Have a 94 4.0 ranger and in the morning it starts and runs fine. Maybe a little bit of rough idle for a second but then it's good. Today I was leaving work and it was good and all of the sudden after parking for a few minutes on an incline it would not start. Finally got it to start and it didnt want to idle at all. I featherd it and it started to clear up a little bit. I would hit the gas and get no response and it would just stall out. Changed the fuel filter this past weekend because this has been happening more and more. Was thinking and told a fuel pump. Any other suggestions?

 

Also checked codes and it is throwing the fuel pump secondary circuit code.. If that helps.

 

Yes reads like fuel pump issue, you could check voltage at fuel pump but if is above 11volts, should be battery voltage, then problem is in the tank.

 

Thanks. Just didn't want to replace a pump and it be an electrical issue

 

Well you could try replacing the fuel pump relay($7) or just swap it with the WOT relay, same part number.

And see if things get better.

It is in the engine bay fuse box

 

I did that and nothing changed. I noticed that the problem seems to exist when the tank goes below 1/4 tank 80% of the time

 

Then you probably have a hole in the fuel line in the tank, low fuel level lets more fuel out and sucks some air in.