I have a 1996 Dakota 4x4,V8,318,and am trying to find out the fuel capacity of the fuel tank without running it out of fuel and refilling it.I have the original owners manual,but it's not in there.

I once held the nerve to run it almost dry. I refilled with 19 gallon.

Pump the tank dry of the fuel using the electric fuel pump, just jump the fuel pump relay to get the pump to run and remove the supply line to the injectors and attach a hose. Use extreme caution around gasoline, no sparks, ground the container to the truck.

The original gas tank on a 1998 F-250 Lariat has a capacity of 30 gallons. Because there is no mention of dual fuel tank capacity available, the 2nd fuel tank was likely added after purchase. You would need to know the capacity of the fuel tank when it was installed. ----------------------------------------------------------------------------------------
Lexia-3

Its located in the fuel tank as part of the fuel pump assembly. U must drop the tank to replace

Fuel pump check valve is leaking causing fuel to drain back into tank..... the fix is a new fuel pump.

ZAS

Do you have spark?
Do you have fuel?
Which are you missing?
TIP.A quick check for spark.........give it a spray of starting fluid....if it runs....you've got spark.
No spark usually means......a bad coil or ignition module on the 3.9.
No fuel is usually caused by a bad fuel pump.

Replace the fuel pump and sender assy

a bad crank sensor or dist pickup plate can cause this.... check the fuses in the fuse block under the hood for any blown ..... a bad auto shut down relay may cause it .....try putting a test light on the green and orange wire and see if it lights up when you try to crank it

You have to remove the fuel tank.