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Re: no start,no fuel
Check the fuel pump relay, sometimes you can switch the relay for the a/c compressor with the fuel pump relay (usually they are the same type relay) and see if the fuel pump turns on, ifthis still does't work, then i would suggest trying another fuel pump (thisone may be defective, it happens). Hope this helps.
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If the fuel pump/s continue to run with key on, suspect a relay issue. The relay is grounded by the vehicles computer. If the computer supplies a constant ground, the relay will continue to stay closed and power the fuel pumps constantly. If the the ground wire that comes from the computer to the relay is shorted/grounded, the relay will stay energized as well. As for the no start, are the injectors getting a power and ground supply? The ground side of the injector is controlled by the computer as well. Is the vehicle getting spark at the coil/plug? Have you scanned the computer for any trouble codes?
There isn't one on a Plymouth. In the Power Distribution Center is the fuel pump relay, and 2 pertinent fuses: Fuse #8 is a 20 amp fuse, hot at all times, and is the power feed for the pump relay. Fuse #10 is a 10 amp fuse, and is hot in run or start, and is the feed to the coil side of the relay. So hold your finger lightly on the relay while someone cycles the key from off to on. If the wiring at the relay is good, you should feel the relay click. If you don't feel anything from the relay, first check fuse #10. If the fuses are good, but nothing from the relay, you will have to look into the wiring for the relay. There is the power feed from fuse #8, the feed out to the fuel pump, the coil feed in from fuse #10, and the ground wire out from the coil side which goes into the PCM.
Do you have a test light? If not, go buy a cheap $5 test light-one with a lead to clip to a ground, and with a needle type probe. Pull the fuel pump relay out of the terminals it is plugged into-you need to check if the power feed for the pump is still available at the relay. Clip the test light lead to a ground and touch the test probe to the positive battery post-to check that your ground is good- tester should light up. Now touch the probe to all of the terminals that the relay plugs into. One terminal should have power with key off. If no terminals have power, you have lost the power feed for the pump. Double check all your maxi fuses in the power distribution box. Either a maxi fuse or a fusible link will be the power feed for the fuel pump relay. If the power feed is there at the relay, try a new relay. If still no pump, a shop will probably have to check your fuel pump circuit. Did you check for power at the fuel tank while the key was held in crank? When the engine is cranking, the fuel pump wire should have power. When the key is turned to on, the fuel pump should have power for about 2 seconds, to pressurize the fuel system. Then when key is turned to crank or start, the fuel pump should stay on.
the oil pressure sensor has a 3rd wire which feeds to the fuel pump .. If you turn the ignition key on and do not hear the fuel pump running for 5 seconds, replace that oil pressure sensor. That sensor does turn the fuel pump circuit off once oil pressure is acheive and the the computer switches the fuel pum relay on to take over running the fuel pump
if you have someone try to start the car while you hit the gas tank in the centre of the fuel tank and it starts then the fuel pump is no good.note this doesn`t always work due to how bad the pump is seized.if you look for the fuel pump feed wire under the hood,its a green wire with a black plastic connector and with some one again trying to start the car and with a test light connected to the connector it should light up.if it does then the pump is no good.another way is to have someone listen at the fuel tank and feed power to this same wire if the pump is working then they should hear the pump run,they may have to listen at the filler neck with the gas cap off to see if they can hear it run.
computer doesnt control pump relay on such a old vehicle ,you have a fuse out or old dirty connections on the base of the relay so if all else fails then run a new feed wire to relay depending on which power point on relay has no power ,if its the feed from ignition to operate relay make a new feed from ignition switch and if no power to pump side of relay then run a new feed to this via a fuse .simple to sort out on such an old vehicle
The fuel pump relay is at fault. The engine will start running off the oil pressure sensor for the 3rd wire connected to the sensor feeds power to the fuel pump which makes your truck start right up. When the engine achomplish the standard oil pressure as needed the sensor shuts power off by the PCM default system and turns on the fuel pump relay to continue working the fuel pump. replace the relay and you will be driving around again
sounds to me like your fuel pump relay is still bad happens all the time with even the newest of parts and/ or you might want to take the wires off of the pump and clean them really good road grime seems to find its way into even the tightest places especially if you replaced it once you broke the factory seal....
If you do not have power on the GRAY wire at the fuel pump......... switch the fuel relay with a same type good relay in the relay box and check for power again. REMEMBER ...YOU WILL ONLY HAVE POWER 2 OR 3 SECONDS AT PUMP AFTER KEY IS TURNED TO RUN POSITION......after key has been off for 10 seconds.(or when there is oil pressure) If no power in the gray wire at this point and you have checked ALL fuses in engine compartment and on right (pass ) side of dash panel facing pass door.......add your own jumper to supply power to system at fuel pump fuse and test again.........if power at pump now....install a permanent jumper (SWITCHED POWER....OFF WITH KEY) at fuse box......if still no power check all connections between fuse box and pump.....or run new power feed wire to pump gray wire and disconnect old.