. previously running well. attempted to start it today, but no go. no gas getting to tbfi. will run w/gas poured into tb unit. no fuses chk bad in fuse box. no electric to either of the fuel pumps. think there must be another fuse somewhere that's bad, but cannot fine it. did chk the inertia switch, and it is good. where is/are the fuel pump(s) fuse(s) located?
note that this was the first year of fi for mustang.
thanks in advance for the help

[dynodon64]

If it's like any of the later FI cars, there will be a relay. They used to be under the drivers seat or in the engine compartment by the starter solenoid. The fuel injection works off of the ignition system. If it doesn't work neither will the fuel. I also think the EEC relay powers the fuel pump relay. So they both use the same fuse.

[xroads]

so I have an 84 gt, 5.0, at, convertible w/throttle body injection. was running fine, but sat for a couple of years. now, I get spark, but no fuel. it will run if I pour gas in, but I am getting no fuel to the tbi from the fuel pumps. on advice from others, I chk'd the relay and sure enough, power in but not out. p/n on original ford relay is:E3EB934192A, which my ford dealer tells me has been discontinued. note that this is a 4 pin connection. all other auto parts stores show only a 5 pin relay, which doesn't work. anybody have any ideas on how to get this car running? anyone have a good electrical schematic of the fuel system, which I believe is special to the first year tbi.
thanks for any help

[gt4494]

does the 84 have the accident shutoff switch? If so it would be located in the rear quarter panel accessed from the interior of the trunk.

Try the simple stuff before tearing anything apart.

[grabbergreen84]

If it's the relay, junkyard would be a good place to get a genuine OEM Ford piece. You can test it in the yard, with a 9V battery and a continuity meter.
Meanwhile if you feel confident enough, using a jumper wire to connect the two secondary circuit terminals at the relay socket, should allow you to further test the system until a working relay can be procured.

If the problem is no power to the relay socket, then you probably need to look at wiring or fuses or fusible links.

Do you think that the pump might've seized from sitting, and is now overwhelming the circuit with resistance?

[JACook]

No voltage out of the fuel pump relay could mean it's not being energized by the ECU, or the relay coil
may not be receiving voltage.

The relay coil is fed voltage off the ECU power relay, through the inertia switch in the trunk, through the
small red/black hash wire to the relay. The ECU energizes the relay by providing a ground on the small
tan/light green dot wire.

Don't presume the ECU is receiving power, or is functional, because the engine runs when you pour gas
down the throttle body. The ignition system only uses the ECU for timing control, so the engine can fire
even if the ECU is not operational.

If there's no power to the fuel pump relay coil, first thing I would check is the inertia switch, but a close
second would be to make sure the red wire on the ECU power relay is hot when the ignition is on. The
ECU relay coil is fed from the same circuit that provides power to the ignition system.