I have a 87 plymouth voyager Le with a 3.0 engine ( not sure if its stock or not )

Is it possible the pump is running but not pumping any fuel ?
Are you sure you have fuel in the tank ?
Is the pump worn out ?
Did you disconnect the line at the engine to see if you have any flow ?
And are the injectors working ?

1. • 1 Make sure the engine is completely cool. Relieve the pressure in the fuel system. Disconnect the negative battery cable. Elevate the vehicle and support the fuel tank with a jack.
     
   • 2 Disconnect the fuel line from the front of the tank. Remove the ground strap, the inboard side fuel tank straps and the front T-strap fastener, then lower the tank approximately six inches.
     
   • 3 Take the fuel lines from the fuel pump module. Plug the fuel lines with golf tees to prevent the spillage of gasoline. Remove the fuel filter.
     
   • 4 Install the new fuel filter. Set the bolts in place and torque them to 40 inch/pounds. Tighten the main tank straps to 40 foot/pounds and the T-strap to 250 inch lbs.
     
   • 5 Reconnect the fuel lines in the reverse order of their removal. Lower the vehicle. Connect the negative battery cable.
     
   • 6 Start the engine and let it run for several minutes. Inspect the fuel lines for any leaks.
     

Read more: How to Replace a Fuel Filter in a Plymouth Voyager ' eHow.com http://www.ehow.com/how_4519932_replace-fuel-filter-plymouth-voyager.html#ixzz1WBXAZ7d3

We will need more information from you. But you could check to be sure you have gas and that the gas is getting to the engine. For example, is the fuel pump working? Are there any leaks in the fuel line? Is the Gas Filter Plugged? You could also check to see if you are getting Spark at the plugs. Perhaps when you put everything back together from replaceing the waterpump or fuel pump you missed something. Remeber the basics. You need Fuel, Spark and Air for your engine to run. Track it down and be sure you have all 3

From under the car you can reach up in the back to gain acces to the spark plugs. Its difficult without a lift, but it can be done.

i would ck timing & replace spark plugs any way,,still should ck fuel pressure,,at fuel rail,,,

The fuel pump in a Plymouth Voyager is electric so you should check the fuses and relays before inspecting the fuel pump itself. If you have fuel in your tank but your vehicle has difficulty getting fuel, you may need to clean your fuel pump or replace it entirely. The Plymouth Voyager comes in a variety of styles and this may affect your choice of fuel pump.
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Things You'll Need:

• Fuel pump kit
• Socket wrench set
• Torque wrench

1. Step 1 Determine the fuel pump that your Plymouth Voyager will require. This depends on the make and model and engine size of your vehicle. Models manufactured from 1991 to 1995 came with a 2.5 L K, 3.0 L Mitsubishi 6G72, 3.3L EGA or 3.8 L EGH engine. Models made after 1995 may have a 2.4 L EDZ, 3.0 L Mitsubishi 6G72, 3.3 L EGA or 3.8 L EGH engine.
   
2. Step 2 Relieve the fuel system pressure and drain the fuel tank. Disconnect the negative battery cable with a socket wrench.
   
3. Step 3 Support the fuel tank and loosen the strap bolts with a socket wrench. Remove the fuel line and electrical harness for the fuel pump.
   
4. Step 4 Lower the fuel tank so that you can remove the lock ring for the fuel pump. This will allow you to remove the fuel pump.
   
5. Step 5 Install the new fuel pump using the items included in the kit. Use a torque wrench to tighten the lock ring and bolts for the main fuel tank straps to 40 ft. lbs. Torque the bolts on the T strap for the fuel tank to 250 in. lbs.
   
6. Step 6 Complete the installation by reversing the removal procedure.
   

What you have the cap and rotor.could be bad use good one.

Check primary voltage at ignition coil and fuel injectors, engine cranking, use a test lite, dark green wire with orange tracer. If no voltage, that comes from asd relay. Some makes and models if the computer doesn't see the cam and crank sensor signals, the computer won't ground the relay.
You need to do some testing.

if u were low on gas i would look towards fuel pump check for fuel pressure and check engine for spark

check fuel filter