1992gt400hp

a couple days ago my fuel pump just stopped working... no big deal i figured, its been in the car since it was new. i replaced it with a new one and nothing... i then looked at the relay and found some bullsh*t. the relay was not there, just a wire. some asswipe had straight wired my pump. i put a relay in the place and it works when you first turn the ignition on and the car will crank up. but after about 2 minutes of running, it just dies. after that the relay will not cut the pump on until you unplug it and plug it back in... WTF MAN???

Derf00

There should be more than one wire running to a relay. (4 at least) if there is and your description was a typo, it's possible you have the wires backwards. A relay will usually have an ignition switch/control side and a load side. Theignition/control side is only meant tohave a very low amperage run through it to keepload sidecircuit closed andallow the load side to have the needed power running to the pump.

If you have the load side hooked up to the ignition/control switch side instead of the load side, it may work for a few seconds but as soon as the relay overheats, it will pop the circuit back open.

There's usually a diagram on aftermarket relays like the one I found on google below

RELAY OPERATION
All relays operate using the same basic principle. Our example will use a commonly used 4 - pin relay. Relays have two circuits: A control circuit (shown in GREEN) and a load circuit (shown in RED). The control circuit has a small control coil while the load circuit has a switch. The coil controls the operation of the switch.

pastfast125

Yes, on the relay you should have a keyed on power source from the ignition, an always hot 12, lead to the pump, and a ground. When you turn the keyed on source to ON, it sends the Always Hot power straight to the pump.

1992gt400hp

i should probably try sayin that again... instead of a relay, there is a jumper wire from the keyed hot wire to the pump wire slot. i got a new relay from ford and thats when im running into the problems. the relay overheats quickly, i thought it may be bad so i got another... same ol same ol. help!!

mjr46

you need a wiring diagram to see if it's wire correctly or if you have a short on the b+ wire or high resistance in a wire or connection causing excessive current draw

1992gt400hp

if all else fails is it possible to run a whole new set of wires?? new Battery positive, new Keyed hot, New ground, And wire into the fuel pump wire??

mjr46

you could but the way your wiring is now is that it recieves a signal from the ecm to power up the fuel pump when the pip signal is recieved from the ecm via the tfi module that the engine is cranking.....that's why the pump powers up and shuts off after 2 sec cause if the pip/crank signal is not seen from the dizzy then the ecm unpowers the pump...otherwise if you wire it to switched 12volts the pump will run as soon as the car is switched on...unless you wired it up to a oil pressure switch so as soon as oil pressure is seen it'll power the pump on and work in connection with the relay..best way is find the prob and fix it

1992gt400hp

i gotcha. i work on mechanical probs all the time, but hardly ever an electrical prob. how do i start to diagnose y my relay is getting hot and popping off? i hate to sound stupid but i honestly hardly ever do electrical

mjr46

first inspect all wiring for pecker tracks...which means look for where the pecker has been before and modded wiring.....if none is seen ....you'll need a wiring diagram and have to have a multimeter handy to check for shorts to ground on the b+ side of the circuit and or high resistance by looking for voltage drops across connections and or bad grounds that'll cause excessive current draw

1992gt400hp

10-4 thx man