No Fuel

[DJschick88]

Dodge Omni GLH-T i can't get fuel to the engine. Any suggestions?

[mwrenn]

Check fuel pump fuse, fuel filter for obstruction, then as a last resort, the in tank fuel pump.

[Kevin]

Can you give anymore details? Does the pump prime when you cycle the key on? When you turn the key on the pump should prime for a second and then shut back off. If you put a multimeter on the pump wiring you should have 12v. 12v and no priming noise is a problem with the pump or the wiring in the tank.

Do you have spark? If you're not getting spark either, you're probably not hearing the pump prime. Both of them receive power from the ASD relay. Check and see if this is getting power. If it's not getting power TO the ASD relay, there may be a problem with the engine control module. SBEC I think in your case, but I'm not sure which computer is in the Omni.

If you're getting power to the ASD relay but not out of this is probably your problem...

But a few more details wouldn't hurt.

[NAJ]

To check ASD Relay function locate the underhood diagnostic connector.It is in the harness near the power module.With the key on ground the DB/YL wire,this will activate the ASD relay,you should hear the fuel pump run, and have 12 volts at the + coil and at the DG/BK wire at the injector harness.If you have power at the coil and injector harness and the pump is not running be sure there is 12 volts at the DG/BK wire at the fuel pump,if not the wire to the pump is open.If there is 12 volts at the pump check the ground wire.If the ground and power feed are good and the pump does not run replace the pump.If there is power present at all 3 spots and the pump is running the ASD circuit is good.You will need to connect a fuel pressure gauge to the fuel rail to be sure the pump is actually pumping fuel.Disconnect your jumper from the DB/YL wire and turn the key off before connecting the gauge,after the gauge is connected ground the DB/YL wire again and read fuel pressure.53-57 psi.If pressure is good disconnect your jumper and check for power at the + coil while cranking the engine for 10 seconds,if there is no power present during cranking you have a problem in the HEP circuit or the dist is not turning due to a broken timing belt.
The ASD will not be activated during cranking if the controller does not see a crank signal.

[DJschick88]

ok well all this sounds very good but i cant quite understand all the abreviations. I have just reciently started on the car and this is what the person who i bought it from told me. I know it might be painful to explain further but if you guys could that would be awesome. Also if you all know of any performance upgrades that go well with the car please let me know.

[NAJ]

ASD Relay = Automatic Shutdown Relay.
This relay is used to power high draw devices such as the Fuel Pump,Fuel Injectors,Ignition Coil and the Heated Oxygen Sensor.
When you first turn the key on the controller will activte the ASD for 1 second to cycle the fuel pump and prime the fuel rail.After this the controller will not activate the ASD again until it sees a crank signal from the HEP.
The ASD Relay on 83-87 vehicles is part of the engine controller.
HEP = Hall Effect Pickup, this is located in the distributor and is used by the engine controller for RPM (Revolutions Per Minute, Engine Speed) information and on a Turbo Vehicle there are 2 connectors they other is used by the controller to syncronize the fuel injectors.The MPFI (Multi-Port Fuel Injection) vehicles fire the injectors in groups of 2 and the controller needs to know where #1 cylinder is for this reason.
PM = Power Module,this is one of the controllers used on 83-87 vehicles and is located under the hood next to the battery.
LM = Logic Module,this is the other controller used on 83-87 vehicles and is located behind the right side kick panel inside the vehicle.
In 1988 Chrysler combinded the 2 controllers into 1 housing and it is located under the hood next to the battery.It is called a SMEC, Single Module Engine Controller.
The underhood diagnostic connector is used to connect a scan tool so that it can communicate with the engine controller.It is located in the wiring harness near the engine controller. It is black and has 5 terminals.
PSI = Pounds Per Square Inch
" HG = Inch's of Mercury, a measurement of lack of pressure, vacuum. If you have 18 inch's of engine vacuum it will be listed as 18"HG
+ = Positive
- = Negative
Wire Colors are abbreviated and the abbreviations are universal and used by all manufacturers. If a wire color is listed with only 1 color the wire is a solid color.
If it is listed with a / that means the wire has 2 colors,the primary color of the wire which will be listed first and a tracer, a smaller line of color that runs down the length of the wire will be listed second.Sometimes due to age and dirt the wire colors may be difficult to see,use a small amount of rubbing alcohol to clean an exposed section of the wire to make it easier to identify.
In the colors listed previously they are ;
DB/YL = Dark Blue (primary color) with a Yellow tracer.
DG/BK = Dark Green (primary color) with a Black tracer
Hope all this clears things up a bit and makes it easier to understand.
Any other questions feel free to ask.

[DJschick88]

thanks a lot for all the info i'll go take a look at all that this weekend. You will proubably be hearing from me later. Thanks again!

[devlish]

i've been having the same problem... 85glht, no spark or fuel pump prime. swapped in a KNOWN GOOD pm so the asd is not the problem. checked for power at all the critical points on the J2 (db/yl) and it's all there. rechecked all the grounds, espsecially the fuel rail and injector grounds, all are good. i have the proper 5.x volts on the wires from the hep. everything tests fine inside on the LM as well. continuity everywhere, same 8.x volts on the orange wire at the LM. the ignition wires are putting out a solid 12.x volts. all grounds in the LM seem to be fine, verified by multimeter, and the lightbulb trick.

still no spark and no fuel pump prime.

however, if i unplug the blue harness from the LM, the fuel pump will prime with the key on, still no spark though.

also tried two different LMs that have both previously run this car!

any thoughts?